Patent Application
20240164200
This application claims priority to and benefits of Korean Patent Application No. 10-2022-0134454 under 35 U.S.C. § 119, filed on Oct. 18, 2022, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.
Embodiments relate to an organometallic compound, a composition and light-emitting device including the same, and an electronic apparatus including the light-emitting device.
A light-emitting device may include a first electrode, a hole transport region, an emission layer, an electron transport region, and a second electrode, which are sequentially arranged. Holes injected from the first electrode may move toward the emission layer through the hole transport region. Electrons injected from the second electrode may move toward the emission layer through an electron injection layer of the electron transport region. Carriers, such as the holes and electrons, may recombine in the emission layer to produce excitons. The excitons may transition from an excited state to a ground state, thus generating light.
It is to be understood that this background of the technology section is, in part, intended to provide useful background for understanding the technology. However, this background of the technology section may also include ideas, concepts, or recognitions that were not part of what was known or appreciated by those skilled in the pertinent art prior to a corresponding effective filing date of the subject matter disclosed herein.
Embodiments include an organometallic compound with improved color purity, color conversion efficiency, and lifespan, a composition including the organometallic compound, a light-emitting device including the organometallic compound, and an electronic apparatus including the light-emitting device.
Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the embodiments of the disclosure.
According to embodiments, a composition may include:
In Formula 1,
In Formula 3,
According to embodiments, a light-emitting device may include a first electrode; a second electrode facing the first electrode; an interlayer between the first electrode and the second electrode and including an emission layer; and an organometallic compound represented by Formula 1, which is explained herein.
In an embodiment, the light-emitting device may further include:
In an embodiment, the second compound may include a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, or a combination thereof; and the fourth compound may include at least one cyclic group including boron (B) and nitrogen (N) as ring-forming atoms.
In an embodiment, the emission layer may include: the organometallic compound; and the second compound, the third compound, the fourth compound, or any combination thereof, and
In an embodiment, the light-emitting device may further include the second compound and the third compound, wherein at least one of the second compound and the third compound may each independently include at least one deuterium, at least one silicon, or any combination thereof.
According to embodiments, an electronic apparatus may include the light-emitting device.
According to embodiments, an electronic device may include the light-emitting device.
In an embodiment, the electronic device may be a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, an indoor light, an outdoor light, a signal light, a head-up display, a fully transparent display, a partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a mobile phone, a tablet personal computer, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a three-dimensional (3D) display, a virtual reality display, an augmented reality display, a vehicle, a video wall including multiple displays tiled together, a theater screen, a stadium screen, a phototherapy device, or a signboard.
According to embodiments, an organometallic compound may be represented by Formula 1, which is explained herein.
In an embodiment, CY1, CY2, CY31 to CY34, and CY4 may each independently be a benzene group, a naphthalene group, a phenanthrene group, an anthracene group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, an imidazopyridine group, an imidazopyrazine group, an imidazopyridazine group, an oxepine group, an azepine group, a cyclopentene group, a cyclohexene group, a cycloheptene group, or a cyclooctene group.
In an embodiment, L32 and L34 may each independently be *—C(Z3)═C(Z4)—*′, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a.
In an embodiment, b32 may be 1, and L32 may be a benzene group, a naphthalene group, or a phenanthrene group, each unsubstituted or substituted with at least one R10a; or
In an embodiment, at least one of L32 and L34 may each independently be a group represented by Formula 4, which is explained below.
In an embodiment, L33 may be a single bond.
In an embodiment, in Formula 1, a moiety represented by
may be a moiety represented by one of Formulae 1-1 to 1-4, which are explained below.
In an embodiment, the organometallic compound may include a 7-membered ring.
In an embodiment, CY32, (L32)b32, CY33, and N may form a 7-membered ring; or
In an embodiment, in Formula 1 a moiety represented by
may be a moiety represented by one of Formulae 1-A to 1-F, which are explained below.
In an embodiment, the organometallic compound may be one of Compounds 1 to 111, which are explained below.
It is to be understood that the embodiments above are described in a generic and explanatory sense only and not for the purpose of limitation, and the disclosure is not limited to the embodiments described above.
The above and other aspects and features of the disclosure will be more apparent by describing in detail embodiments thereof with reference to the accompanying drawings, in which:
The disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. This disclosure may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the drawings, the sizes, thicknesses, ratios, and dimensions of the elements may be exaggerated for ease of description and for clarity. Like numbers refer to like elements throughout.
In the description, it will be understood that when an element (or region, layer, part, etc.) is referred to as being “on”, “connected to”, or “coupled to” another element, it can be directly on, connected to, or coupled to the other element, or one or more intervening elements may be present therebetween. In a similar sense, when an element (or region, layer, part, etc.) is described as “covering” another element, it can directly cover the other element, or one or more intervening elements may be present therebetween.
In the description, when an element is “directly on,” “directly connected to,” or “directly coupled to” another element, there are no intervening elements present. For example, “directly on” may mean that two layers or two elements are disposed without an additional element such as an adhesion element therebetween.
As used herein, the expressions used in the singular such as “a,” “an,” and “the,” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. For example, “A and/or B” may be understood to mean “A, B, or A and B.” The terms “and” and “or” may be used in the conjunctive or disjunctive sense and may be understood to be equivalent to “and/or”.
In the specification and the claims, the term “at least one of” is intended to include the meaning of “at least one selected from the group consisting of” for the purpose of its meaning and interpretation. For example, “at least one of A, B, and C” may be understood to mean A only, B only, C only, or any combination of two or more of A, B, and C, such as ABC, ACC, BC, or CC. When preceding a list of elements, the term, “at least one of,” modifies the entire list of elements and does not modify the individual elements of the list.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Thus, a first element could be termed a second element without departing from the teachings of the disclosure. Similarly, a second element could be termed a first element, without departing from the scope of the disclosure.
The spatially relative terms “below”, “beneath”, “lower”, “above”, “upper”, or the like, may be used herein for ease of description to describe the relations between one element or component and another element or component as illustrated in the drawings. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, in the case where a device illustrated in the drawing is turned over, the device positioned “below” or “beneath” another device may be placed “above” another device. Accordingly, the illustrative term “below” may include both the lower and upper positions. The device may also be oriented in other directions and thus the spatially relative terms may be interpreted differently depending on the orientations.
The terms “about” or “approximately” as used herein is inclusive of the stated value and means within an acceptable range of deviation for the recited value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the recited quantity (i.e., the limitations of the measurement system). For example, “about” may mean within one or more standard deviations, or within ±20%, ±10%, or ±5% of the stated value.
It should be understood that the terms “comprises,” “comprising,” “includes,” “including,” “have,” “having,” “contains,” “containing,” and the like are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof in the disclosure, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Unless otherwise defined or implied herein, all terms (including technical and scientific terms) used have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and should not be interpreted in an ideal or excessively formal sense unless clearly defined in the specification.
According to embodiments, a composition may include:
In Formula 1,
In Formula 3,
As used herein, the expression “CY32 and CY33 may not be linked via (L32)b32” may be understood by referring to Compound 1.
As used herein, the expression “CY33 and CY34 may not be linked via (L33)b33” may be understood by referring to Compound 109.
In an embodiment, the composition may be included in a layer that includes: the organometallic compound; and the second compound, the third compound, the fourth compound, or any combination thereof. The layer including the composition may include a mixture that includes: the organometallic compound; and the second compound, the third compound, the fourth compound, or any combination thereof. For example, the layer including the composition may include the organometallic compound and the second compound, may include the organometallic compound and the third compound, may include the organometallic compound and the fourth compound, may include the organometallic compound, the second compound, and the third compound, may include the organometallic compound, the second compound, and the fourth compound, may include the organometallic compound, the third compound, and the fourth compound, or may include the organometallic compound, the second compound, the third compound, and the fourth compound. Therefore, the layer including the composition is clearly differentiated from, for example, a double layer that includes: a first layer including the organometallic compound; and a second layer including the second compound, the third compound, the fourth compound, or a combination thereof.
In an embodiment, the composition may be a composition that is prepared to form a layer that includes: the organometallic compound; and the second compound, the third compound, the fourth compound, or any combination thereof by using various methods, such as a deposition method and a wet process. In an embodiment, the composition may be a pre-mixed mixture prepared for use in a deposition method (for example, a vacuum deposition method). The pre-mixed mixture may be charged, for example, into a deposition source within a vacuum chamber, and two or more compounds included in the pre-mixed mixture may be co-deposited.
In an embodiment, a light-emitting device may include:
Because the light-emitting device includes the organometallic compound represented by Formula 1, the light-emitting device may have improved color purity, color conversion efficiency, and lifespan characteristics.
In an embodiment, the interlayer in the light-emitting device may include the organometallic compound. In an embodiment, the emission layer in the light-emitting device may include the organometallic compound.
In an embodiment, an amount of the organometallic compound may be in a range of about 1 part by weight to about 20 parts by weight, based on a total of 100 parts by weight of the emission layer. For example, an amount of the organometallic compound may be in a range of about 10 parts by weight to about 15 parts by weight, based on a total of 100 parts by weight of the emission layer.
In an embodiment, the light-emitting device may further include a second compound including at least one π electron-deficient nitrogen-containing C1-C60 heterocyclic group, a third compound including a group represented by Formula 3, a fourth compound capable of emitting delayed fluorescence (for example, a delayed fluorescence compound), or any combination thereof,
In an embodiment, the organometallic compound, the second compound, the third compound, and the fourth compound may each independently include at least one deuterium.
In an embodiment, the organometallic compound, the second compound, the third compound, and the fourth compound may each independently include at least one silicon.
In an embodiment, the composition and the light-emitting device may each further include the second compound in addition to the organometallic compound, and the second compound may include at least one deuterium, at least one silicon, or any combination thereof.
In an embodiment, the composition and the light-emitting device may each further include the third compound in addition to the organometallic compound, and the third compound may include at least one deuterium, at least one silicon, or any combination thereof.
In an embodiment, the composition and the light-emitting device may each further include the fourth compound in addition to the organometallic compound, and the fourth compound may include at least one deuterium, at least one silicon, or any combination thereof. For example, the fourth compound may serve to improve color purity, color conversion efficiency, and lifespan characteristics of the light-emitting device.
In an embodiment, the composition and the light-emitting device may each further include the second compound and the third compound in addition to the organometallic compound, and at least one of the second compound and the third compound may each independently include at least one deuterium, at least one silicon, or any combination thereof. The second compound and the third compound may form an exciplex.
In an embodiment, the composition and the light-emitting device may each further include the second compound, the third compound, and the fourth compound in addition to the organometallic compound, and at least one of the second compound, the third compound, and the fourth compound may each independently include at least one deuterium, at least one silicon, or any combination thereof.
In an embodiment, a highest occupied molecular orbital (HOMO) energy level of the organometallic compound may be in a range of about −5.35 eV to about −5.15 eV. For example, a HOMO energy level of the organometallic compound may be in a range of about −5.30 eV to about −5.20 eV.
In an embodiment, a lowest unoccupied molecular orbital (LUMO) energy level of the organometallic compound may be in a range of about −2.20 eV to about −1.80 eV. For example, a LUMO energy level of the organometallic compound may be in a range of about −2.15 eV to about −1.90 eV.
The HOMO and LUMO energy levels may each be evaluated via cyclic voltammetry analysis (for example, Evaluation Example 1) of the organometallic compound.
In an embodiment, a maximum emission wavelength (or an emission peak wavelength) of an emission spectrum in a film including the organometallic compound may be in a range of about 430 nm to about 475 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 440 nm to about 475 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 450 nm to about 475 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 430 nm to about 470 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 440 nm to about 470 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 450 nm to about 470 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 430 nm to about 465 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 440 nm to about 465 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 450 nm to about 465 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 430 nm to about 460 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 440 nm to about 460 nm. For example, a maximum emission wavelength of an emission spectrum in a film including the organometallic compound may be in a range of about 450 nm to about 460 nm.
In an embodiment, a full width at half maximum (FWHM) of an emission spectrum of the organometallic compound may be equal to or less than about 45 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 5 nm to about 45 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 10 nm to about 45 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 15 nm to about 45 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 20 nm to about 44 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 5 nm to about 44 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 10 nm to about 43 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 15 nm to about 43 nm. For example, a FWHM of an emission spectrum of the organometallic compound may be in a range of about 20 nm to about 43 nm.
In an embodiment, a photoluminescence quantum yield (PLQY) of the organometallic compound may be in a range of about 90% to about 99%. For example, a PLQY of the organometallic compound may be in a range of about 90% to about 97%.
In an embodiment, a decay time of the organometallic compound may be in a range of about 2.40 μs to about 3.5 μs. For example, a decay time of the organometallic compound may be in a range of about 2.40 μs to about 3.0 μs. a decay time of the organometallic compound may be in a range of about 2.40 μs to about 2.7 μs.
The maximum emission wavelength, FWHM, PLQY, and decay time of the organometallic compound are evaluated with respect to the film including the organometallic compound.
In an embodiment, the emission layer of the light-emitting device may include: the organometallic compound; and the second compound, the third compound, the fourth compound, or any combination thereof, and the emission layer may emit blue light.
In an embodiment, a maximum emission wavelength of the blue light may be in a range of about 430 nm to about 475 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 440 nm to about 475 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 450 nm to about 475 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 430 nm to about 470 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 440 nm to about 470 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 450 nm to about 470 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 430 nm to about 465 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 440 nm to about 465 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 450 nm to about 465 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 430 nm to about 465 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 440 nm to about 465 nm. For example, a maximum emission wavelength of the blue light may be in a range of about 450 nm to about 465 nm.
In an embodiment, the emission FWHM of the blue light may be equal to or less than about 45 nm. For example, the emission FWHM of the blue light may be in a range of about 5 nm to about 45 nm. For example, the emission FWHM of the blue light may be in a range of about 10 nm to about 45 nm. For example, the emission FWHM of the blue light may be in a range of about 15 nm to about 45 nm. For example, the emission FWHM of the blue light may be in a range of about 20 nm to about 44 nm. For example, the emission FWHM of the blue light may be in a range of about 5 nm to about 44 nm. For example, the emission FWHM of the blue light may be in a range of about 10 nm to about 43 nm. For example, the emission FWHM of the blue light may be in a range of about 15 nm to about 43 nm. For example, the emission FWHM of the blue light may be in a range of about 20 nm to about 43 nm.
In an embodiment, the blue light may be deep blue light.
In an embodiment, a CIEx coordinate (for example, a bottom emission CIEx coordinate) of the blue light may be in a range of about 0.125 to about 0.140. For example, a CIEx coordinate of the blue light may be in a range of about 0.130 to about 0.140.
In an embodiment, a CIEy coordinate (for example, a bottom emission CIEy coordinate) of the blue light may be in a range of about 0.110 to about 0.200. For example, a CIEy coordinate of the blue light may be in a range of about 0.115 to about 0.160.
Examples of the maximum emission wavelength and the CIEx and CIEy coordinates of the blue light may be as described in Table 5.
In an embodiment, the second compound may include a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, or any combination thereof.
In an embodiment, the second compound may include a compound represented by Formula 2:
In Formula 2,
In an embodiment, the second compound may include a carbazole group or a dibenzofuran group, and may be substituted with at least four deuterium atoms.
In an embodiment, the third compound may not be CBP or mCBP:
In an embodiment, the third compound may include a compound represented by Formula 3-1, a compound represented by Formula 3-2, a compound represented by Formula 3-3, a compound represented by Formula 3-4, a compound represented by Formula 3-5, or any combination thereof:
In Formulae 3-1 to 3-5,
In an embodiment, a difference between a triplet energy level (eV) of the fourth compound and a singlet energy level (eV) of the fourth compound may be in a range of about 0 eV to about 0.5 eV. For example, a difference between a triplet energy level of the fourth compound and a singlet energy level of the fourth compound may be in a range of about 0 eV to about 0.3 eV.
In an embodiment, the fourth compound may include at least one cyclic group including boron (B) and nitrogen (N) as a ring-forming atom. In an embodiment, the fourth compound may be a C8-C60 polycyclic group-containing compound including at least two condensed cyclic groups that share a boron atom (B).
In an embodiment, the fourth compound may include a condensed ring in which at least one third ring may be condensed with at least one fourth ring,
In an embodiment, the fourth compound may include a compound represented by Formula 502, a compound represented by Formula 503, or any combination thereof:
In Formulae 502 and 503,
In the specification, R51 to R56, R71 to R74, R81 to R85, R82a, R82b, R83a, R83b, R84a, R84b, R500a, R500b, R501 to R508, R505a, R505b, R506a, R506b, R507a, R507b, R508a, and R508b may each independently be hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C1-C60 alkyl group unsubstituted or substituted with at least one R10a, a C2-C60 alkenyl group unsubstituted or substituted with at least one R10a, a C2-C60 alkynyl group unsubstituted or substituted with at least one R10a, a C1-C60 alkoxy group unsubstituted or substituted with at least one R10a, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a, a C6-C60 aryloxy group unsubstituted or substituted with at least one R10a, a C6-C60 arylthio group unsubstituted or substituted with at least one R10a, —C(Q1)(Q2)(Q3), —Si(Q1)(Q2)(Q3), —N(Q1)(Q2), —B(Q1)(Q2), —C(═O)(Q1), —S(═O)2(Q1), or —P(═O)(Q1)(Q2). Q1 to Q3 are each the same as described in the specification.
In an embodiment, the light-emitting device may satisfy at least one of Conditions 1 to 4:
[Condition 1]
[Condition 2]
[Condition 3]
[Condition 4]
The highest occupied molecular orbital (HOMO) energy level and the lowest unoccupied molecular orbital (LUMO) energy level of the organometallic compound, the second compound, and the third compound may each be a negative value. The HOMO energy levels and LUMO energy levels may each be measured according to a method of the related art, for example, a method described in Evaluation Example 1.
In an embodiment, an absolute value of a difference between a LUMO energy level of the organometallic compound and a LUMO energy level of the second compound may be in a range of about 0.1 eV to about 1.0 eV; an absolute value of a difference between a LUMO energy level of the organometallic compound and a LUMO energy level of the third compound may be in a range of about 0.1 eV to about 1.0 eV; an absolute value of a difference between a HOMO energy level of the organometallic compound and a HOMO energy level of the second compound may be equal to or less than about 1.25 eV (for example, in a range of about 0.2 eV to about 1.25 eV); and an absolute value of a difference between a HOMO energy level of the organometallic compound and a HOMO energy level of the third compound may be equal to or less than about 1.25 eV (for example, in a range of about 0.2 eV to about 1.25 eV).
When the relationships between LUMO energy level and HOMO energy level satisfy the conditions as described above, a balance between holes and electrons injected into the emission layer can be achieved.
The light-emitting device may have a structure of a first embodiment or a second embodiment.
According to a first embodiment, the organometallic compound may be included in an emission layer in the interlayer of the light-emitting device, wherein the emission layer may further include a host, the organometallic compound may be different from the host, and the emission layer may emit phosphorescence or fluorescence emitted from the organometallic compound. For example, according to the first embodiment, the organometallic compound may be a dopant or an emitter. In an embodiment, the organometallic compound may be a phosphorescent dopant or a phosphorescent emitter. Phosphorescence or fluorescence emitted from the organometallic compound may be blue light.
The emission layer may further include an auxiliary dopant. The auxiliary dopant may improve luminescence efficiency from the organometallic compound by effectively transferring energy to the organometallic compound, which may be a dopant or an emitter. The auxiliary dopant may be different from the organometallic compound and the host.
In embodiments, the auxiliary dopant may be a delayed fluorescence-emitting compound. The auxiliary dopant may be a compound including at least one cyclic group including boron (B) and nitrogen (N) as ring-forming atoms. For example, the auxiliary dopant in the first embodiment may include the fourth compound represented by Formula 502 or Formula 503.
According to a second embodiment, the organometallic compound may be included in an emission layer in the interlayer of the light-emitting device, wherein the emission layer may further include a host and a dopant, the organometallic compound, the host, and the dopant may be different from one another, and the emission layer may emit phosphorescence or fluorescence (e.g., delayed fluorescence) from the dopant.
In an embodiment, the organometallic compound in the second embodiment may serve as an auxiliary dopant that transfers energy to a dopant (or an emitter), and may not serve as a dopant.
In an embodiment, the organometallic compound in the second embodiment may serve as an emitter and as an auxiliary dopant that transfers energy to a dopant (or an emitter).
For example, phosphorescence or fluorescence emitted from the dopant (or the emitter) in the second embodiment may be blue phosphorescence or blue fluorescence (e.g., blue delayed fluorescence).
The dopant (or the emitter) in the second embodiment may be a phosphorescent dopant material (e.g., an organometallic compound represented by Formula 1, an organometallic compound represented by Formula 401, or any combination thereof) or any fluorescent dopant material (e.g., a compound represented by Formula 501, a compound represented by Formula 502, a compound represented by Formula 503, or any combination thereof).
In the first embodiment and the second embodiment, the blue light may have a maximum emission wavelength in a range of about 390 nm to about 500 nm. For example, the blue light may have a maximum emission wavelength in a range of about 410 nm to about 490 nm. For example, the blue light may have a maximum emission wavelength in a range of about 430 nm to about 480 nm. For example, the blue light may have a maximum emission wavelength in a range of about 440 nm to about 475 nm. For example, the blue light may have a maximum emission wavelength in a range of about 455 nm to about 470 nm.
The host in the first embodiment and in the second embodiment may be any host material (e.g., a compound represented by Formula 301, a compound represented by 301-1, a compound represented by Formula 301-2, or any combination thereof).
In an embodiment, the host in the first embodiment and in the second embodiment may each independently be the second compound, the third compound, or any combination thereof.
In an embodiment, the light-emitting device may further include a capping layer outside the first electrode and/or outside the second electrode.
In an embodiment, the light-emitting device may further include at least one of a first capping layer outside the first electrode and a second capping layer outside the second electrode, and at least one of the first capping layer and the second capping layer may each independently include an organometallic compound represented by Formula 1. Further details on the first capping layer and/or second capping layer are as described herein.
In an embodiment, the light-emitting device may further include:
The expression “(interlayer and/or capping layer) includes an organometallic compound” as used herein may be understood as “(interlayer and/or capping layer) including an organometallic compound represented by Formula 1, or including two or more different organometallic compounds, each independently represented by Formula 1”.
For example, an interlayer and/or a capping layer may include Compound 1 only as the organometallic compound. In this regard, Compound 1 may be present in the emission layer of the light-emitting device. In embodiments, the emission layer may include, as the organometallic compound, Compound 1 and Compound 2. In this regard, Compound 1 and Compound 2 may be present in a same layer (for example, Compound 1 and Compound 2 may both be present in an emission layer), or may be present in different layers (for example, Compound 1 may be present in an emission layer, and Compound 2 may be present in an electron transport region).
The term “interlayer” as used herein refers to a single layer and/or all layers between a first electrode and a second electrode of a light-emitting device.
Another aspect provides an electronic apparatus including the light-emitting device. The electronic apparatus may further include a thin-film transistor. For example, the electronic apparatus may further include a thin-film transistor including a source electrode and a drain electrode, wherein the first electrode of the light-emitting device may be electrically connected to the source electrode or the drain electrode. In an embodiment, the electronic apparatus may further include a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof. Further details on the electronic apparatus are the same as provided herein.
Embodiments provide an electronic device which may include the light-emitting device.
In an embodiment, the electronic device may be a flat panel display, a curved display, a computer monitor, a medical monitor, a television (TV), a billboard, an indoor light, an outdoor light, a signal light, a head-up display, a fully transparent display, a partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a mobile phone, a tablet personal computer, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a three-dimensional (3D) display, a virtual reality display, an augmented reality display, a vehicle, a video wall including multiple displays tiled together, a theater screen, a stadium screen, a phototherapy device, or a signboard.
Embodiments provide an organometallic compound which may be represented by Formula 1. The detailed description of Formula 1 is as described herein.
Methods of synthesizing the organometallic compound may be readily understood to those of ordinary skill in the art by referring to the Synthesis Examples and/or the Examples described herein.
[Description of Formula 1]
In Formula 1, M may be platinum (Pt), palladium (Pd), cobalt (Co), gold (Au), nickel (Ni), silver (Ag), or copper (Cu).
In an embodiment, M may be Pt.
In Formula 1, X1 to X4 may each independently be C or N.
In an embodiment, X1 may be C. In an embodiment, X1 in Formula 1 may be C, and C may be a carbon of a carbene moiety.
In an embodiment, X1 in Formula 1 may be N.
In an embodiment, X2 and X3 may each be C, and X4 may be N.
In Formula 1, a bond between X1 and M may be a coordinate bond; one of a bond between X2 and M, a bond between X3 and M, and a bond between X4 and M may be a coordinate bond, and the remainder thereof remainder thereof (the remainder of a bond between X2 and M, a bond between X3 and M, and a bond between X4 and M) may each be a covalent bond.
In an embodiment, a bond between X2 and M and a bond between X3 and M may each be a covalent bond, and a bond between X4 and M may be a coordinate bond.
In an embodiment, X4 may be N, and a bond between X4 and M may be a coordinate bond.
In Formula 1, ring CY1 to ring CY5 may each independently be a C3-C60 carbocyclic group or a C1-C60 heterocyclic group.
For example, ring CY1 may be a nitrogen-containing C1-C60 heterocyclic group.
In an embodiment, in Formula 1, ring CY1 may be an X1-containing 5-membered ring; an X1-containing 5-membered ring in which at least one 6-membered ring is condensed; or an X1-containing 6-membered ring. For example, ring CY1 may include a 5-membered ring that is bonded to M in Formula 1 via X1. In an embodiment, the X1-containing 5-membered ring may be a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, or a thiadiazole group. In an embodiment, the 6-membered ring or the X1-containing 6-membered ring that is condensed to the X1-containing 5-membered ring may each independently be a benzene group, a pyridine group, or a pyrimidine group.
In an embodiment, ring CY1 may be an X1-containing 5-membered ring, and the X1-containing 5-membered ring may be an imidazole group or a triazole group.
In an embodiment, ring CY1 may be a X1-containing 5-membered ring to which at least one 6-membered ring is condensed, and the X1-containing 5-membered ring to which at least one 6-membered ring is condensed may be a benzimidazole group or an imidazopyridine group.
In an embodiment, ring CY1 may be an imidazole group, a triazole group, a benzimidazole group, a naphthoimidazole group, or an imidazopyridine group.
In an embodiment, X1 may be C, and ring CY1 may be an imidazole group, a triazole group, a benzimidazole group, a naphthoimidazole group, or an imidazopyridine group.
In an embodiment, ring CY2 may be a benzene group, a pyridine group, a pyrimidine group, a naphthalene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, a fluorene group, a dibenzosilole group, a naphthobenzofuran group, a naphthobenzothiophene group, a benzocarbazole group, a benzofluorene group, a naphthobenzosilole group, a dinaphthofuran group, a dinaphthothiophene group, a dibenzocarbazole group, a dibenzofluorene group, a dinaphthosilole group, an azadibenzofuran group, an azadibenzothiophene group, an azacarbazole group, an azafluorene group, an azadibenzosilole group, an azanaphthobenzofuran group, an azanaphthobenzothiophene group, an azabenzocarbazole group, an azabenzofluorene group, an azanaphthobenzosilole group, an azadinaphthofuran group, an azadinaphthothiophene group, an azadibenzocarbazole group, an azadibenzofluorene group, or an azadinaphthosilole group.
In an embodiment, ring CY2 may be a benzene group, a pyridine group, a pyrimidine group, a naphthalene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, a fluorene group, or a dibenzosilole group.
In an embodiment, in Formula 1, ring CY31 may be a C2-C8 monocyclic group or a C4-C20 polycyclic group in which two or three C2-C8 monocyclic groups are condensed with each other.
For example, in Formula 1, ring CY31 may be a C4-C6 monocyclic group or a C4-C8 polycyclic group in which two or three C4-C6 monocyclic groups are condensed with each other.
The C2-C8 monocyclic group as described herein may be a non-condensed cyclic group, for example, a cyclopentadiene group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a cycloheptadiene group, or a cyclooctadiene group.
For example, ring CY31 may be a benzene group, a pyridine group, a pyrimidine group, a naphthalene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, a fluorene group, a dibenzosilole group, an azadibenzofuran group, an azadibenzothiophene group, an azacarbazole group, an azafluorene group, or an azadibenzosilole group.
In an embodiment, CY1, CY2, CY31 to CY34, and CY4 may each independently be a benzene group, a naphthalene group, a phenanthrene group, an anthracene group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, an imidazopyridine group, an imidazopyrazine group, an imidazopyridazine group, an oxepine group, an azepine group, a cyclopentene group, a cyclohexene group, a cycloheptene group, or a cyclooctene group.
In Formula 1, L1 to L3 and L33 may each independently be a single bond, *—N(Z1)—*′, *—B(Z1)—*′, *—P(Z1)—*′, *—C(Z1)(Z2)—*′, *—C(Z1)═C(Z2)—*′, *—Si(Z1)(Z2)—*′, *—Ge(Z1)(Z2)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*′, or *—C(═S)—*′. Z1 and Z2 are each as described herein. Z1 and Z2 may optionally be linked to each other to form a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a.
In an embodiment, L1, L3, and L33 may each be a single bond.
In an embodiment, L33 may be a single bond.
In an embodiment, L2 may be a single bond, *—N(Z1)—*′, *—B(Z1)—*′, *—P(Z1)—*′, *—C(Z1)(Z2)—*′, *—Si(Z1)(Z2)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*′, or *—C(═S)—*′.
For example, Z1 and Z2 may each independently be:
In Formula 1, L32 and L34 may each independently be a single bond, *—N(Z3)—*′ *—B(Z3)—*′, *—P(Z3)—*′, *—C(Z3)(Z4)—*′, *—C(Z3)═C(Z4)—*′, *—Si(Z3)(Z4)—*′, *—Ge(Z3)(Z4)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)2—*′, or *—C(═S)—*′, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a. Z3 and Z4 are each as described herein. Z3 and Z4 may optionally be linked to each other to form a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a.
In an embodiment, L32 and L34 may each independently be *—C(Z3)═C(Z4)—*′, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a.
In an embodiment, at least one of L32 and L34 may each independently be *—C(Z3)═C(Z4)—*′, Z3 and Z4 may each independently be hydrogen, deuterium, —F, —Cl, a cyano group, a C1-C60 alkyl group unsubstituted or substituted with at least one R10a, a C2-C60 alkenyl group unsubstituted or substituted with at least one R10a, a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a, or a C1-C60 heterocyclic group unsubstituted or substituted with at least one R10a, and Z3 and Z4 may be linked to each other to form a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a.
For example, Z3 and Z4 may each independently be:
In an embodiment, at least one of L32 and L34 may each independently be a C3-C60 carbocyclic group unsubstituted or substituted with at least one R10a. For example, at least one of L32 and L34 may each independently be a benzene group unsubstituted or substituted with at least one R10a.
In an embodiment, b32 may be 1, and L32 may be a benzene group, a naphthalene group, or a phenanthrene group, each unsubstituted or substituted with at least one R10a; or
In an embodiment, at least one of L32 and L34 is a group represented by Formula 4:
In Formula 4,
In an embodiment, in Formula 1, a moiety represented by
may be a moiety represented by one of Formulae 1-1 to 1-4:
In Formulae 1-1 to 1-4,
In an embodiment, in Formula 1, a moiety represented by
may be a moiety represented by one of Formulae 1-A to 1-F:
In Formulae 1-A to 1-F,
The descriptions of Formula 1 may be applied to Formulae 1-1 to 1-4 and 1-A to 1-F.
In an embodiment, the organometallic compound may include a 7-membered ring. The 7-membered ring may be as described for Formulae 1-A to 1-F or Compounds 1 to 109.
In an embodiment, in the organometallic compound,
In Formula 1, the term “CY32, (L32)b32, CY33, and N form a 7-membered ring” may be as described for Formulae 1-A, 1-C, and 1-E.
In Formula 1, the term “CY32, (L34)b34, CY34, and N form a 7-membered ring” may be as described for Formulae 1-B, 1-D, and 1-F.
In an embodiment, in Formula 1, a moiety represented by may be a moiety represented by one of Formulae CY1-1 to CY1-42:
In Formulae CY1-1 to CY1-42,
In an embodiment, in Formulae CY1-1 to CY1-8, X1 may be C; and in Formulae CY1-9 to CY1-42, X1 may be N.
In an embodiment, in Formula 1, a moiety represented by may be a moiety represented by one of Formulae CY2-1 to CY2-11:
In Formulae CY2-1 to CY2-11,
In an embodiment, in Formula 1, a moiety represented by may be a moiety represented by one of Formulae CY2(1) to CY2(26):
In Formulae CY2(1) to CY2(26),
Because an organometallic compound represented by Formula 1 in which N(CY33)(CY34) is substituted into ring CY32 has excellent electric characteristics, a light-emitting device including the organometallic compound may have improved color purity, color conversion efficiency, and lifespan. Rigidity of the organometallic compound may be improved because rings CY32 and CY33 are linked to each other and/or rings CY32 and CY34 are linked to each other. A driving voltage of a light-emitting device including the organometallic compound may be improved because the organometallic compound may include an additional aryl amine structure in a HOMO portion.
In an embodiment, the organometallic compound may be one of Compounds 1 to 111:
In an embodiment, the second compound may be one of Compounds ETH1 to ETH100:
In an embodiment, the third compound may be one of Compounds HTH1 to HTH40:
In an embodiment, the fourth compound may be one of Compounds DFD1 to DFD29:
In the above compounds, Ph indicates a phenyl group, and D indicates deuterium. For example, a group represented by
may be identical to a group represented by
[Description of
Hereinafter, the structure of the light-emitting device 10 according to an embodiment and a method of manufacturing the light-emitting device 10 will be described with reference to
[First Electrode 110]
In
The first electrode 110 may be formed by depositing or sputtering a material for forming the first electrode 110 on the substrate. When the first electrode 110 is an anode, a material for forming the first electrode 110 may be a high work function material to facilitate the injection of holes.
The first electrode 110 may be a reflective electrode, a semi-transmissive electrode, or a transmissive electrode. When the first electrode 110 is a transmissive electrode, a material for forming the first electrode 110 may include indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO2), zinc oxide (ZnO), or any combination thereof. When the first electrode 110 is a semi-transmissive electrode or a reflective electrode, a material for forming the first electrode 110 may include magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), magnesium-silver (Mg—Ag), or any combination thereof.
The first electrode 110 may have a structure consisting of a single layer, or a structure including multiple layers. For example, the first electrode 110 may have a three-layered structure of ITO/Ag/ITO.
[Interlayer]
The interlayer may be located on the first electrode 110. The interlayer may include an emission layer 130.
The interlayer may further include a hole transport region 120 between the first electrode 110 and the emission layer 130, and an electron transport region 140 between the emission layer 130 and the second electrode 150.
The interlayer may further include, in addition to various organic materials, a metal-containing compound such as an organometallic compound, an inorganic material such as quantum dots, or the like.
The interlayer may include two or more emitting units stacked between the first electrode 110 and the second electrode 150, and at least one charge generation layer between the two or more emitting units. When the interlayer includes the two or more emitting units and the at least one charge generation layer as described above, the light-emitting device 10 may be a tandem light-emitting device.
[Hole Transport Region 120]
The hole transport region 120 may have a structure consisting of a layer consisting of a single material; a structure consisting of a layer including different materials; or a structure including multiple layers including different materials.
The hole transport region 120 may include a hole injection layer, a hole transport layer, an emission auxiliary layer, an electron blocking layer, or any combination thereof.
In embodiments, the hole transport region 120 may have a multi-layered structure including a hole injection layer/hole transport layer structure, a hole injection layer/hole transport layer/emission auxiliary layer structure, a hole injection layer/emission auxiliary layer structure, a hole transport layer/emission auxiliary layer structure, or a hole injection layer/hole transport layer/electron blocking layer structure, wherein the layers of each structure may be stacked from the first electrode 110 in its respective stated order, but the structure of the hole transport region 120 is not limited thereto.
The hole transport region 120 may include a compound represented by Formula 201, a compound represented by Formula 202, or any combination thereof:
In Formulae 201 and 202,
In embodiments, the compound represented by Formula 201 and the compound represented by Formula 202 may each independently include at least one of groups represented by Formulae CY201 to CY217:
In Formulae CY201 to CY217, R10b and R10c may each independently be as described for R10a, ring CY201 to ring CY204 may each independently be a C3-C20 carbocyclic group or a C1-C20 heterocyclic group, and at least one hydrogen in Formulae CY201 to CY217 may be unsubstituted or substituted with R10a as described above.
In an embodiment, in Formulae CY201 to CY217, ring CY201 to ring CY204 may each independently be a benzene group, a naphthalene group, a phenanthrene group, or an anthracene group.
In embodiments, the compound represented by Formula 201 and the compound represented by Formula 202 may each independently include at least one of groups represented by Formulae CY201 to CY203.
In embodiments, the compound represented by Formula 201 may include at least one of groups represented by Formulae CY201 to CY203 and at least one of groups represented by Formulae CY204 to CY217.
In embodiments, in Formula 201, xa1 may be 1, R201 may be a group represented by one of Formulae CY201 to CY203, xa2 may be 0, and R202 may be a group represented by one of Formulae CY204 to CY207.
In embodiments, the compound represented by Formula 201 and the compound represented by Formula 202 may each not include a group represented by one of Formulae CY201 to CY203.
In embodiments, the compound represented by Formula 201 and the compound represented by Formula 202 may each not include a group represented by one of Formulae CY201 to CY203, and may each independently include at least one of groups represented by Formulae CY204 to CY217.
In embodiments, the compound represented by Formula 201 and the compound represented by Formula 202 may each not include a group represented by one of Formulae CY201 to CY217.
In an embodiment, the hole transport region 120 may include one of Compounds HT1 to HT46, m-MTDATA, TDATA, 2-TNATA, NPB (NPD), β-NPB, TPD, Spiro-TPD, Spiro-NPB, methylated NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA), polyaniline/dodecylbenzenesulfonic acid (PAN I/DBSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (PANT/CSA), polyaniline/poly(4-styrenesulfonate) (PANI/PSS), or any combination thereof:
A thickness of the hole transport region 120 may be in a range of about 50 Å to about 10,000 Å. For example, the thickness of the hole transport region 120 may be in a range of about 100 Å to about 4,000 Å. When the hole transport region 120 includes a hole injection layer, a hole transport layer, or any combination thereof, a thickness of the hole injection layer may be in a range of about 100 Å to about 9,000 Å, and a thickness of the hole transport layer may be in a range of about 50 Å to about 2,000 Å. For example, the thickness of the hole injection layer may be in a range of about 100 Å to about 1,000 Å. For example, the thickness of the hole transport layer may be in a range of about 100 Å to about 1,500 Å. When the thicknesses of the hole transport region 120, the hole injection layer, and the hole transport layer are within these ranges, satisfactory hole transporting characteristics may be obtained without a substantial increase in driving voltage.
The emission auxiliary layer may compensate for an optical resonance distance according to a wavelength of light emitted from the emission layer, and thus, light emission efficiency of the light-emitting device may be improved. The electron blocking layer may prevent electron leakage from the emission layer to the hole transport region. Materials that may be included in the hole transport region 120 may be included in the emission auxiliary layer and the electron blocking layer.
[p-Dopant]
The hole transport region 120 may further include, in addition to the materials as described above, a charge-generation material for the improvement of conductive characteristics. The charge-generation material may be uniformly or non-uniformly dispersed in the hole transport region (for example, in the form of a single layer consisting of a charge-generation material).
The charge-generation material may be, for example, a p-dopant.
In an embodiment, a lowest unoccupied molecular orbital (LUMO) energy level of the p-dopant may be equal to or less than about −3.5 eV.
In embodiments, the p-dopant may include a quinone derivative, a cyano group-containing compound, a compound including element EL1 and element EL2, or any combination thereof.
Examples of a quinone derivative may include TCNQ, F4-TCNQ, etc.
Examples of a cyano group-containing compound may include HAT-CN and a compound represented by Formula 221:
In Formula 221,
In the compound including element EL1 and element EL2, element EL1 may be a metal, a metalloid, or any combination thereof, and element EL2 may be a non-metal, a metalloid, or any combination thereof.
Examples of a metal may include: an alkali metal (for example, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), etc.); an alkaline earth metal (for example, beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), etc.); a transition metal (for example, titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), etc.); a post-transition metal (for example, zinc (Zn), indium (In), tin (Sn), etc.); and a lanthanide metal (for example, lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), etc.).
Examples of a metalloid may include silicon (Si), antimony (Sb), and tellurium (Te).
Examples of a non-metal may include oxygen (O) and a halogen (for example, F, Cl, Br, I, etc.).
Examples of a compound including element EL1 and element EL2 may include a metal oxide, a metal halide (for example, a metal fluoride, a metal chloride, a metal bromide, or a metal iodide), a metalloid halide (for example, a metalloid fluoride, a metalloid chloride, a metalloid bromide, or a metalloid iodide), a metal telluride, or any combination thereof.
Examples of a metal oxide may include a tungsten oxide (e.g., WO, W2O3, WO2, WO3, or W2O5), a vanadium oxide (e.g., VO, V2O3, VO2, or V2O5), a molybdenum oxide (e.g., MoO, Mo2O3, MoO2, MoO3, or Mo2O5), and a rhenium oxide (e.g., ReO3).
Examples of a metal halide may include an alkali metal halide, an alkaline earth metal halide, a transition metal halide, a post-transition metal halide, and a lanthanide metal halide.
Examples of an alkali metal halide may include LiF, NaF, KF, RbF, CsF, LiCl, NaCl, KCl, RbCl, CsCl, LiBr, NaBr, KBr, RbBr, CsBr, LiI, NaI, KI, RbI, and CsI.
Examples of an alkaline earth metal halide may include BeF2, MgF2, CaF2, SrF2, BaF2, BeCl2, MgCl2, CaCl2, SrCl2, BaCl2, BeBr2, MgBr2, CaBr2, SrBr2, BaBr2, BeI2, MgI2, CaI2, SrI2, and BaI2.
Examples of a transition metal halide may include a titanium halide (for example, TiF4, TiCl4, TiBr4, TiI4, etc.), a zirconium halide (for example, ZrF4, ZrCl4, ZrBr4, ZrI4, etc.), a hafnium halide (for example, HfF4, HfCl4, HfBr4, HfI4, etc.), a vanadium halide (for example, VF3, VCl3, VBr3, VI3, etc.), a niobium halide (for example, NbF3, NbCl3, NbBr3, NbI3, etc.), a tantalum halide (for example, TaF3, TaCl3, TaBr3, TaI3, etc.), a chromium halide (for example, CrF3, CrCl3, CrBr3, CrI3, etc.), a molybdenum halide (for example, MoF3, MoCl3, MoBr3, MoI3, etc.), a tungsten halide (for example, WF3, WCI3, WBr3, WI3, etc.), a manganese halide (for example, MnF2, MnCl2, MnBr2, MnI2, etc.), a technetium halide (for example, TcF2, TcCl2, TcBr2, TcI2, etc.), a rhenium halide (for example, ReF2, ReCl2, ReBr2, ReI2, etc.), an iron halide (for example, FeF2, FeCl2, FeBr2, FeI2, etc.), a ruthenium halide (for example, RuF2, RuCl2, RuBr2, Rule, etc.), an osmium halide (for example, OsF2, OsCl2, OsBr2, OsI2, etc.), a cobalt halide (for example, CoF2, CoCl2, CoBr2, CoI2, etc.), a rhodium halide (for example, RhF2, RhCl2, RhBr2, RhI2, etc.), an iridium halide (for example, IrF2, IrCl2, IrBr2, IrI2, etc.), a nickel halide (for example, NiF2, NiCl2, NiBr2, NiI2, etc.), a palladium halide (for example, PdF2, PdCl2, PdBr2, PdI2, etc.), a platinum halide (for example, PtF2, PtCl2, PtBr2, PtI2, etc.), a copper halide (for example, CuF, CuCl, CuBr, Cul, etc.), a silver halide (for example, AgF, AgCl, AgBr, AgI, etc.), and a gold halide (for example, AuF, AuCl, AuBr, AuI, etc.).
Examples of a post-transition metal halide may include a zinc halide (for example, ZnF2, ZnCl2, ZnBr2, ZnI2, and the like), an indium halide (for example, I nI3, etc.), a tin halide (for example, SnI2, and the like), and the like.
Examples of a lanthanide metal halide may include YbF, YbF2, YbF3, SmF3, YbCl, YbCl2, YbCl3 SmCl3, YbBr, YbBr2, YbBr3, SmBr3, YbI, YbI2, YbI3, SmI3, and the like.
Examples of a metalloid halide may include an antimony halide (for example, SbCl5, etc.).
Examples of a metal telluride may include an alkali metal telluride (for example, Li2Te, Na2Te, K2Te, Rb2Te, Cs2Te, etc.), an alkaline earth metal telluride (for example, BeTe, MgTe, CaTe, SrTe, BaTe, etc.), a transition metal telluride (for example, TiTe2, ZrTe2, HfTe2, V2Te3, Nb2Te3, Ta2Te3, Cr2Te3, Mo2Te3, W2Te3, MnTe, TcTe, ReTe, FeTe, RuTe, OsTe, CoTe, RhTe, IrTe, NiTe, PdTe, PtTe, Cu2Te, CuTe, Ag2Te, AgTe, Au2Te, etc.), a post-transition metal telluride (for example, ZnTe, etc.), and a lanthanide metal telluride (for example, LaTe, CeTe, PrTe, NdTe, PmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, etc.).
[Emission Layer 130]
When the light-emitting device 10 is a full-color light-emitting device, the emission layer 130 may be patterned into a red emission layer, a green emission layer, and/or a blue emission layer, according to a subpixel. In embodiments, the emission layer 130 may have a stacked structure of two or more layers of a red emission layer, a green emission layer, and a blue emission layer, in which the two or more layers may contact each other or may be separated from each other to emit white light. In embodiments, the emission layer 130 may include two or more materials of a red light-emitting material, a green light-emitting material, and a blue light-emitting material, in which the two or more materials are mixed with each other in a single layer to emit white light.
The emission layer 130 may include a host and a dopant. The dopant may include a phosphorescent dopant, a fluorescent dopant, or any combination thereof.
An amount of the dopant in the emission layer 130 may be in a range of about 0.01 parts by weight to about 15 parts by weight, based on 100 parts by weight of the host.
In embodiments, the emission layer 130 may include a quantum dot.
In embodiments, the emission layer 130 may include a delayed fluorescence material. The delayed fluorescence material may serve as a host or as a dopant in the emission layer.
A thickness of the emission layer 130 may be in a range of about 100 Å to about 1,000 Å. For example, the thickness of the emission layer 130 may be in a range of about 200 Å to about 600 Å. When the thickness of the emission layer 130 is within any of these ranges, excellent light-emission characteristics may be obtained without a substantial increase in driving voltage.
[Host]
In embodiments, the host may include a compound represented by Formula 301:
[Ar301]xb11−[(L301)xb1−R301]xb21 [Formula 301]
In Formula 301,
In an embodiment, in Formula 301, when xb11 is 2 or more, two or more of Ar301 (s) may be linked to each other via a single bond.
In embodiments, the host may include a compound represented by Formula 301-1, a compound represented by Formula 301-2, or any combination thereof:
In embodiments, the host may include an alkali earth metal complex, a post-transition metal complex, or any combination thereof. For example, the host may include a Be complex (for example, Compound H55), an Mg complex, a Zn complex, or any combination thereof.
In an embodiment, the host may include: one of Compounds H1 to H128; 9,10-di(2-naphthyl)anthracene (ADN); 2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN); 9,10-di-(2-naphthyl)-2-t-butyl-anthracene (TBADN); 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP); 1,3-di(carbazol-9-yl)benzene (mCP); 1,3,5-tri(carbazol-9-Abenzene (TCP); or any combination thereof:
[Phosphorescent Dopant]
In embodiments, the phosphorescent dopant may include at least one transition metal as a central metal.
The phosphorescent dopant may include a monodentate ligand, a bidentate ligand, a tridentate ligand, a tetradentate ligand, a pentadentate ligand, a hexadentate ligand, or any combination thereof.
The phosphorescent dopant may be electrically neutral.
In an embodiment, the phosphorescent dopant may include an organometallic compound represented by Formula 401:
In Formulae 401 and 402,
In an embodiment, in Formula 402, X401 may be nitrogen and X402 may be carbon, or X401 and X402 may each be nitrogen.
In an embodiment, in Formula 401, when xc1 is 2 or more, two ring A401(s) among two or more of L401 may optionally be bonded to each other via T402, which is a linking group, and two ring A402(s) among two or more of L401 may optionally be bonded to each other via T403, which is a linking group (see Compounds PD1 to PD4 and PD7). T402 and T403 may each independently be as described for T401.
In Formula 401, L402 may be an organic ligand. For example, L402 may include a halogen group, a diketone group (for example, an acetylacetonate group), a carboxylic acid group (for example, a picolinate group), —C(═O), an isonitrile group, —CN group, a phosphorus group (for example, a phosphine group, a phosphite group, etc.), or any combination thereof.
In an embodiment, the phosphorescent dopant may include, for example, one of Compounds PD1 to PD39, or any combination thereof:
[Fluorescent Dopant]
The fluorescent dopant may include an amine group-containing compound, a styryl group-containing compound, or any combination thereof.
In an embodiment, the fluorescent dopant may include a compound represented by Formula 501:
In Formula 501,
In an embodiment, in Formula 501, Ar501 may be a condensed cyclic group (for example, an anthracene group, a chrysene group, or a pyrene group) in which three or more monocyclic groups are condensed together.
In embodiments, in Formula 501, xd4 may be 2.
In an embodiment, the fluorescent dopant may include: one of Compounds FD1 to FD37; DPVBi; DPAVBi; or any combination thereof:
[Delayed Fluorescence Material]
The emission layer 130 may include a delayed fluorescence material.
In the specification, the delayed fluorescence material may be selected from compounds capable of emitting delayed fluorescent light based on a delayed fluorescence emission mechanism.
The delayed fluorescence material included in the emission layer 130 may serve as a host or as a dopant, depending on the types of other materials included in the emission layer 130.
In embodiments, a difference between a triplet energy level (eV) of the delayed fluorescence material and a singlet energy level (eV) of the delayed fluorescence material may be greater than or equal to 0 eV and less than or equal to 0.5 eV. When the difference between a triplet energy level (eV) of the delayed fluorescence material and a singlet energy level (eV) of the delayed fluorescence material satisfies the above-described range, up-conversion from the triplet state to the singlet state of the delayed fluorescence material may effectively occur, and thus, the luminescence efficiency of the light-emitting device 10 may be improved.
In embodiments, the delayed fluorescence material may include: a material including at least one electron donor (for example, a π electron-rich C3-C60 cyclic group, such as a carbazole group) and at least one electron acceptor (for example, a sulfoxide group, a cyano group, or a π electron-deficient nitrogen-containing C1-C60 cyclic group); or a material including a C8-C60 polycyclic group in which two or more cyclic groups are condensed while sharing boron (B).
Examples of a delayed fluorescence material may include at least one of Compounds DF1 to DF14:
[Quantum Dot]
The emission layer 130 may include a quantum dot.
In the specification, a quantum dot may be a crystal of a semiconductor compound, and may include any material capable of emitting light of various emission wavelengths according to a size of the crystal.
A diameter of the quantum dot may be, for example, in a range of about 1 nm to about 10 nm.
The quantum dot may be synthesized by a wet chemical process, a metal organic chemical vapor deposition process, a molecular beam epitaxy process, or any process similar thereto.
The wet chemical process is a method that includes mixing a precursor material with an organic solvent and growing a quantum dot particle crystal. When the crystal grows, the organic solvent naturally acts as a dispersant coordinated on the surface of the quantum dot crystal and controls the growth of the crystal so that the growth of quantum dot particles can be controlled through a process which costs less, and may be more readily performed than vapor deposition methods, such as metal organic chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE),
The quantum dot may include a Group II-VI semiconductor compound, a Group III-V semiconductor compound, a Group III-VI semiconductor compound, a Group I-III-VI semiconductor compound, a Group IV-VI semiconductor compound, a Group IV element or compound, or any combination thereof.
Examples of a Group II-VI semiconductor compound may include: a binary compound, such as CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, or MgS; a ternary compound, such as CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, or MgZnS; a quaternary compound, such as CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, or HgZnSTe; or any combination thereof.
Examples of a Group III-V semiconductor compound may include: a binary compound, such as GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, or InSb; a ternary compound, such as GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InAlP, InNAs, InNSb, InPAs, or 0; a quaternary compound, such as GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, or InAlPSb; or any combination thereof. In an embodiment, the Group III-V semiconductor compound may further include a Group II element. Examples of a Group III-V semiconductor compound further including a Group II element may include InZnP, InGaZnP, InAlZnP, etc.
Examples of a Group III-VI semiconductor compound may include: a binary compound, such as GaS, GaSe, Ga2Se3, GaTe, InS, InSe, In2S3, In2Se3, or InTe; a ternary compound, such as InGaS3, or InGaSe3; or any combination thereof.
Examples of a Group I-III-VI semiconductor compound may include: a ternary compound such as AgInS, AgInS2, CuInS, CuInS2, CuGaO2, AgGaO2, or AgAlO2; a quaternary compound such as AgInGaS or AgInGaS2; or any combination thereof.
Examples of a Group IV-VI semiconductor compound may include: a binary compound, such as SnS, SnSe, SnTe, PbS, PbSe, or PbTe; a ternary compound, such as SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, or SnPbTe; a quaternary compound, such as SnPbSSe, SnPbSeTe, or SnPbSTe; or any combination thereof.
Examples of a Group IV element or compound may include: a single element, such as Si or Ge; a binary compound, such as SiC or SiGe; or any combination thereof.
Each element included in a multi-element compound, such as a binary compound, a ternary compound, and a quaternary compound, may be present in a particle at a uniform concentration or at a non-uniform concentration.
In an embodiment, the quantum dot may have a single structure in which the concentration of each element in the quantum dot is uniform, or the quantum dot may have a core-shell structure. In an embodiment, in case that the quantum dot has a core-shell structure, a material included in the core and a material included in the shell may be different from each other.
The shell of the quantum dot may serve as a protective layer that prevents chemical degeneration of the core to maintain semiconductor characteristics, and/or may serve as a charging layer that imparts electrophoretic characteristics to the quantum dot. The shell may be a single layer or a multi-layer. An interface between the core and the shell may have a concentration gradient in which the concentration of a material that is present in the shell decreases toward the core.
Examples of a shell of a quantum dot may include a metal oxide, a metalloid oxide, a non-metal oxide, a semiconductor compound, and any combination thereof. Examples of a metal oxide, a metalloid oxide, or a non-metal oxide may include: a binary compound, such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, or NiO; a ternary compound, such as MgAl2O4, CoFe2O4, NiFe2O4, or CoMn2O4; and any combination thereof.
Examples of a semiconductor compound may include, as described herein, a Group II-VI semiconductor compound, a Group III-V semiconductor compound, a Group III-VI semiconductor compound, a Group I-III-VI semiconductor compound, a Group IV-VI semiconductor compound, and any combination thereof. Examples of a semiconductor compound may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, or any combination thereof.
A full width at half maximum (FWHM) of an emission wavelength spectrum of the quantum dot may be equal to or less than about 45 nm. For example, a FWHM of an emission wavelength spectrum of the quantum dot may be equal to or less than about 40 nm. For example, a FWHM of an emission wavelength spectrum of the quantum dot may be equal to or less than about 30 nm. Within any of these ranges, color purity or color reproducibility may be increased. Light emitted through a quantum dot may be emitted in all directions, so that a wide viewing angle may be improved.
In embodiments, the quantum dot may be in the form of a spherical particle, a pyramidal particle, a multi-arm particle, a cubic nanoparticle, a nanotube particle, a nanowire particle, a nanofiber particle, or a nanoplate particle.
Since the energy band gap may be adjusted by controlling the size of the quantum dot, light having various wavelength bands may be obtained from a quantum dot emission layer. Accordingly, by using quantum dots of different sizes, a light-emitting device that emits light of various wavelengths may be implemented. In embodiments, the size of the quantum dot may be selected to emit red light, green light, and/or blue light. In an embodiment, the size of the quantum dot may be configured to emit white light by a combination of light of various colors.
[Electron Transport Region 140]
The electron transport region 140 may have a structure consisting of a layer consisting of a single material, a structure consisting of a layer including different materials, or a structure including multiple layers including different materials.
The electron transport region 140 may include a buffer layer, a hole blocking layer, an electron control layer, an electron transport layer, an electron injection layer, or any combination thereof.
In embodiments, the electron transport region 140 may have an electron transport layer/electron injection layer structure, a hole blocking layer/electron transport layer/electron injection layer structure, an electron control layer/electron transport layer/electron injection layer structure, or a buffer layer/electron transport layer/electron injection layer structure, wherein the layers of each structure may be stacked from an emission layer 130 in its respective stated order, but the structure of the electron transport region 140 is not limited thereto.
In an embodiment, the electron transport region 140 (for example, a buffer layer, a hole blocking layer, an electron control layer, or an electron transport layer in the electron transport region 140) may include a metal-free compound including at least one π electron-deficient nitrogen-containing C1-C60 cyclic group.
In an embodiment, the electron transport region 140 may include a compound represented by Formula 601:
[Ar601]xe11−[(L601)xe1−R601]xe21 [Formula 601]
In Formula 601,
In an embodiment, in Formula 601, when xe11 is 2 or more, two or more of Ar601 (s) may be linked to each other via a single bond.
In embodiments, in Formula 601, Ar601 may be an anthracene group unsubstituted or substituted with at least one R10a.
In embodiments, the electron transport region 140 may include a compound represented by Formula 601-1:
In embodiments, in Formulae 601 and 601-1, xe1 and xe611 to xe613 may each independently be 0, 1, or 2.
The electron transport region 140 may include one of Compounds ET1 to ET45, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq3, BAlq, TAZ, NTAZ, or any combination thereof:
A thickness of the electron transport region 140 may be in a range of about 100 Å to about 5,000 Å. For example, the thickness of the electron transport region 140 may be in a range of about 160 Å to about 4,000 Å. When the electron transport region 140 includes a buffer layer, a hole blocking layer, an electron control layer, an electron transport layer, or any combination thereof, a thickness of the buffer layer, the hole blocking layer, or the electron control layer may each independently be in a range of about 20 Å to about 1,000 Å, and a thickness of the electron transport layer may be in a range of about 100 Å to about 1,000 Å. For example, the thickness of the buffer layer, the hole blocking layer, or the electron control layer may each independently be in a range of about 30 Å to about 300 Å. For example, the thickness of the electron transport layer may be in a range of about 150 Å to about 500 Å. When the thickness of the buffer layer, the hole blocking layer, the electron control layer, the electron transport layer, and/or the electron transport region 140 are within these ranges, satisfactory electron transporting characteristics may be obtained without a substantial increase in driving voltage.
The electron transport region 140 (for example, an electron transport layer in the electron transport region 140) may further include, in addition to the materials described above, a metal-containing material.
The metal-containing material may include an alkali metal complex, an alkaline earth metal complex, or any combination thereof. A metal ion of an alkali metal complex may be a Li ion, a Na ion, a K ion, a Rb ion, or a Cs ion, and a metal ion of an alkaline earth metal complex may be a Be ion, a Mg ion, a Ca ion, a Sr ion, or a Ba ion.
A ligand coordinated with a metal ion of the alkali metal complex or a metal ion of the alkaline earth-metal complex may each independently include a hydroxyquinoline, a hydroxyisoquinoline, a hydroxybenzoquinoline, a hydroxyacridine, a hydroxyphenanthridine, a hydroxyphenyloxazole, a hydroxyphenylthiazole, a hydroxyphenyloxadiazole, a hydroxyphenylthiadiazole, a hydroxyphenylpyridine, a hydroxyphenylbenzimidazole, a hydroxyphenylbenzothiazole, a bipyridine, a phenanthroline, a cyclopentadiene, or any combination thereof.
For example, the metal-containing material may include a Li complex. The Li complex may include, for example, Compound ET-D1 (LiQ) or Compound ET-D2:
The electron transport region 140 may include an electron injection layer that facilitates the injection of electrons from the second electrode 150. The electron injection layer may directly contact the second electrode 150.
The electron injection layer may have a structure consisting of a layer consisting of a single material, a structure consisting of a layer including different materials, or a structure including multiple layers including different materials.
The electron injection layer may include an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal-containing compound, an alkaline earth metal-containing compound, a rare earth metal-containing compound, an alkali metal complex, an alkaline earth metal complex, a rare earth metal complex, or any combination thereof.
The alkali metal may include Li, Na, K, Rb, Cs, or any combination thereof. The alkaline earth metal may include Mg, Ca, Sr, Ba, or any combination thereof. The rare earth metal may include Sc, Y, Ce, Tb, Yb, Gd, or any combination thereof.
The alkali metal-containing compound, the alkaline earth metal-containing compound, and the rare earth metal-containing compound may be oxides, halides (for example, fluorides, chlorides, bromides, or iodides), or tellurides of the alkali metal, the alkaline earth metal, and the rare earth metal, or any combination thereof.
The alkali metal-containing compound may include: an alkali metal oxide, such as Li2O, Cs2O, or K2O; an alkali metal halide, such as LiF, NaF, CsF, KF, LiI, NaI, CsI, or KI; or any combination thereof. The alkaline earth metal-containing compound may include an alkaline earth metal compound, such as BaO, SrO, CaO, BaxSr1-xO (wherein x is a real number satisfying the condition of 0<x<1), BaxCa1-xO (wherein x is a real number satisfying the condition of 0<x<1), or the like. The rare earth metal-containing compound may include YbF3, ScF3, Sc2O3, Y2O3, Ce2O3, GdF3, TbF3, YbI3, ScI3, TbI3, or any combination thereof. In embodiments, the rare earth metal-containing compound may include a lanthanide metal telluride. Examples of a lanthanide metal telluride may include LaTe, CeTe, PrTe, NdTe, PmTe, SmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, La2Te3, Ce2Te3, Pr2Te3, Nd2Te3, Pm2Te3, Sm2Te3, Eu2Te3, Gd2Te3, Tb2Te3, Dy2Te3, Ho2Te3, Er2Te3, Tm2Te3, Yb2Te3, and Lu2Te3.
The alkali metal complex, the alkaline earth-metal complex, and the rare earth metal complex may include: an alkali metal ion, an alkaline earth metal ion, or a rare earth metal ion; and a ligand linked to the metal ion (for example, a hydroxyquinoline, a hydroxyisoquinoline, a hydroxybenzoquinoline, a hydroxyacridine, a hydroxyphenanthridine, a hydroxyphenyloxazole, a hydroxyphenylthiazole, a hydroxyphenyloxadiazole, a hydroxyphenylthiadiazole, a hydroxyphenylpyridine, a hydroxyphenyl benzimidazole, a hydroxyphenylbenzothiazole, a bipyridine, a phenanthroline, a cyclopentadiene, or any combination thereof).
The electron injection layer may consist of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal-containing compound, an alkaline earth metal-containing compound, a rare earth metal-containing compound, an alkali metal complex, an alkaline earth metal complex, a rare earth metal complex, or any combination thereof, as described above. In embodiments, the electron injection layer may further include an organic material (for example, a compound represented by Formula 601).
In embodiments, the electron injection layer may consist of an alkali metal-containing compound (for example, an alkali metal halide); or the electron injection layer may consist of an alkali metal-containing compound (for example, an alkali metal halide), and an alkali metal, an alkaline earth metal, a rare earth metal, or any combination thereof. For example, the electron injection layer may be a KI:Yb co-deposited layer, an RbI:Yb co-deposited layer, a LiF:Yb co-deposited layer, or the like.
When the electron injection layer further includes an organic material, an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal-containing compound, an alkaline earth metal-containing compound, a rare earth metal-containing compound, an alkali metal complex, an alkaline earth-metal complex, a rare earth metal complex, or any combination thereof may be uniformly or non-uniformly dispersed in a matrix including the organic material.
A thickness of the electron injection layer may be in a range of about 1 Å to about 100 Å. For example, the thickness of the electron injection layer may be in a range of about 3 Å to about 90 Å. When the thickness of the electron injection layer is within any of the ranges described above, satisfactory electron injection characteristics may be obtained without a substantial increase in driving voltage.
[Second Electrode 150]
The second electrode 150 may be arranged on the electron transport region 140. The second electrode 150 may be a cathode, which is an electron injection electrode. A material for forming the second electrode 150 may include a material having a low-work function, such as a metal, an alloy, an electrically conductive compound, or any combination thereof.
The second electrode 150 may include lithium (Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), magnesium-silver (Mg—Ag), ytterbium (Yb), silver-ytterbium (Ag—Yb), ITO, IZO, or any combination thereof. The second electrode 150 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode.
The second electrode 150 may have a single-layered structure or a multi-layered structure.
[Capping Layer]
The light-emitting device 10 may include a first capping layer outside the first electrode 110, and/or a second capping layer outside the second electrode 150. For example, the light-emitting device 10 may have a structure in which the first capping layer, the first electrode 110, the interlayer, and the second electrode 150 are stacked in this stated order, a structure in which the first electrode 110, the interlayer, the second electrode 150, and the second capping layer are stacked in this stated order, or a structure in which the first capping layer, the first electrode 110, the interlayer, the second electrode 150, and the second capping layer are stacked in this stated order.
Light generated in the emission layer 130 of the light-emitting device 10 may be extracted toward the outside through the first electrode 110, which may be a semi-transmissive electrode or a transmissive electrode, and through the first capping layer. Light generated in the emission layer 130 of the light-emitting device 10 may be extracted toward the outside through the second electrode 150, which may be a semi-transmissive electrode or a transmissive electrode, and through the second capping layer.
The first capping layer and the second capping layer may each increase external emission efficiency according to the principle of constructive interference. Accordingly, the light extraction efficiency of the light-emitting device 10 may be increased, so that the luminescence efficiency of the light-emitting device 10 may be improved.
The first capping layer and the second capping layer may each include a material having a refractive index equal to or greater than about 1.6 (with respect to a wavelength of about 589 nm).
The first capping layer and the second capping layer may each independently be an organic capping layer including an organic material, an inorganic capping layer including an inorganic material, or an organic-inorganic composite capping layer including an organic material and an inorganic material.
At least one of the first capping layer and the second capping layer may each independently include a carbocyclic compound, a heterocyclic compound, an amine group-containing compound, a porphine derivative, a phthalocyanine derivative, a naphthalocyanine derivative, an alkali metal complex, an alkaline earth metal complex, or any combination thereof. The carbocyclic compound, the heterocyclic compound, and the amine group-containing compound may be optionally substituted with a substituent including O, N, S, Se, Si, F, Cl, Br, I, or any combination thereof.
In embodiments, at least one of the first capping layer and the second capping layer may each independently include an amine group-containing compound.
In embodiments, at least one of the first capping layer and the second capping layer may each independently include a compound represented by Formula 201, a compound represented by Formula 202, or any combination thereof.
In embodiments, at least one of the first capping layer and the second capping layer may each independently include one of Compounds HT28 to HT33, one of Compounds CP1 to CP6, β-NPB, or any combination thereof:
[Film]
The organometallic compound represented by Formula 1 may be included in various films. According to embodiments, a film including an organometallic compound represented by Formula 1 may be provided. The film may be, for example, an optical member (or a light control means) (for example, a color filter, a color conversion member, a capping layer, a light extraction efficiency enhancement layer, a selective light absorbing layer, a polarizing layer, a quantum dot-containing layer, or like), a light-shielding member (for example, a light reflective layer, a light absorbing layer, or the like), or a protective member (for example, an insulating layer, a dielectric layer, or the like).
[Electronic Apparatus]
The light-emitting device may be included in various electronic apparatuses. In embodiments, the electronic apparatus including the light-emitting device may be a light-emitting apparatus, an authentication apparatus, or the like.
The electronic apparatus (e.g., a display apparatus) may further include, in addition to the light-emitting device, a color filter, a color conversion layer, or a color filter and a color conversion layer. The color filter and/or the color conversion layer may be located in at least one direction in which light emitted from the light-emitting device travels. In embodiments, the light emitted from the light-emitting device may be blue light or white light. The light-emitting device may be a light-emitting device as described herein. In embodiments, the color conversion layer may include a quantum dot. The quantum dot may be, for example, a quantum dot as described herein.
The electronic apparatus may include a first substrate. The first substrate may include subpixels, the color filter may include color filter areas respectively corresponding to the subpixels, and the color conversion layer may include color conversion areas respectively corresponding to the subpixels.
A pixel defining film may be located between the subpixels to define each subpixel.
The color filter may further include color filter areas and light-shielding patterns located between the color filter areas, and the color conversion layer may further include color conversion areas and light-shielding patterns located between the color conversion areas.
The color filter areas (or the color conversion areas) may include a first area emitting first color light, a second area emitting second color light, and/or a third area emitting third color light, wherein the first color light, the second color light, and/or the third color light may have different maximum emission wavelengths from one another. For example, the first color light may be red light, the second color light may be green light, and the third color light may be blue light. In an embodiment, the color filter areas (or the color conversion areas) may include quantum dots. For example, the first area may include a red quantum dot, the second area may include a green quantum dot, and the third area may not include a quantum dot. The quantum dot may be a quantum dot as described herein. The first area, the second area, and/or the third area may each further include a scatterer.
In an embodiment, the light-emitting device may emit first light, the first area may absorb the first light to emit first-first color light, the second area may absorb the first light to emit second-first color light, and the third area may absorb the first light to emit third-first color light. In this regard, the first-first color light, the second-first color light, and the third-first color light may have different maximum emission wavelengths from each other. For example, the first light may be blue light, the first-first color light may be red light, the second-first color light may be green light, and the third-first color light may be blue light.
The electronic apparatus may further include a thin-film transistor, in addition to the light-emitting device as described above. The thin-film transistor may include a source electrode, a drain electrode, and an active layer, wherein any one of the source electrode and the drain electrode may be electrically connected to any one of the first electrode and the second electrode of the light-emitting device.
The thin-film transistor may further include a gate electrode, a gate insulating film, or the like.
The active layer may include crystalline silicon, amorphous silicon, an organic semiconductor, an oxide semiconductor, or the like.
The electronic apparatus may further include a sealing portion for sealing the light-emitting device. The sealing portion may be located between the color filter and/or the color conversion layer, and the light-emitting device. The sealing portion may allow light from the light-emitting device to be extracted to the outside, and may simultaneously prevent ambient air and moisture from penetrating into the light-emitting device. The sealing portion may be a sealing substrate including a transparent glass substrate or a plastic substrate. The sealing portion may be a thin-film encapsulation layer including an organic layer and/or an inorganic layer. When the sealing portion is a thin-film encapsulation layer, the electronic apparatus may be flexible.
Various functional layers may be further included on the sealing portion, in addition to the color filter and/or the color conversion layer, according to the use of the electronic apparatus. Examples of a functional layer may include a touch screen layer, a polarizing layer, and the like. The touch screen layer may be a pressure-sensitive touch screen layer, a capacitive touch screen layer, or an infrared touch screen layer. The authentication apparatus may be, for example, a biometric authentication apparatus that authenticates an individual by using biometric information of a living body (for example, fingertips, pupils, etc.).
The authentication apparatus may further include, in addition to the light-emitting device as described above, a biometric information collector.
The electronic apparatus may be applied to various displays, light sources, lighting, personal computers (for example, a mobile personal computer), mobile phones, digital cameras, electronic organizers, electronic dictionaries, electronic game machines, medical instruments (for example, electronic thermometers, sphygmomanometers, blood glucose meters, pulse measurement devices, pulse wave measurement devices, electrocardiogram displays, ultrasonic diagnostic devices, or endoscope displays), fish finders, various measuring instruments, meters (for example, meters for a vehicle, an aircraft, and a vessel), projectors, and the like.
[Electronic Device]
The light-emitting device may be included in various electronic devices.
For example, the electronic device including the light-emitting device may be a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, an indoor light, an outdoor light, a signal light, a head-up display, a fully transparent display, a partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a mobile phone, a tablet personal computer, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a three-dimensional (3D) display, a virtual reality display, an augmented reality display, a vehicle, a video wall including multiple displays tiled together, a theater screen, a stadium screen, a phototherapy device, or a signboard.
As the light-emitting device may have excellent color conversion efficiency and long lifespan, an electronic device including the light-emitting device may have characteristics such as high luminance, high resolution, and low power consumption.
[Description of
The electronic apparatus of
The substrate 100 may be a flexible substrate, a glass substrate, or a metal substrate. A buffer layer 210 may be located on the substrate 100. The buffer layer 210 may prevent penetration of impurities through the substrate 100 and may provide a flat surface on the substrate 100.
A TFT may be located on the buffer layer 210. The TFT may include an active layer 220, a gate electrode 240, a source electrode 260, and a drain electrode 270.
The active layer 220 may include an inorganic semiconductor such as silicon or polysilicon, an organic semiconductor, or an oxide semiconductor, and may include a source region, a drain region, and a channel region.
A gate insulating film 230 for insulating the active layer 220 from the gate electrode 240 may be located on the active layer 220, and the gate electrode 240 may be located on the gate insulating film 230.
An interlayer insulating film 250 may be located on the gate electrode 240. The interlayer insulating film 250 may be located between the gate electrode 240 and the source electrode 260 to insulate the gate electrode 240 from the source electrode 260 and between the gate electrode 240 and the drain electrode 270 to insulate the gate electrode 240 from the drain electrode 270.
The source electrode 260 and the drain electrode 270 may be located on the interlayer insulating film 250. The interlayer insulating film 250 and the gate insulating film 230 may be formed to expose a source region and a drain region of the active layer 220, and the source electrode 260 and the drain electrode 270 may respectively contact the exposed portions of the source region and the drain region of the active layer 220.
The TFT may be electrically connected to a light-emitting device to drive the light-emitting device, and is covered and protected by a passivation layer 280. The passivation layer 280 may include an inorganic insulating film, an organic insulating film, or any combination thereof. A light-emitting device may be provided on the passivation layer 280. The light-emitting device may include a first electrode 110, an interlayer, and a second electrode 150.
The first electrode 110 may be located on the passivation layer 280. The passivation layer 280 may not completely cover the drain electrode 270 and may expose a portion of the drain electrode 270. The first electrode 110 may be electrically connected to the exposed portion of the drain electrode 270.
A pixel defining layer 290 including an insulating material may be located on the first electrode 110. The pixel defining layer 290 may expose a region of the first electrode 110, and an interlayer may be formed on the exposed region of the first electrode 110. The pixel defining layer 290 may be a polyimide or polyacrylic organic film. Although not shown in
The second electrode 150 may be disposed on the interlayer, and a capping layer 170 may be further included on the second electrode 150. The capping layer 170 may be formed to cover the second electrode 150.
The encapsulation portion 300 may be located on the capping layer 170. The encapsulation portion 300 may be located on a light-emitting device to protect the light-emitting device from moisture and/or oxygen. The encapsulation portion 300 may include: an inorganic film including silicon nitride (SiNx), silicon oxide (SiOx), indium tin oxide, indium zinc oxide, or any combination thereof; an organic film including polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, an acrylic resin (for example, polymethyl methacrylate, polyacrylic acid, or the like), an epoxy-based resin (for example, aliphatic glycidyl ether (AGE), or the like), or any combination thereof; or any combination of the inorganic films and the organic films.
The electronic apparatus of
[Description of
The electronic device 1, which may be an apparatus that displays a moving image or still image, may be not only a portable electronic device, such as a mobile phone, a smartphone, a tablet personal computer (PC), a mobile communication terminal, an electronic notebook, an electronic book, a portable multimedia player (PMP), a navigation device, or an ultra-mobile PC (UMPC), but may also be various products, such as a television, a laptop computer, a monitor, a billboard, or an Internet of things (IOT). The electronic device 1 may be such a product as described above or a part thereof.
In an embodiment, the electronic device 1 may be a wearable device, such as a smart watch, a watch phone, a glasses-type display, or a head mounted display (HMD), or a part of the wearable device. However, embodiments are not limited thereto.
For example, the electronic device 1 may be a center information display (CID) of a vehicle, an instrument panel of a vehicle, a center fascia of a vehicle, a dashboard of a vehicle, a room mirror display instead of a side mirror of a vehicle, an entertainment display for the rear seat of a vehicle, a display placed on the back of the front seat, a head up display (HUD) installed in front of a vehicle or projected on a front window glass, or a computer generated hologram augmented reality head up display (CGH AR HUD). For convenience of explanation,
An electronic device 1 may include a display area DA and a non-display area NDA outside the display area DA. The electronic device 1 may implement an image through a two-dimensional array of pixels that are arranged in the display area DA.
The non-display area NDA is an area that does not display an image, and may surround the display area DA. A driver for providing electrical signals or power to display devices arranged in the display area DA may be arranged in the non-display area NDA. A pad, which is an area to which an electronic element or a printed circuit board may be electrically connected, may be arranged in the non-display area NDA.
In the electronic device 1, a length in an x-axis direction and a length in a y-axis direction may be different from each other. In an embodiment, as shown in
[Descriptions of
Referring to
The vehicle 1000 may travel on a road or a track. The vehicle 1000 may move in a given direction according to the rotation of at least one wheel. Examples of the vehicle 1000 may include a three-wheeled or four-wheeled vehicle, a construction machine, a two-wheeled vehicle, a prime mover device, a bicycle, and a train running on a track.
The vehicle 1000 may include a body having an interior and an exterior, and a chassis that is a portion excluding the body in which mechanical apparatuses necessary for driving are installed. The exterior of the vehicle body may include a front panel, a bonnet, a roof panel, a rear panel, a trunk, a pillar provided at a boundary between doors, and the like. The chassis of the vehicle 1000 may include a power generating device, a power transmitting device, a driving device, a steering device, a braking device, a suspension device, a transmission device, a fuel device, front, rear, left, and right wheels, and the like.
The vehicle 1000 may include a side window glass 1100, a front window glass 1200, a side mirror 1300, a cluster 1400, a center fascia 1500, a passenger seat dashboard 1600, and a display device 2.
The side window glass 1100 and the front window glass 1200 may be partitioned by a pillar arranged between the side window glass 1100 and the front window glass 1200.
The side window glass 1100 may be installed on a side of the vehicle 1000. In an embodiment, the side window glass 1100 may be installed in a door of the vehicle 1000. Multiple side window glasses 1100 may be provided and may face each other. In an embodiment, the side window glass 1100 may include a first side window glass 1110 and a second side window glass 1120. In an embodiment, the first side window glass 1110 may be arranged adjacent to the cluster 1400, and the second side window glass 1120 may be arranged adjacent to the passenger seat dashboard 1600.
In an embodiment, the side window glasses 1100 may be spaced apart from each other in an x-direction or in a −x-direction. For example, the first side window glass 1110 and the second side window glass 1120 may be spaced apart from each other in the x-direction or in the −x-direction. For example, an imaginary straight line L connecting the side window glasses 1100 may extend in the x-direction or in the −x-direction. For example, an imaginary straight line L connecting the first side window glass 1110 and the second side window glass 1120 to each other may extend in the x-direction or in the −x-direction.
The front window glass 1200 may be installed on the front of the vehicle 1000. The front window glass 1200 may be arranged between the side window glasses 1100 facing each other.
The side mirror 1300 may provide a rear view of the vehicle 1000. The side mirror 1300 may be installed on the exterior of the body. In an embodiment, multiple side mirrors 1300 may be provided. One of the side mirrors 1300 may be arranged outside the first side window glass 1110. Another one of the side mirrors 1300 may be arranged outside the second side window glass 1120.
The cluster 1400 may be arranged in front of a steering wheel. The cluster 1400 may include a tachometer, a speedometer, a coolant thermometer, a fuel gauge, a turn signal indicator, a high beam indicator, a warning light, a seat belt warning light, an odometer, an automatic transmission selector indicator light, a door open warning light, an engine oil warning light, and/or a low fuel warning light.
The center fascia 1500 may include a control panel on which buttons for adjusting an audio device, an air conditioning device, and a seat heater are disposed. The center fascia 1500 may be arranged on a side of the cluster 1400.
A passenger seat dashboard 1600 may be spaced apart from the cluster 1400 with the center fascia 1500 arranged therebetween. In an embodiment, the cluster 1400 may be disposed to correspond to a driver seat (not shown), and the passenger seat dashboard 1600 may be disposed to correspond to a passenger seat (not shown). In an embodiment, the cluster 1400 may be adjacent to the first side window glass 1110, and the passenger seat dashboard 1600 may be adjacent to the second side window glass 1120.
In an embodiment, the display device 2 may include a display panel 3, and the display panel 3 may display an image. The display device 2 may be arranged inside the vehicle 1000. In an embodiment, the display device 2 may be arranged between the side window glasses 1100 facing each other. The display device 2 may be arranged in at least one of the cluster 1400, the center fascia 1500, and the passenger seat dashboard 1600.
The display device 2 may include an organic light-emitting display device, an inorganic electroluminescent (EL) display device, a quantum dot display device, or the like. Hereinafter, an organic light-emitting display device including the light-emitting device according to an embodiment will be described as an example of the display device 2. However, various types of display devices as described herein may be used in embodiments.
Referring to
Referring to
Referring to
[Manufacturing Method]
Respective layers included in the hole transport region 120, the emission layer 130, and respective layers included in the electron transport region 140 may be formed in a selected region by using one or more suitable methods selected from vacuum deposition, spin coating, casting, Langmuir-Blodgett (LB) deposition, ink-jet printing, laser-printing, laser-induced thermal imaging, and the like.
When layers constituting the hole transport region 120, the emission layer 130, and layers constituting the electron transport region 140 are formed by vacuum deposition, the deposition may be performed at a deposition temperature of about 100° C. to about 500° C., a vacuum degree of about 10−8 torr to about 10−3 torr, and a deposition speed of about 0.01 Å/sec to about 100 Å/sec, depending on a material to be included in a layer to be formed and the structure of a layer to be formed.
The term “C3-C60 carbocyclic group” as used herein may be a cyclic group having 3 to 60 carbon atoms and consisting of carbon atoms as the only ring-forming atoms. The term “C1-C60 heterocyclic group” as used herein may be a cyclic group having 1 to 60 carbon atoms that further includes at least one heteroatom as a ring-forming atom, in addition to a carbon atom. The C3-C60 carbocyclic group and the C1-C60 heterocyclic group may each be a monocyclic group consisting of one ring or a polycyclic group in which two or more rings are condensed with each other. For example, a C1-C60 heterocyclic group may have 3 to 61 ring-forming atoms.
The term “cyclic group” as used herein may be a C3-C60 carbocyclic group or a C1-C60 heterocyclic group.
The term “π electron-rich C3-C60 cyclic group” as used herein may be a cyclic group having 3 to 60 carbon atoms and may not include *—N═*′ as a ring-forming moiety.
The term “π electron-deficient nitrogen-containing C1-C60 cyclic group” as used herein may be a heterocyclic group having 1 to 60 carbon atoms and may include *—N═*′ as a ring-forming moiety.
In embodiments,
The T1 group may be a cyclopropane group, a cyclobutane group, a cyclopentane group, a cyclohexane group, a cycloheptane group, a cyclooctane group, a cyclobutene group, a cyclopentene group, a cyclopentadiene group, a cyclohexene group, a cyclohexadiene group, a cycloheptene group, an adamantane group, a norbornane (or a bicyclo[2.2.1]heptane) group, a norbornene group, a bicyclo[1.1.1]pentane group, a bicyclo[2.1.1]hexane group, a bicyclo[2.2.2]octane group, or a benzene group.
The T2 group may be a furan group, a thiophene group, a 1H-pyrrole group, a silole group, a borole group, a 2H-pyrrole group, a 3H-pyrrole group, an imidazole group, a pyrazole group, a triazole group, a tetrazole group, an oxazole group, an isoxazole group, an oxadiazole group, a thiazole group, an isothiazole group, a thiadiazole group, an azasilole group, an azaborole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a tetrazine group, a pyrrolidine group, an imidazolidine group, a dihydropyrrole group, a piperidine group, a tetrahydropyridine group, a dihydropyridine group, a hexahydropyrimidine group, a tetrahydropyrimidine group, a dihydropyrimidine group, a piperazine group, a tetrahydropyrazine group, a dihydropyrazine group, a tetrahydropyridazine group, or a dihydropyridazine group.
The T3 group may be a furan group, a thiophene group, a 1H-pyrrole group, a silole group, or a borole group.
The T4 group may be a 2H-pyrrole group, a 3H-pyrrole group, an imidazole group, a pyrazole group, a triazole group, a tetrazole group, an oxazole group, an isoxazole group, an oxadiazole group, a thiazole group, an isothiazole group, a thiadiazole group, an azasilole group, an azaborole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, or a tetrazine group.
The terms “cyclic group,” “C3-C60 carbocyclic group,” “C1-C60 heterocyclic group,” “π electron-rich C3-C60 cyclic group,” and “π electron-deficient nitrogen-containing C1-C60 cyclic group” as used herein may each be a group condensed to any cyclic group, a monovalent group, or a polyvalent group (for example, a divalent group, a trivalent group, a tetravalent group, etc.), according to the structure of a formula for which the corresponding term is used.
For example, a “benzene group” may be a benzo group, a phenyl group, a phenylene group, or the like, which may be readily understood by one of ordinary skill in the art according to the structure of a formula including the “benzene group.”
Examples of a monovalent C3-C60 carbocyclic group or a monovalent C1-C60 heterocyclic group may include a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.
Examples of a divalent C3-C60 carbocyclic group or a divalent C1-C60 heterocyclic group may include a C3-C10 cycloalkylene group, a C1-C10 heterocycloalkylene group, a C3-C10 cycloalkenylene group, a C1-C10 heterocycloalkenylene group, a C6-C60 arylene group, a C1-C60 heteroarylene group, a divalent non-aromatic condensed polycyclic group, and a divalent non-aromatic condensed heteropolycyclic group.
The term “C1-C60 alkyl group” as used herein may be a linear or branched aliphatic hydrocarbon monovalent group that has one to sixty carbon atoms, and examples thereof may include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neopentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctyl group, a sec-octyl group, a tert-octyl group, an n-nonyl group, an isononyl group, a sec-nonyl group, a tert-nonyl group, an n-decyl group, an isodecyl group, a sec-decyl group, and a tert-decyl group.
The term “C1-C60 alkylene group” as used herein may be a divalent group having a same structure as the C1-C60 alkyl group.
The term “C2-C60 alkenyl group” as used herein may be a monovalent hydrocarbon group having at least one carbon-carbon double bond in the middle or at a terminus of a C2-C60 alkyl group, and examples thereof may include an ethenyl group, a propenyl group, and a butenyl group.
The term “C2-C60 alkenylene group” as used herein may be a divalent group having a same structure as the C2-C60 alkenyl group.
The term “C2-C60 alkynyl group” as used herein may be a monovalent hydrocarbon group having at least one carbon-carbon triple bond in the middle or at a terminus of a C2-C60 alkyl group, and examples thereof may include an ethynyl group, a propynyl group, etc.
The term “C2-C60 alkynylene group” as used herein may be a divalent group having a same structure as the C2-C60 alkynyl group.
The term “C1-C60 alkoxy group” as used herein may be a monovalent group represented by —O(A101) (wherein A101 may be a C1-C60 alkyl group), and examples thereof may include a methoxy group, an ethoxy group, and an isopropyloxy group.
The term “C3-C10 cycloalkyl group” as used herein may be a monovalent saturated hydrocarbon cyclic group having 3 to 10 carbon atoms, and examples thereof may include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group (or bicyclo[2.2.1]heptyl group), a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, and a bicyclo[2.2.2]octyl group.
The term “C3-C10 cycloalkylene group” as used herein may be a divalent group having a same structure as the C3-C10 cycloalkyl group.
The term “C1-C10 heterocycloalkyl group” as used herein may be a monovalent cyclic group of 1 to 10 carbon atoms, further including, in addition to carbon atoms, at least one heteroatom, as ring-forming atoms, and examples thereof may include a 1,2,3,4-oxatriazolidinyl group, a tetrahydrofuranyl group, and a tetrahydrothiophenyl group.
The term “C1-C10 heterocycloalkylene group” as used herein may be a divalent group having a same structure as the C1-C10 heterocycloalkyl group.
The term “C3-C10 cycloalkenyl group” as used herein may be a monovalent cyclic group that has three to ten carbon atoms and at least one carbon-carbon double bond in the ring thereof and no aromaticity, and examples thereof may include a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group.
The term “C3-C10 cycloalkenylene group” as used herein may be a divalent group having a same structure as the C3-C10 cycloalkenyl group.
The term “C1-C10 heterocycloalkenyl group” as used herein may be a monovalent cyclic group of 1 to 10 carbon atoms, further including, in addition to carbon atoms, at least one heteroatom, as ring-forming atoms, and having at least one carbon-carbon double bond in the cyclic structure thereof. Examples of a C1-C10 heterocycloalkenyl group may include a 4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-dihydrofuranyl group, and a 2,3-dihydrothiophenyl group.
The term “C1-C10 heterocycloalkenylene group” as used herein may be a divalent group having a same structure as the C1-C10 heterocycloalkenyl group.
The term “C6-C60 aryl group” as used herein may be a monovalent group having a carbocyclic aromatic system of 6 to 60 carbon atoms.
The term “C6-C60 arylene group” as used herein may be a divalent group having a carbocyclic aromatic system of 6 to 60 carbon atoms.
Examples of a C6-C60 aryl group may include a phenyl group, a pentalenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a heptalenyl group, a naphthacenyl group, a picenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, and an ovalenyl group.
When the C6-C60 aryl group and the C6-C60 arylene group each include two or more rings, the respective rings may be condensed with each other.
The term “C1-C60 heteroaryl group” as used herein may be a monovalent group having a heterocyclic aromatic system of 1 to 60 carbon atoms in which at least one heteroatom is included, in addition to a carbon atom, as a ring-forming atom.
The term “C1-C60 heteroarylene group” as used herein may be a divalent group having a heterocyclic aromatic system of 1 to 60 carbon atoms in which at least one heteroatom is included, in addition to a carbon atom, as a ring-forming atom.
Examples of a C1-C60 heteroaryl group may include a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, a benzoquinolinyl group, an isoquinolinyl group, a benzoisoquinolinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthrolinyl group, a phthalazinyl group, and a naphthyridinyl group.
When the C1-C60 heteroaryl group and the C1-C60 heteroarylene group each include two or more rings, the respective rings may be condensed with each other.
The term “monovalent non-aromatic condensed polycyclic group” as used herein may be a monovalent group (for example, having 8 to 60 carbon atoms) having two or more rings condensed to each other, only carbon atoms as ring-forming atoms, and non-aromaticity in its entire molecular structure. Examples of a monovalent non-aromatic condensed polycyclic group may include an indenyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, an indenophenanthrenyl group, and an indeno anthracenyl group.
The term “divalent non-aromatic condensed polycyclic group” as used herein may be a divalent group having a same structure as the monovalent non-aromatic condensed polycyclic group described above.
The term “monovalent non-aromatic condensed heteropolycyclic group” as used herein may be a monovalent group (for example, having 1 to 60 carbon atoms) having two or more rings condensed to each other, further including, in addition to carbon atoms, at least one heteroatom, as ring-forming atoms, and having non-aromaticity in its entire molecular structure. Examples of a monovalent non-aromatic condensed heteropolycyclic group may include a pyrrolyl group, a thiophenyl group, a furanyl group, an indolyl group, a benzoindolyl group, a naphtho indolyl group, an isoindolyl group, a benzoisoindolyl group, a naphthoisoindolyl group, a benzosilolyl group, a benzothiophenyl group, a benzofuranyl group, a carbazolyl group, a dibenzosilolyl group, a dibenzothiophenyl group, a dibenzofuranyl group, an azacarbazolyl group, an azafluorenyl group, an azadibenzosilolyl group, an azadibenzothiophenyl group, an azadibenzofuranyl group, a pyrazolyl group, an imidazolyl group, a triazolyl group, a tetrazolyl group, an oxazolyl group, an isoxazolyl group, a thiazolyl group, an isothiazolyl group, an oxadiazolyl group, a thiadiazolyl group, a benzopyrazolyl group, a benzimidazolyl group, a benzoxazolyl group, a benzothiazolyl group, a benzoxadiazolyl group, a benzothiadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an imidazotriazinyl group, an imidazopyrazinyl group, an imidazopyridazinyl group, an indenocarbazolyl group, an indolocarbazolyl group, a benzofurocarbazolyl group, a benzothienocarbazolyl group, a benzosilolocarbazolyl group, a benzoindolocarbazolyl group, a benzocarbazolyl group, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, a benzonaphthosilolyl group, a benzofurodibenzofuranyl group, a benzofurodibenzothiophenyl group, and a benzothienodibenzothiophenyl group.
The term “divalent non-aromatic condensed heteropolycyclic group” as used herein may be a divalent group having a same structure as the monovalent non-aromatic condensed heteropolycyclic group described above.
The term “C6-C60 aryloxy group” as used herein may be a group represented by —O(A102) (wherein A102 may be a C6-C60 aryl group).
The term “C6-C60 arylthio group” as used herein may be a group represented by —S(A103) (wherein A103 may be a C6-C60 aryl group).
The term “C7-C60 arylalkyl group” as used herein may be a group represented by -(A104)A105) (wherein A104 may be a C1-C54 alkylene group and A105 may be a C6-C59 aryl group).
The term “C2-C60 heteroarylalkyl group” as used herein may be a group represented by −(A106)(A107) (wherein A106 may be a C1-C59 alkylene group and A107 may be a C1-C59 heteroaryl group).
In the specification, the group R10a may be:
In the specification, Q1 to Q3, Q11 to Q13, Q21 to Q23 and Q31 to Q33 may each independently be:
The term “heteroatom” as used herein may be any atom other than a carbon atom or a hydrogen atom. Examples of a heteroatom may include O, S, N, P, Si, B, Ge, Se, and any combination thereof.
The term “third-row transition metal” as used herein may be hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), or the like.
In the specification, “D” refers to deuterium, “Ph” refers to a phenyl group, “Me” refers to a methyl group, “Et” refers to an ethyl group, “tert-Bu” or “But” each refer to a tert-butyl group, “OMe” refers to a methoxy group, and “pin” refers to pinacolato.
The term “biphenyl group” as used herein may be a “phenyl group substituted with a phenyl group.” For example, the “biphenyl group” may be a substituted phenyl group having a C6-C60 aryl group as a substituent.
The term “terphenyl group” as used herein may be a “phenyl group substituted with a biphenyl group”. For example, the “terphenyl group” may be a substituted phenyl group having, as a substituent, a C6-C60 aryl group substituted with a C6-C60 aryl group.
The symbols *, *′, and *” as used herein, unless defined otherwise, each refer to a binding site to a neighboring atom in a corresponding formula or moiety.
In the specification, the terms “x-axis,” “y-axis,” and “z-axis” are not limited to three axes in an orthogonal coordinate system (for example, a Cartesian coordinate system), and may be interpreted in a broader sense than the aforementioned three axes in an orthogonal coordinate system. For example, the x-axis, y-axis, and z-axis may be axes that are orthogonal to each other, or may be axes that are in different directions that are not orthogonal to each other.
Hereinafter, compounds according to embodiments and light-emitting devices according to embodiments will be described in detail with reference to the Synthesis Examples and the Examples. The expression “B was used instead of A” used in describing the Synthesis Examples means that an identical molar equivalent of B was used in place of A.
10.4 g (45.0 mmol) of 1-bromo-4-methoxy-2-nitrobenzene, 9.4 g (54.0 mmol) of (2-chloro-3-fluorophenyl)boronic acid, 2.6 g (2.3 mmol) of tetrakis(triphenylphosphine)palladium, and 12.5 g (90.0 mmol) of potassium carbonate were put in a reaction vessel and suspended in 450 ml of a mixed solution of tetrahydrofuran and water mixed in a volume ratio of 3:1. The reaction mixture was heated and stirred at 80° C. for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 9.0 g (32 mmol) of Intermediate [12-A].
9.0 g (32.0 mmol) of Intermediate [12-A] and 25.2 g (96.0 mmol) of triphenylphosphine were put in a reaction vessel and suspended in 320 ml of ODCB. The reaction mixture was heated and stirred at 180° C. for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 4.9 g (19 mmol) of Intermediate [12-B].
4.9 g (19.5 mmol) of Intermediate [12-B], 6.3 g (29.3 mmol) of 2-bromo-4-(tert-butyl)pyridine, 0.9 g (1.0 mmol) of tris(dibenzylidene acetone)dipalladium, 0.8 g (2.0 mmol) of SPhos, and 3.7 g (39.0 mmol) of sodium tert-butoxide were put in a reaction vessel and suspended in 200 ml of toluene. The reaction temperature was raised to 110° C., and the reaction mixture was stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 5.4 g (14.2 mmol) of Intermediate [12-C].
14.8 g (60 mmol) of 1-bromo-9H-carbazole, 39.6 g (120 mmol) of 1,2-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-Abenzene, 3.5 g (3.0 mmol) of tetrakis(triphenylphosphine)palladium, and 16.6 g (120.0 mmol) of potassium carbonate were put in a reaction vessel and suspended in 600 ml of a mixed solution of tetrahydrofuran and water mixed in a volume ratio of 3:1. The reaction mixture was heated and stirred at 80° C. for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 9.6 g (26 mmol) of Intermediate [12-D].
The term “pin” refers to pinacolato.
5.4 g (14.2 mmol) of Intermediate [12-C], 9.6 g (26.0 mmol) of Intermediate [12-D], 0.5 g (0.7 mmol) of SPhos Pd G2, and 3.9 g (28.4 mmol) of potassium carbonate were put in a reaction vessel and suspended in 140 ml of toluene. The reaction mixture was heated and stirred at 100° C. for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 5.1 g (8.7 mmol) of Intermediate [12-E].
5.1 g (8.7 mmol) of Intermediate [12-E] and 5.7 g (17.4 mmol) of cesium carbonate were put in a reaction vessel and suspended in 90 ml of DMSO. The reaction mixture was heated, and stirred at 160° C. for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 3.5 g (6.1 mmol) of Intermediate [12-F].
3.5 g (6.1 mmol) of Intermediate [12-F] was suspended in an excess of bromine acid. The reaction mixture was heated to a temperature of 120° C. and stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, neutralized by adding an aqueous sodium bicarbonate solution thereto, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 2.8 g (5.1 mmol) of Intermediate [12-G].
2.8 g (5.1 mmol) of Intermediate [12-G], 2.8 g (10.2 mmol) of 1-(3-bromophenyl)-1H-benzo[d]imidazole, 2.2 g (10.2 mmol) of potassium phosphate tribasic, 0.1 g (0.5 mmol) of iodo copper, and 0.1 g (1.0 mmol) of picolinic acid were put in a reaction vessel and suspended in 50 ml of dimethylsulfoxide. The reaction mixture was heated, and stirred at the temperature of 160° C. for 24 hours. After completion of the reaction, the reaction result was cooled at room temperature, 100 ml of distilled water was added thereto, and an extraction process was performed thereon by using ethyl acetate. The extracted organic layer was washed with a saturated aqueous sodium chloride solution and dried by using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 2.8 g (3.8 mmol) of Intermediate [12-H].
2.8 g (3.8 mmol) of Intermediate [12-H] and 1.6 g (11.4 mmol) of iodomethane were put in a reaction vessel and suspended in 40 ml of toluene. The reaction mixture was heated to a temperature of 110° C. and stirred for 12 hours. After the reaction, the reaction mixture was cooled to room temperature, and a solid obtained by removing a portion of the solution therefrom and adding distilled water thereto was filtered. The filtered solid was purified using a recrystallization process to obtain 2.8 g (3.2 mmol) of Intermediate [12-I].
2.8 g (3.2 mmol) of Intermediate [12-I] and 1.6 g (9.6 mmol) of ammonium hexafluorophosphate were put in a reaction vessel and suspended in a solution of methanol and water in a volume ratio of 2:1. The reaction mixture was stirred at room temperature for 12 hours. The obtained solid was filtered using a recrystallization process to obtain 2.3 g (2.5 mmol) of Intermediate [12-J].
Synthesis of Compound 12
2.3 g (2.5 mmol) of Intermediate [12-J], 1.0 g (2.8 mmol) of dichloro(1,5-cyclooctadiene)platinum, and 0.6 g (7.5 mmol) of sodium acetate were suspended in 100 ml of dioxane. The reaction mixture was heated, and stirred at 110° C. for 72 hours. After completion of the reaction, the reaction result was cooled at room temperature, and 100 ml of distilled water was added thereto and an extraction process was performed thereon by using ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 190 mg (0.2 mmol) of Compound 12.
190 mg (0.2 mmol) of Compound 13 was obtained in the same manner as in Synthesis Example 1 except that iodomethane-D3 was used instead of iodomethan-H3.
2.8 g (3.8 mmol) of Intermediate [12-H], 2.5 g (5.7 mmol) of diphenyliodonium hexafluorophosphate-D10, and 70 mg (0.4 mmol) of copper acetate were suspended in 40 ml of dimethylformamide. The reaction mixture was heated to a temperature of 120° C. and stirred for 12 hours. After completion of the reaction, the reaction result was cooled at room temperature, and 100 ml of distilled water was added thereto and an extraction process was performed thereon by using ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 2.4 g (2.4 mmol) of Intermediate [15-A].
Synthesis of Compound 15
2.4 g (2.4 mmol) of Intermediate [15-A], 1.0 g (2.6 mmol) of dichloro(1,5-cyclooctadiene)platinum, and 0.6 g (7.2 mmol) of sodium acetate were suspended in 100 ml of dioxane. The reaction mixture was heated, and stirred at 110° C. for 72 hours. After completion of the reaction, the reaction result was cooled at room temperature, and 100 ml of distilled water was added thereto and an extraction process was performed thereon by using ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 200 mg (0.2 mmol) of Compound 15.
2.8 g (5.1 mmol) of Intermediate [12-G], 1.8 g (10.2 mmol) of 1-bromo-3-fluorobenzene, and 2.2 g (10.2 mmol) of potassium phosphate tribasic were put in a reaction vessel and suspended in 50 ml of dimethylsulfoxide. The reaction mixture was heated to a temperature of 160° C. and stirred for 24 hours. After completion of the reaction, the reaction result was cooled at room temperature, 100 ml of distilled water was added thereto, and an extraction process was performed thereon by using ethyl acetate. The extracted organic layer was washed with a saturated aqueous sodium chloride solution and dried by using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 2.5 g (3.5 mmol) of Intermediate [20-A].
2.5 g (3.5 mmol) of Intermediate [20-A], 1.5 g (4.2 mmol) of N1-([1,1′:3′, 1″-terphenyl]-2′-yl-2,2″, 3,3″, 4,4″, 5,5″, 6,6″-d10)benzene-1,2-diamine, 0.2 g (0.2 mmol) of tris(dibenzylidene acetone)dipalladium, 0.2 g (0.4 mmol) of SPhos, and 0.7 g (7.0 mmol) of sodium tert-butoxide were put in a reaction vessel and suspended in 35 ml of toluene. The reaction temperature was raised to 110° C., and the reaction mixture was stirred for 3 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 2.7 g (2.8 mmol) of Intermediate [20-B].
2.7 g (2.8 mmol) of Intermediate [20-B], 18.7 ml (140 mmol) of triethylorthoformate, and 1.2 ml (14.0 mmol) of HCl 35 wt % solution were put in a reaction vessel and heated to a temperature of 80° C. and stirred for 12 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and a residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 2.1 g (2.1 mmol) of Intermediate [20-C].
2.1 g (2.1 mmol) of Intermediate [20-C] and 0.7 g (4.2 mmol) of ammonium hexafluorophosphate were put in a reaction vessel and suspended in a solution of methanol and water in a volume ratio of 2:1. The reaction mixture was stirred at room temperature for 12 hours. The obtained solid was filtered, and separated by column chromatography to obtain 2.0 g (1.8 mmol) of Intermediate [20-D1].
Synthesis of Compound 20
2.0 g (1.8 mmol) of Intermediate [20-D], 0.7 g (2.0 mmol) of dichloro(1,5-cyclooctadiene)platinum, and 0.3 g (3.6 mmol) of sodium acetate were suspended in 70 ml of dioxane. The reaction mixture was heated, and stirred at 110° C. for 72 hours. After completion of the reaction, the reaction mixture was cooled to room temperature, and extracted with ethyl acetate. An organic layer extracted therefrom was washed with a saturated aqueous sodium chloride solution, and dried using sodium sulfate. A residue obtained by removing the solvent therefrom was separated by column chromatography to obtain 0.2 g (0.2 mmol) of Compound 20.
Compound 110 was obtained in the same manner as in Synthesis Example 1 except that 2-chloro-3-fluoro-7-methoxy-9H-carbazole was used instead of Intermediate [12-B].
By using the method in Table 1, the HOMO and LUMO values of the compounds synthesized according to the Synthesis Examples and Compound CE were measured, and results thereof are shown in Table 2.
PMMA and Compound 12 (4 wt % compared to PMMA) were mixed in CH2Cl2 solution, and the resultant obtained therefrom was coated on a quartz substrate using a spin coater, and heat treated in an oven at 80° C., followed by cooling to room temperature to manufacture Film 1 having a thickness of 40 nm. Films 2 to 6 were manufactured in the same manner as used to manufacture Film 1, except that Compounds 13, 15, 20, 110, and CE were used for Films 2 to 6, respectively, instead of Compound 12.
An emission spectrum of each of Films 1 to 6 was measured using a Quantaurus-QY Absolute PL quantum yield spectrometer of Hamamatsu company (on which a xenon light source, a monochromator, a photonic multichannel analyzer, and an integrating sphere are mounted and which includes PLQY measurement software (Hamamatsu Photonics, Ltd., Shizuoka, Japan). During the measurement, an excitation wavelength was scanned from 320 nm to 380 nm at intervals of 10 nm, and a spectrum measured at the excitation wavelength of 340 nm was taken to obtain a maximum emission wavelength (emission peak wavelength) and FWHM of an organometallic compound included in each film, which were shown in Table 3 below.
The PLQY of each of Films 1 to 6 was measured by using Quantaurus-QY Absolute PL quantum yield spectrometer of Hamamatsu company, wherein an excitation wavelength was scanned from 300 nm to 380 nm at intervals of 10 nm, and the PLQY measured at the excitation wavelength of 330 nm was taken to obtain the PLQY of an organometallic compound included in each film, which are shown in Table 3
From Table 3, it can be seen that the film including Compounds 12, 13, 15, 20, or 110 represented by Formula 1 may have excellent PLQY as compared with the film including Compound CE, and may emit blue light having a small FWHM.
A glass substrate (available from Corning Co., Ltd) on which an ITO anode (15 Ohms per square centimeter (Ω/cm2)) having a thickness of 1,200 Å was formed was cut to a size of 50 mm×50 mm×0.7 mm, sonicated in isopropyl alcohol and pure water for 5 minutes in each solvent, cleaned with ultraviolet rays for 30 minutes, and cleaned with ozone, and was mounted on a vacuum deposition apparatus.
2-TNATA was vacuum-deposited on the anode to form a hole injection layer having a thickness of 600 Å. 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (hereinafter referred to as NPB) was vacuum-deposited on the hole injection layer to form a hole transport layer having a thickness of 300 Å.
Compound 12, Compound ETH2, and Compound HTH29 were vacuum-deposited on the hole transport layer to form an emission layer having a thickness of 350 Å. The amount of Compound 12 was 13 parts by weight, based on 100 parts by weight of the emission layer. The weight ratio of Compound ETH2 and Compound HTH29 was 3.5:6.5.
Compound HBL-1 was vacuum-deposited on the emission layer to form a hole blocking layer having a thickness of 50 Å.
CNNPTRZ and LiQ were vacuum-deposited on the hole blocking layer to form an electron transport layer having a thickness of 310 Å. The weight ratio of CNNPTRZ and LiQ was 4:6.
Yb was vacuum-deposited on the electron transport layer to form an electron injection layer having a thickness of 15 Å.
Mg was vacuum-deposited on the electron injection layer to form a cathode with a thickness of 800 Å, thereby completing the formation of a photoelectric device.
Light-emitting devices were manufactured in the same manner as in Example 1, except that compounds described in Table 4 were each used instead of Compound 12 in the formation of the emission layer.
A light-emitting device was manufactured in the same manner as in Example 4, except that Compound DFD7 was deposited together with Compounds 20, ETH2, and HTH29 when forming the emission layer. The amount of Compound DFD7 was 0.4 parts by weight, based on 100 parts by weight of the emission layer.
A light-emitting device was manufactured in the same manner as in Example 5 except that Compound DFD29 of 1.2 parts by weight based on 100 parts by weight of the emission layer was used instead of Compound DFD7 in forming the emission layer.
Driving voltage (V) at 1,000 cd/m2, color purity (ClEx,y), luminescence efficiency (cd/A), color conversion efficiency (cd/A/y), maximum emission wavelength (nm), and lifespan (T95) of the light-emitting devices manufactured in Examples 1 to 7 and Comparative Example 1 were each measured using a Keithley MU 236 and a luminance meter PR650, and results thereof are shown in Tables 4 and 5, respectively. The lifespan (T95) indicates a time (hr) spent for the luminance to reach 95% of its initial luminance.
Referring to the results of Table 5, the light-emitting devices of Examples 1 to 7 were each found to have a driving voltage and luminescence efficiency that are equal to or better than those of the light-emitting device of Comparative Example 1. The light-emitting devices of Examples 1 to 7 were each found to emit darker blue light and have excellent color conversion efficiency and longer lifespan as compared with the light-emitting device of Comparative Example 1.
According to the embodiments, since an organometallic compound represented by Formula 1 in which N(CY33)(CY34) is substituted into ring CY32 has excellent electric characteristics, a light-emitting device including the organometallic compound may have improved color purity, color conversion efficiency, and lifespan. Rigidity of the organometallic compound may be improved because rings CY32 and CY33 are linked to each other and/or rings CY32 and CY34 are linked to each other.
Embodiments have been disclosed herein, and although terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for the purposes of limitation. In some instances, as would be apparent by one of ordinary skill in the art, features, characteristics, and/or elements described in connection with an embodiment may be used singly or in combination with features, characteristics, and/or elements described in connection with other embodiments unless otherwise specifically indicated. Accordingly, it will be understood by those of ordinary skill in the art that various changes in form and details may be made without departing from the spirit and scope of the disclosure as set forth in the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0134454 | Oct 2022 | KR | national |
