Patent Application
20230380262
This application claims priority to and benefits of Korean Patent Application Nos. 10-2022-0063069 and 10-2022-0191039 under 35 U.S.C. § 119, filed on May 23, 2022 and Dec. 30, 2022, respectively, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.
Embodiments relate to a light-emitting device, an electronic device including the same, and an electronic apparatus including the same.
Self-emissive devices (for example, organic light-emitting devices) in light-emitting devices have wide viewing angles, high contrast ratios, short response times, and excellent characteristics in terms of luminance, driving voltage, and response speed.
In a light-emitting device, a first electrode is located on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode are sequentially arranged on the first electrode. Holes provided from the first electrode move toward the emission layer through the hole transport region, and electrons provided from the second electrode move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate 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 a light-emitting device having a low driving voltage and high power efficiency, an electronic device including the same, and an electronic apparatus including the same.
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 light-emitting device may include
In an embodiment, the HOMO energy level of the first material may be in a range of about −5.60 eV to about −4.80 eV.
In an embodiment, the HOMO energy level of the first host may be in a range of about −5.10 eV to about −4.50 eV.
In an embodiment, an absolute value of a difference between the HOMO energy level of the first emitter and the HOMO energy level of the first host may be in a range of about 0.01 eV to about 1.0 eV.
In an embodiment, the hole transport region may further include a second layer and a third layer; the second layer may be disposed between the first electrode and the first layer; the third layer may be disposed between the first electrode and the second layer; the second layer may include a second material; the third layer may include a third material; and the first material, the second material, and the third material may be different from each other.
In an embodiment, one of the following conditions may be satisfied:
In an embodiment, a HOMO energy level of the second material may be in a range of about −5.40 eV to about −4.70 eV; and the HOMO energy level of the second material may be a negative value measured by cyclic voltammetry.
In an embodiment, a HOMO energy level of the third material may be in a range of about −5.25 eV to about −4.50 eV; and the HOMO energy level of the third material may be a negative value measured by cyclic voltammetry.
In an embodiment, the hole transport region may further include a p-dopant.
In an embodiment, a HOMO energy level of the first emitter may be in a range of about −5.50 eV to about −4.00 eV.
In an embodiment, a peak wavelength of the first light may be in a range of about 510 nm to about 610 nm.
In an embodiment, a full width at half maximum of the first light may be in a range of about 15 nm to about 85 nm.
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, wherein the at least one of the first capping layer and the second capping layer may each independently include a material having a refractive index of greater than or equal to about 1.6 with respect to a wavelength of about 589 nm.
In an embodiment, the at least one of the first capping layer and the second capping layer may each independently include a material having a refractive index of greater than or equal to about 1.8 with respect to a wavelength of about 589 nm.
In an embodiment, the first emitter may be an organometallic compound that includes platinum, and a first ligand bound to the platinum; and the first emitter may satisfy at least one of Conditions A to C, which are explained below.
In an embodiment, the first emitter may be an organometallic compound that includes iridium, and a first ligand, a second ligand, and a third ligand, each bonded to the iridium; the first ligand may be a bidentate ligand comprising Y1-containing ring B1 and Y2-containing ring B2; the second ligand may be a bidentate ligand including Y3-containing ring B3 and Y4-containing ring B4; the third ligand may be a bidentate ligand comprising Y5-containing ring B5 and Y6-containing ring B6; ring B1 to ring B6 may each independently be a C3-C60 carbocyclic group or a C1-C60 heterocyclic group; Y1, Y3, and Y5 may each be nitrogen (N); Y2, Y4, and Y6 may each be carbon (C); and Y2-containing ring B2 and Y4-containing ring B4 may be different from each other.
According to embodiments, an electronic device may include the light-emitting device.
In an embodiment, the electronic device may further include a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof.
According to embodiments, an electronic apparatus may include the light-emitting device.
In an embodiment, the electronic apparatus may be a flat panel display, a curved display, a computer monitor, a medical monitor, a 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 phone, a cell phone, a tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a microdisplay, 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 signage.
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.
A light-emitting device according to an embodiment may include a first electrode, a second electrode facing the first electrode, and an interlayer disposed between the first electrode and the second electrode.
The interlayer may include a hole transport region and an emission layer, and the hole transport region may be disposed between the first electrode and the emission layer.
The hole transport region may include a first layer, and the first layer may directly contact the emission layer.
In an embodiment, a first electrode, a first layer, an emission layer, and a second electrode in the light-emitting devices may be sequentially stacked.
The emission layer may include a first host and a first emitter, and the first emitter may emit first light having a first emission spectrum.
The first layer may include a first material.
An absolute value of a difference between a HOMO energy level of the first material and a HOMO energy level of the first host may be in a range of about 0 eV to about 0.20 eV, about 0 eV to about 0.15 eV, about 0 eV to about 0.10 eV, about 0.01 eV to about 0.20 eV, about 0.01 eV to about 0.15 eV, about 0.01 eV to about 0.10 eV, about 0.03 eV to about 0.20 eV, about 0.03 eV to about 0.15 eV, or about 0.03 eV to about 0.10 eV.
In an embodiment, the HOMO energy level of the first material may be in a range of about −5.60 eV to about −4.80 eV. For example, the HOMO energy level of the first material may be in a range of about −5.40 eV to about −4.80 eV, about −5.20 eV to about −4.80 eV, about −5.00 eV to about −4.80 eV, about −5.60 eV to about −4.90 eV, about −5.40 eV to about −4.90 eV, about −5.20 eV to about −4.90 eV, or about −5.00 eV to about −4.90 eV.
According to an embodiment, a hole mobility of the first material may be in a range of about 6.80×10−5 cm2/Vs to about 1.85×10−3 cm2/Vs. For example, the hole mobility of the first material may be in a range of about 1.00×10−4 cm2/Vs to about 1.70×10−3 cm2/Vs.
The hole mobility and electron mobility of each of a third material, a second material, a first material, a first host, a buffer layer material, an electron transport layer material, etc. are evaluated by using a space-charge-limited current (SCLC) method described in “Hole mobility of N,N′-bis(naphtanlen-1-yl)-N,N′-bis(phenyl)benzidine investigated by using space-charge-limited currents, ‘Appl. Phys. Lett. 90, 203512 (2007).”
According to an embodiment, the HOMO energy level of the first host may be in a range of about −5.10 eV to about −4.50 eV. For example, the HOMO energy level of the first host may be in a range of about −5.10 eV to about −4.60 eV, about −5.10 eV to about −4.70 eV, about −5.10 eV to about −4.80 eV, about −5.00 eV to about −4.50 eV, −5.00 eV to about −4.60 eV, about −5.00 eV to about −4.70 eV, or about −5.00 eV to about −4.80 eV.
In an embodiment, the hole mobility of the first host may be in a range of about 5.01×10−5 cm2/Vs to about 5.60×10−3 cm2/Vs. For example, the hole mobility of the first host may be in a range of about 2.00×10−4 cm2/Vs to about 3.00×10−3 cm2/Vs.
In an embodiment, a lowest unoccupied molecular orbital (LUMO) energy level of the first host may be in a range of about −2.20 eV to about −2.00 eV. For example, the LUMO energy level of the first host may be in a range of about −2.15 eV to about −2.00 eV.
In an embodiment, the electron mobility of the first host may be in a range of about 1.97×10−7 cm2/Vs to about 2.30×10−4 cm2/Vs. For example, the electron mobility of the first host may be in a range of about 3.00×10−7 cm2/Vs to about 1.00×10−4 cm2/Vs.
An absolute value of the HOMO energy level of the first emitter may be greater than an absolute value of the HOMO energy level of the first host.
For example, an absolute value of a difference between the HOMO energy level of the first emitter and the HOMO energy level of the first host may be in a range of about 0.01 eV to about 1.00 eV. For example, the absolute value of the difference between the HOMO energy level of the first emitter and the HOMO energy level of the first host may be in a range of about 0.01 eV to about 0.7 eV.
In an embodiment, the absolute value of the difference between the HOMO energy level of the first material and the HOMO energy level of the first host may be in a range of about 0 eV to about 0.20 eV, and the absolute value of the HOMO energy level of the first emitter may be greater than the absolute value of the HOMO energy level of the first host. Accordingly, injection of holes from the first electrode into the emission layer may be readily performed, and excitons may be effectively formed in the emission layer, so that the driving voltage and power efficiency characteristics of the light-emitting device can be improved.
According to an embodiment, the hole transport region may further include a second layer and a third layer. The second layer may be disposed between the first electrode and the first layer, and the third layer may be disposed between the first electrode and the first layer. The second layer may include a second material, and the third layer may include a third material. For example, the light-emitting device may further include a second layer and a third layer, and may have a structure in which the first electrode, the third layer, the second layer, the first layer, the emission layer, and the second electrode are sequentially stacked. In an embodiment, each of the first material, the second material, and the third material may be different from each other.
The light-emitting device may satisfy one of the following conditions:
In an embodiment, the HOMO energy level of the second material may be in a range of about −5.40 eV to about −4.70 eV. For example, the HOMO energy level of the second material may be in a range of about −5.30 eV to about −4.70 eV, about −5.20 eV to about −4.70 eV, about −5.10 eV to about −4.70 eV, about −5.40 eV to about −4.80 eV, about −5.30 eV to about −4.80 eV, about −5.20 eV to about −4.80 eV, or about −5.10 eV to about −4.80 eV.
According to an embodiment, the hole mobility of the second material may be in a range of about 6.80×10−5 cm2/Vs to about 1.85×10−3 cm2/Vs. For example, the hole mobility of the second material may be in a range of about 1.00×10−4 cm2/Vs to about 3.00×10−3 cm2/Vs.
In an embodiment, a LUMO energy level of the second material may be in a range of about −1.70 eV to about −0.90 eV. For example, the LUMO energy level of the second material may be in a range of about −1.51 eV to about −1.01 eV.
In an embodiment, a HOMO energy level of the third material may be in a range of about −5.25 eV to about −4.50 eV. For example, the HOMO energy level of the third material may be in a range of about −5.15 eV to about −4.50 eV, about −5.05 eV to about −4.50 eV, about −4.95 eV to about −4.50 eV, about −4.85 eV to about −4.50 eV, about −4.75 eV to about −4.50 eV, about −5.25 eV to about −4.60 eV, about −5.15 eV to about −4.60 eV, about −5.05 eV to about −4.60 eV, about −4.95 eV to about −4.60 eV, about −4.85 eV to about −4.60 eV, or about −4.75 eV to about −4.60 eV.
In an embodiment, the hole mobility of the third material may be in a range of about 6.20×10−5 cm2/Vs to about 1.25×10−3 cm2/Vs. For example, the hole mobility of the third material may be in a range of about 7.00×10−4 cm2/Vs to about 8.00×10−4 cm2/Vs.
In an embodiment, a LUMO energy level of the third material may be in a range of about −1.30 eV to about −0.90 eV. For example, the LUMO energy level of the third material may be in a range of about −1.28 eV to about −1.03 eV.
In an embodiment, an absolute value of a difference between the HOMO energy level of the third material and the HOMO energy level of the second material may be in a range of about 0.10 eV to about 0.70 eV. For example, the absolute value of the difference between the HOMO energy level of the third material and the HOMO energy level of the second material may be in a range of about 0.137 eV to about 0.686 eV.
In an embodiment, an absolute value of a difference between the HOMO energy level of the second material and the HOMO energy level of the first material may be in a range of about 0.40 eV to about 0.70 eV. For example, the absolute value of the difference between the HOMO energy level of the second material and the HOMO energy level of the first material may be in a range of about 0.412 eV to about 0.686 eV.
The HOMO energy levels used herein may be negative values measured by cyclic voltammetry. For example, an example of the HOMO energy level measurement method may be understood by referring to Evaluation Example 1 below.
As described above, the hole transport region including the first layer and optionally including the second layer and/or the third layer may further include a p-dopant. A description of the p-dopant will be described below.
In an embodiment, the HOMO energy level of the first emitter in the emission layer may be in a range of about −5.50 eV to about −4.00 eV. For example, the HOMO energy level of the first emitter may be in a range of about −5.50 eV to about −4.80 eV, about −5.45 eV to about −4.80 eV, about −5.50 eV to about −4.85 eV, about −5.45 eV to about −4.85 eV, about −5.50 eV to about −4.90 eV, or about −5.45 eV to about −4.90 eV.
In an embodiment, the LUMO energy level of the first emitter in the emission layers may be in a range of about −2.40 eV to about −2.00 eV. For example, the LUMO energy level of the first emitter in the emission layers may be in a range of about −2.20 eV to about −2.00 eV.
A triplet (T1) energy of the first emitter may be in a range of about 2.10 eV to about 2.60 eV. For example, the triplet energy of the first emitter may be in a range of about 2.20 eV to about 2.50 eV.
For the method of evaluating the triplet energy of the first emitter, Evaluation Example 1 of the application may be referred to.
A peak wavelength (maximum emission wavelength, or maximum emission peak wavelength) of the first light may be in a range of about 510 nm to about 610 nm.
For example, the peak wavelength of the first light may be in a range of about 510 nm to about 565 nm, about 510 nm to about 560 nm, about 510 nm to about 555 nm, about 510 nm to about 550 nm, about 510 nm to about 545 nm, about 510 nm to about 540 nm, about 515 nm to about 570 nm, about 515 nm to about 565 nm, about 515 nm to about 560 nm, about 515 nm to about 555 nm, about 515 nm to about 550 nm, about 515 nm to about 545 nm, about 515 nm to about 540 nm, about 520 nm to about 570 nm, about 520 nm to about 565 nm, about 520 nm to about 560 nm, about 520 nm to about 555 nm, about 520 nm to about 550 nm, about 520 nm to about 545 nm, about 520 nm to about 540 nm, about 525 nm to about 570 nm, about 525 nm to about 565 nm, about 525 nm to about 560 nm, about 525 nm to about 555 nm, about 525 nm to about 550 nm, about 525 nm to about 545 nm, or about 525 nm to about 540 nm.
A full width at half maximum (FWHM) of the first light may be in a range of about 15 nm to about 85 nm.
For example, the FWHM of the first light may be in a range of about 20 nm to about 85 nm, about 25 nm to about 85 nm, about 30 nm to about 85 nm, about 35 nm to about 85 nm, about 40 nm to about 85 nm, about 45 nm to about 85 nm, about 50 nm to about 85 nm, about 15 nm to about 80 nm, about 20 nm to about 80 nm, about 25 nm to about 80 nm, about 30 nm to about 80 nm, about 35 nm to about 80 nm, about 40 nm to about 80 nm, about 45 nm to about 80 nm, about 50 nm to about 80 nm, about 15 nm to about 75 nm, about 20 nm to about 75 nm, about 25 nm to about 75 nm, about 30 nm to about 75 nm, about 35 nm to about 75 nm, about 40 nm to about 75 nm, about 45 nm to about 75 nm, about 50 nm to about 75 nm, about 15 nm to about 70 nm, about 20 nm to about 70 nm, about 25 nm to about 70 nm, about 30 nm to about 70 nm, about 35 nm to about 70 nm, about 40 nm to about 70 nm, about 45 nm to about 70 nm, about 50 nm to about 70 nm, about 15 nm to about 65 nm, about 20 nm to about 65 nm, about 25 nm to about 65 nm, about 30 nm to about 65 nm, about 35 nm to about 65 nm, about 40 nm to about 65 nm, about 45 nm to about 65 nm, about 50 nm to about 65 nm, about 15 nm to about 60 nm, about 20 nm to about 60 nm, about 25 nm to about 60 nm, about 60 nm to about 60 nm, about 35 nm to about 60 nm, about 40 nm to about 60 nm, about 45 nm to about 60 nm, or about 50 nm to about 60 nm.
The peak wavelength (or maximum emission wavelength) and FWHM of the first light described in the specification may be evaluated from the emission spectrum of a film including the first emitter (for example, see Evaluation Example 2). The peak wavelength in the specification may be a peak wavelength having a maximum emission intensity in the emission spectrum or electroluminescence spectrum.
The first light may be a green light.
The first emitter may be a transition metal-containing organometallic compound.
The first emitter may be a platinum-containing organometallic compound. In an embodiment, the first emitter may be neutral, may include one platinum, and may not include a transition metal other than platinum.
A triplet metal-to-ligand charge transfer state (3MLCT) of the platinum-containing organometallic compound may be greater than or equal to about 7%.
For example, the 3MLCT of the platinum-containing organometallic compound may be in a range of about 7% to about 30%, about 7% to about 25%, about 7% to about 20%, about 7% to about 18%, about 7% to about 16%, about 8% to about 30%, about 8% to about 25%, about 8% to about 20%, about 8% to about 18%, about 8% to about 16%, about 9% to about 30%, about 9% to about 25%, about 9% to about 20%, about 9% to about 18%, or about 9% to about 16%.
According to an embodiment, the platinum-containing organometallic compound may further include a first ligand bonded to the platinum in addition to the platinum.
In an embodiment, the platinum-containing organometallic compound may satisfy at least one of Conditions A to C:
[Condition A]
The first ligand is a tetradentate ligand, and
a number of cyclometallated rings formed by a chemical bond between the platinum and the first ligand is three.
[Condition B]
Each of carbon, nitrogen, and oxygen of the first ligand is chemically bonded to the platinum.
[Condition C]
The first ligand includes an imidazole group, a benzimidazole group, a naphthoimidazole group, or any combination thereof.
In an embodiment, the platinum-containing organometallic compound may satisfy both Condition A to Condition C.
The platinum-containing organometallic compound may be understood by referring to the description to be provided below.
In an embodiment, the first emitter may be an iridium-containing organometallic compound. The first emitter may be neutral, may include one iridium, and may not include a transition metal other than iridium.
For example, the iridium-containing organometallic compound may include a first ligand, a second ligand, and a third ligand which are each bonded to iridium. In an embodiment, the first ligand may be a bidentate ligand including Y1-containing ring B1 and Y2-containing ring B2, the second ligand may be a bidentate ligand including Y3-containing ring B3 and Y4-containing ring B4, the third ligand may be a bidentate ligand including Y5-containing ring B5 and Y6-containing ring B6, each of Y1, Y3 and Y5 may be nitrogen (N), and each of Y2, Y4 and Y6 may be carbon (C).
In an embodiment, Y2-containing ring B2 and Y4-containing ring B4 may be different from each other.
In embodiments, Y2-containing ring B2 may be a polycyclic group. For example, Y2-containing ring B2 may be a polycyclic group in which three or more monocyclic groups (for example, 3 to 15 monocyclic groups) are condensed with each other. The monocyclic group may be, for example, a furan group, a thiophene group, a selenophene group, a pyrrole group, a cyclopentadiene group, a silole group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, or a pyridazine group. In an embodiment, Y2-containing ring B2 may be a monocyclic group as described above.
In an embodiment, Y2-containing ring B2 may be a polycyclic group in which a 5-membered monocyclic group (for example, a furan group, a thiophene group, a selenophene group, a pyrrole group, a cyclopentadiene group, a silole group, etc.) is condensed with at least two 6-membered monocyclic groups (for example, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, etc.)
In an embodiment, Y4-containing ring B4 may be a monocyclic group. For example, Y4-containing ring B4 may be a 6-membered monocyclic group (for example, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, etc.).
In an embodiment, Y4-containing ring B4 may be a naphthalene group, a phenanthrene group, or an anthracene group.
In an embodiment, the iridium-containing organometallic compound may be a homoleptic complex. For example, the first ligand, second ligand, and third ligand may be the same as each other.
In an embodiment, the iridium-containing organometallic compound may be a heteroleptic complex.
In an embodiment, the third ligand and the second ligand may be identical.
In an embodiment, the third ligand and the first ligand may be identical.
In an embodiment, the third ligand may be different from each of the first ligand and the second ligand.
The iridium-containing organometallic compound may be understood by referring to the description to be provided below.
In an embodiment, the first emitter may include at least one deuterium.
In an embodiment, the first host may include at least one deuterium.
In an embodiment, the first host may include a spiro[fluorene-9,9′-xanthene]group, a spiro[fluorene-9,9′-thioxanthene] group, a phenoxazine group, a phenothiazine group, an indoline group, a 1,2,3,3a,4,8b-hexahydrocyclopenta[b]indole group, 2,3,4,4a,9,9a-hexahydro-1H-carbazole group, a C1-C30 alkoxy group, a di[(C1-C30 alkoxy)phenyl]amino group, or a combination thereof.
In an embodiment, the first host may be an electron-transporting compound, a hole-transporting compound, a bipolar compound, or a combination thereof. The first host may not include metal. The electron-transporting compound, the hole-transporting compound, and the bipolar compound may be different from each other.
In an embodiment, an electron-transporting compound may include at least one π electron-deficient nitrogen-containing C1-C60 cyclic group. In an embodiment, the electron-transporting 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 first host may be an electron-transporting compound, or may include an electron-transporting compound, and an electron-transporting compound may include:
In an embodiment, the first host (or the electron-transporting compound) may include:
In an embodiment, the hole-transporting compound may include at least one π electron-rich C3-C60 cyclic group, a pyridine group, or a combination thereof, and may not include an electron-transporting group (for example, a π electron-deficient nitrogen-containing C1-C60 cyclic group excluding a pyridine group, a cyano group, a sulfoxide group, and a phosphine oxide group).
In an embodiment, the hole-transporting compound may not be CBP or mCBP.
For example, the first host may be a hole-transporting compound, or may include a hole-transporting compound, and a hole-transporting compound may include:
In an embodiment, an electron-transporting compound may include a compound represented by Formula 2-1:
In Formula 2-1,
For example, at least one of R51 to R53 may be: a spiro[fluorene-9,9′-xanthene]group; a spiro[fluorene-9,9′-thioxanthene] group; a phenoxazine group; a phenothiazine group; or —N(Q1)(Q2)(wherein Q1 and Q2 may each independently be a C6-C20 aryl group substituted with at least one C1-C30 alkoxy group (for example, a phenyl group substituted with at least one C1-C30 alkoxy group).
In an embodiment, the hole-transporting 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, a compound represented by Formula 3-6, or any combination thereof:
In Formulae 3-1 to 3-6,
In an embodiment, the hole-transporting compound may be a compound represented by Formula 3-1 or a compound represented by Formula 3-6. In Formulae 3-1 and 3-6, L81 may be a π electron-rich C3-C60 cyclic group unsubstituted or substituted with R10a (for example, a benzene group, a naphthalene group, a fluorene group, an anthracene group, a carbazole group, a dibenzofuran group, a dibenzothiophene group, etc., each unsubstituted or substituted with R10a), a81 may be 1 or 2, ring CY71 and ring CY73 may each independently be a cyclopentane group or a cyclohexane group, and ring CY72 and CY74 may each be a benzene group.
In an embodiment, the emission layer may further include, in addition to the first emitter and the first host, an auxiliary dopant, a sensitizer, a delayed fluorescence material, or a combination thereof. Each of the auxiliary dopant, the sensitizer, the delayed fluorescence material, or any combination thereof may include at least one deuterium.
The term “interlayer” as used herein may be a single layer and/or all layers between the first electrode and the second electrode of the light-emitting device.
Another embodiment provides an electronic device including the light-emitting device. The electronic device may further include a thin-film transistor. In an embodiment, the electronic device may include a thin-film transistor including a source electrode and a drain electrode, and 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 device may further include a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof. For more details on the electronic device, related descriptions provided herein may be referred to.
Another embodiment provides an electronic apparatus including the light-emitting device. By using a light-emitting device having an emission layer and a first layer as described in the specification, the quality, power consumption, durability, and the like of the electronic apparatus may be improved.
For example, the electronic apparatus may be one of a flat panel display, a curved display, a computer monitor, a medical monitor, a TV, a billboard, indoor or outdoor illuminations and/or signal light, a head-up display, a fully or partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a phone, a cell phone, a tablet, a phablet, a personal digital assistant (PDA), a wearable device, laptop computers, digital cameras, camcorders, viewfinders, micro displays, 3D displays, virtual or augmented reality displays, vehicles, a video wall including multiple displays tiled together, a theater or stadium screen, a phototherapy device, and a signage.
[Descriptions of Formulae]
In an embodiment, a platinum-containing organometallic compound may be an organometallic compound represented by Formula 10:
In Formula 10,
In embodiments, in Formula 10,
In embodiments, in Formula 10,
In embodiments, in Formula 10,
In an embodiment, in Formula 10, T1 to T3 may each be a single bond.
In an embodiment, in Formula 10, ring CY1 may be a benzene 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 10, ring CY2 may be an imidazole group, a benzimidazole group, a naphthoimidazole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a quinoline group, an isoquinoline group, or a quinoxaline group.
In an embodiment, in Formula 10, ring CY3 may be a benzene group, a naphthalene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, a fluorene group, a dibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a quinoline group, an isoquinoline group, a quinoxaline group, an azadibenzofuran group, an azadibenzothiophene group, an azacarbazole group, an azafluorene group, or an azadibenzosilole group.
In an embodiment, in Formula 10, ring CY4 may be a benzene group, a naphthalene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, a fluorene group, a dibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a quinoline group, an isoquinoline group, a quinoxaline group, an azadibenzofuran group, an azadibenzothiophene group, an azacarbazole group, an azafluorene group, an azadibenzosilole group, an imidazole group, a benzimidazole group, or a naphthoimidazole group.
In an embodiment, in Formula 10, at least one of ring CY2 and ring CY4 may each independently be an imidazole group, a benzimidazole group, or a naphthoimidazole group.
In an embodiment, in Formula 10, R1 to R7, R5a, R5b, R6a, R6b, R7a, R7b, R′, and R″ may each independently be:
In Formula 10, a1 to a4 may respectively indicate the number of R1, the number of R2, the number of R3, and the number of R4, and a1 to a4 may each independently be 0, 1, 2, 3, 4, 5, or 6.
In embodiments, in Formula 10, a moiety represented by
may be a moiety represented by one of CY1(1) to CY1 (16):
In Formulae CY1(1) to CY1(16),
In embodiments, in Formula 10, a moiety represented by
may be a moiety represented by one of CY2(1) to CY2(21):
In Formulae CY2(1) to CY2(21),
Formulae CY2(1) to CY2(4) are embodiments of a moiety represented by
wherein X2 is nitrogen, and Formulae CY2(5) to CY2(13) are embodiments of a moiety represented by
wherein X2 is carbon (for example, a carbon of a carbene moiety).
In embodiments, in Formula 10, a moiety represented by
may be a moiety represented by one of CY3(1) to CY3(12):
In Formulae CY3(1) to CY3(12),
In embodiments, in Formula 10, a moiety represented by
may be a moiety represented by one of CY4(1) to CY4(27):
In Formulae CY4(1) to CY4(27),
In an embodiment, the iridium-containing organometallic compound may be an organometallic compound represented by Formula 1:
Ir(L1)(L2)(L3) [Formula 1]
In Formula 1,
In Formulae 1-1 to 1-3,
In an embodiment, the organometallic compound represented by Formula 1 may be a heteroleptic complex.
In embodiments, in Formula 1,
In an embodiment, ring B1, ring B3, and ring B5 may each independently be:
In an embodiment, ring B2, ring B4, and ring B6 may each independently be:
In an embodiment, ring B2 may be a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, or a pyridazine group, to which a cyclopentane group, a cyclohexane group, a norbornane group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a furan group, a thiophene group, a selenophene group, a pyrrole group, a cyclopentadiene group, a silole group, or any combination thereof is condensed.
In an embodiment, ring B2 may be a polycyclic group in which one of a furan group, a thiophene group, a selenophene group, a pyrrole group, a cyclopentadiene group, and a silole group is condensed with at least two of a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, and a pyridazine group.
In an embodiment, ring B2 may be a dibenzofuran group, a dibenzothiophene group, a dibenzoselenophene group, a carbazole group, a fluorene group, a dibenzosilole group, a naphthobenzofuran group, a naphthobenzothiophene group, a naphthobenzoselenophene group, a benzocarbazole group, a benzofluorene group, a benzodibenzosilole group, a dinaphthofuran group, a dinaphthothiophene group, a dinaphthoselenophene group, a dibenzocarbazole group, a dibenzofluorene group, a dinaphthosilole group, a phenanthrenonbenzofuran group, a phenanthrenonbenzothiophene group, a phenanthrenobenzoselenophene group, a naphthocarbazole group, a naphthofluorene group, a phenanthrenobenzosilole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzoselenophene group, an azacarbazole group, an azafluorene group, an azadibenzosilole group, an azanaphthobenzofuran group, an azanaphthobenzothiophene group, an azanaphthobenzoselenophene group, an azabenzocarbazole group, an azabenzofluorene group, an azabenzodibenzosilole group, an azadinaphthofuran group, an azadinaphthothiophene group, an azadinaphthoselenophene group, an azadibenzocarbazole group, an azadibenzofluorene group, an azadinaphthosilole group, an azaphenanthrenonbenzofuran group, an azaphenanthrenonbenzothiophene group, an azaphenanthrenobenzoselenophene group, an azanaphthocarbazole group, an azanaphthofluorene group, or an azaphenanthrenobenzosilole group.
In an embodiment, ring B2 may be a dibenzofuran group, a dibenzothiophene group, a dibenzoselenophene group, a naphthobenzofuran group, a naphthobenzothiophene group, a naphthobenzoselenophene group, a dinaphthofuran group, a dinaphthothiophene group, a dinaphthoselenophene group, a phenanthrenonbenzofuran group, a phenanthrenonbenzothiophene group, a phenanthrenonbenzoselenophene group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzoselenophene group, an azanaphthobenzofuran group, an azanaphthobenzothiophene group, an azanaphthobenzoselenophene group, an azadinaphthofuran group, an azadinaphthothiophene group, an azadinaphthoselenophene group, an azaphenanthrenonbenzofuran group, an azaphenanthrenonbenzothiophene group, or an azaphenanthrenonbenzoselenophene group.
In an embodiment, ring B4 may be a benzene group, a naphthalene group, a phenanthrene group, an anthracene group, a pyridine group, a pyrimidine group, a pyrazine group, or a pyridazine group.
In an embodiment, ring B6 may be a benzene group, a naphthalene group, a phenanthrene group, an anthracene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a dibenzofuran group, a dibenzothiophene group, a dibenzoselenophene group, a carbazole group, a fluorene group, a dibenzosilole group, a naphthobenzofuran group, a naphthobenzothiophene group, a naphthobenzoselenophene group, a benzocarbazole group, a benzofluorene group, a benzodibenzosilole group, a dinaphthofuran group, a dinaphthothiophene group, a dinaphthoselenophene group, a benzocarbazole group, a dibenzofluorene group, a dinaphthosilole group, a phenanthrenobenzofuran group, a phenanthrenobenzothiophene group, a phenanthrenobenzoselenophene group, a naphthocarbazole group, a naphthofluorene group, a phenanthrenobenzosilole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzoselenophene group, an azacarbazole group, an azafluorene group, an azadibenzosilole group, an azanaphthobenzofuran group, an azanaphthobenzothiophene group, an azanaphthobenzoselenophene group, an azabenzocarbazole group, an azabenzofluorene group, an azabenzodibenzosilole group, an azadinaphthofuran group, an azadinaphthothiophene group, an azadinaphtho selenophene group, an azadibenzocarbazole group, an azadibenzofluorene group, an azadinaphthosilole group, an azaphenanthrenobenzofuran group, an azaphenanthrenobenzothiophene group, an azaphenanthrenobenzoselenophene group, an azanaphthocarbazole group, an azanaphthofluorene group, or an phenanthrenobenzosilole group.
In an embodiment, Y2-containing ring B2 of Formula 1-1 and Y4-containing ring B4 of Formula 1-2 may be different from each other.
In an embodiment, in Formula 1, W1 to W6 may each independently be:
In an embodiment, at least one of W1 to W6 may include at least one deuterium.
In an embodiment, at least one of W1 to W6 may be a deuterated C1-C20 alkyl group, or a deuterated C3-C10 cycloalkyl group.
The term “biphenyl group” as used herein may be a monovalent substituent having a structure in which two benzene groups are connected to each other through a single bond.
Examples of a C3-C10 cycloalkyl group as used herein may include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, and the like.
The term “deuterated” as used herein may be interpreted as fully deuterated or partially deuterated.
The term “fluorinated” as used herein may be interpreted as fully fluorinated or partially fluorinated.
In Formula 1, b1 to b6 may respectively indicate the numbers of W1 to W6, and may each independently be 0, 1, 2, 3, or 4. When b1 is 2 or more, two or more of W1 may be identical to or different from each other, when b2 is 2 or more, two or more of W2 may be identical to or different from each other, when b3 is 2 or more, two or more of W3 may be identical to or different from each other, when b4 is 2 or more, two or more of W4 may be identical to or different from each other, when b5 is 2 or more, two or more of W5 may be identical to or different from each other, and when b6 is 2 or more, two or more of W6 may be identical to or different from each other.
In an embodiment, the iridium-containing organometallic compound may be an organometallic compound represented by Formula 1A or an organometallic compound represented by Formula 1B:
In an embodiment, the iridium-containing organometallic compound may be an organometallic compound represented by Formula 1A-1, or an organometallic compound represented by Formula 1B-1:
In Formulae 1A, 1B, 1A-1, and 1B-1,
Since n in Formula 1A and 1A-1 is 1 or 2, Formulae 1A and 1A-1 may correspond to an organometallic compound in which the third ligand in Formula 1 is the same as the second ligand or the first ligand.
The organometallic compound represented by Formula 1B or Formula 1B-1 may be an organometallic compound having three different bidentate ligands, and may correspond to a compound represented by Formula 1 in which the third ligand is different from each of the first ligand and the second ligand.
In an embodiment, ring B21 in Formulae 1A and 1B may be a benzene group, a naphthalene group, a phenanthrene group, an anthracene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a benzoquinoline group, a benzoisoquinoline group, a benzoquinoxaline group, or a benzoquinazoline group.
According to another embodiment, ring B21 in Formulae 1A and 1B may be a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a benzoquinoline group, a benzoisoquinoline group, a benzo quinoxaline group, or a benzoquinazoline group.
In an embodiment, in Formulae 1A-1 and 1B-1, at least one of Y21 to Y26 may be N.
In an embodiment, in Formulae 1A-1 and 1B-1, at least one of Y23 to Y26 may be N.
In an embodiment, Y26 in Formulae 1A-1 and 1B-1 may be N.
In an embodiment, in Formulae 1A-1 and 1B-1, each of Y21 to Y25 may not be N, and Y26 may be N.
In an embodiment, in Formulae 1A, 1B, 1A-1, and 1B-1, each of Y11 to Y14, Y21, Y22, Y31 to Y34 and Y41 to Y44 may not be N.
In an embodiment, a moiety represented by
in Formula 1-1, a moiety represented by
in Formula 1-2, a moiety represented by
in Formula 1-3, a moiety represented by
in Formulae 1A, 1B, 1A-1, and 1B-1, a moiety represented by
in Formulae 1A, 1B, 1A-1, and 1B-1, and a moiety represented by
in Formulae 1B and 1B-1 may each independently be represented by one of Formulae BN-1 to BN-16:
In Formulae BN-1 to BN-16,
In an embodiment, a moiety represented by
in Formula 1-1, a moiety represented by
in Formula 1-2, and a moiety represented by
in Formula 1-3 may each independently be a moiety represented by one of Formulae BC-1 to BC-47:
In Formulae BC-1 to BC-47,
Formulae BC-1 to BC-47 may be substituted or unsubstituted with W2, W4, or W6 as described above, and may be readily understood with reference to the structures of Formulae 1-1, 1-2, and 1-3.
In an embodiment, a moiety represented by in Formula 1-1 may be a moiety represented by one of Formulae BC-6 to BC-47.
In an embodiment, a moiety represented by
in Formula 1-2 may be a moiety represented by one of Formulae BC-1 to BC-5.
In Formula 2-1, b51 to b53 may respectively indicate numbers of L51 to L53, and may each independently be an integer from 1 to 5. When b51 is 2 or more, two or more of L51 may be identical to or different from each other, when b52 is 2 or more, two or more of L52 may be identical to or different from each other, and when b53 is 2 or more, two or more of L53 may be identical to or different from each other. In an embodiment, b51 to b53 may each independently be 1 or 2.
In Formula 2-1, L51 to L53 may each independently be:
In Formula 2-1, X54 may be N or C(R54), X55 may be N or C(R55), X56 may be N or C(R56), and at least two of X54 to X56 may each be N. R54 to R56 are the same as described herein. In an embodiment, two or three of X54 to X56 may be N.
In the specification, R51 to R56, R71 to R76, R81 to R85, R82a, R82b, R83a, R83b, R84a, and R84b may each independently be hydrogen, deuterium, —F, —C1, —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, a C7-C60 aryl alkyl group unsubstituted or substituted with at least one R10a, a C2-C60 heteroaryl alkyl 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 and R10a are the same as described in the specification.
For example, R1 to R7, R5a, R5b, R6a, R6b, R7a, R7b, R′, and R″ in Formula 10; W1 to W6, W11 to W14, W21 to W27, W27a, W27b, W31 to W34, W41 to W44, W71 to W74, W80, W80a, and W80b in Formulae 1, 1A, 1B, 1A-1, 1B-1, BN-1 to BN-16, and BC-1 to BC-47; R51 to R56, R71 to R76, R81 to R85, R82a, R82b, R83a, R83b, R84a, and R84b in Formulae 2-1 and 3-1 to 3-6; and R10a may each independently be:
In Formula 91,
In an embodiment, in Formula 91,
In an embodiment, R1 to R7, R5a, R5b, R6a, R6b, R7a, R7b, R′, and R″ in Formula 10; W1 to W6, W11 to W14, W21 to W27, W27a, W27b, W31 to W34, W41 to W44, W71 to W74, W80, W80a, and W80b in Formulae 1, 1A, 1B, 1A-1, 1B-1, BN-1 to BN-16 and BC-1 to BC-47; R51 to R56, R71 to R76, R81 to R85, R82a, R82b, R83a, R83b, R84a, and R84b in Formulae 2-1 and 3-1 to 3-6; and R10a may each independently be hydrogen, deuterium, —F, a cyano group, a nitro group, —CH3, —CD3, —CD2H, —CDH2, —CF3, —CF2H, —CFH2, a group represented by one of Formulae 9-1 to 9-19, a group represented by one of Formulae 10-1 to 10-246, —C(Q1)(Q2)(Q3), —Si(Q1)(Q2)(Q3), or —P(═O)(Q1)(Q2)(wherein Q1 to Q3 are the same as described herein except that each of R10a and W71 to W74 may not be hydrogen).
In Formulae 9-1 to 9-19 and 10-1 to 10-246, * indicates a binding site to an adjacent atom, “Ph” represents a phenyl group, and “TMS” represents a trimethylsilyl group.
In Formulae 3-1 to 3-5, a71 to a74 may respectively indicate numbers of R71 to R74, and a71 to a74 may each independently be an integer from 0 to 20. When a71 is 2 or more, two or more of R71 may be identical to or different from each other, when a72 is 2 or more, two or more of R72 may be identical to or different from each other, when a73 is 2 or more, two or more of R73 may be identical to or different from each other, and when a74 is 2 or more, two or more of R74 may be identical to or different from each other. In an embodiment, a71 to a74 may each independently be an integer from 0 to 8. In Formula 3-6, a75 and a76 may respectively indicate the number of R75 and the number of R76, and a75 and a76 may each independently be an integer from 0 to 4.
In Formula 1, two or more of W1 in the number of b1 may optionally be bonded 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; two or more of W2 in the number of b2 may optionally be bonded 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; two or more of W3 in the number of b3 may optionally be bonded 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; two or more of W4 in the number of b4 may optionally be bonded 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; two or more of W5 in the number of b5 may optionally be bonded 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; and two or more of W6 in the number of b6 may optionally be bonded 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 Formulae 3-1 to 3-6, L81 to L85 may each independently be:
*—C(Q4)(Q5)-*′ or *—Si(Q4)(Q5)-*′; or
In an embodiment, the first emitter may be one of Compounds GD01 to GD25:
In an embodiment, the first host may be one of Host1 to Host4:
In an embodiment, the first material may be one of Compounds GI01 to GI09:
[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, for example, 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 that facilitates 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. In embodiments, 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 (AI), 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 130]
The interlayer 130 may be located on the first electrode 110. The interlayer 130 may include an emission layer 135.
The interlayer 130 may further include a hole transport region 131 between the first electrode 110 and the emission layer 135, and an electron transport region between the emission layer 135 and the second electrode 150.
The interlayer 130 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.
In an embodiment, the interlayer 130 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 two neighboring emitting units. When the interlayer 130 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 131 in Interlayer 130]
The hole transport region 131 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 131 may include a first layer as described in the specification. The hole transport region 131 may optionally include, in addition to the first layer, at least one of a second layer and a third layer.
When the hole transport region 131 includes a third layer, a second layer, and a first layer, the third layer, the second layer, and the first layer may be sequentially stacked on the first electrode 110. The first layer may directly contact the emission layer 135.
The hole transport region 131 may further include, in addition to the first layer, a hole injection layer, a hole transport layer, an emission auxiliary layer, an electron-blocking layer, or any combination thereof.
The hole transport region 131 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 first material, the second material, and the third material described in the specification may each be a compound that satisfies conditions as described in the specification (for example, the highest occupied molecular orbital (HOMO) energy level conditions, etc.) among the compounds represented by Formula 201 and the compounds represented by Formula 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 in Formulae CY201 to CY217 may each independently be the same as described in connection with 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.
In embodiments, 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 the 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.
A thickness of the hole transport region 131 may be in a range of about 50 Å to about 10,000 Å. For example, the thickness of the hole transport region 131 may be in a range of about 100 Å to about 4,000 Å. A thickness of the third layer may be in a range of about 20 Å to about 7,000 Å, a thickness of the second layer may be in a range of about 20 Å to about 4,000 Å, and a thickness of the first layer may be in a range of about 10 Å to about 4,000 Å. When the thickness of each of the hole transport region 131, the third layer, the second layer, and the first layer satisfies these ranges, satisfactory hole transport characteristics may be obtained without a substantial increase in driving voltage.
Compounds that may be included in the hole transport region 131, for example, examples of compounds that may be included in each of the first layer, the second layer, and the third layer may include Compounds HT01 to HT10, G′01 to G′10, and G101 to G109.
[p-Dopant]
The hole transport region 131 may further include, in addition to these materials, a charge-generation material for the improvement of conductive properties. The charge-generation material may be uniformly or non-uniformly dispersed in the hole transport region 131 (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 less than or equal to −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 the quinone derivative may include TCNQ, F4-TCNQ, etc.
Examples of the cyano group-containing compound may include HAT-CN (or HAT), a compound represented by Formula 221, and the like:
In Formula 221,
In the compound including element EL1 and element EL2, element EL1 may be metal, metalloid, or any combination thereof, and element EL2 may be non-metal, 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 tungsten oxide (for example, WO, W2O3, WO2, WO3, W2O5, etc.), vanadium oxide (for example, VO, V2O3, VO2, V2O5, etc.), molybdenum oxide (MoO, Mo2O3, MoO2, MoO3, Mo2O5, etc.), and rhenium oxide (for example, ReO3, etc.).
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, TaBrs, TaI3, etc.), a chromium halide (for example, CrF3, CrO3, CrBr3, CrI3, etc.), a molybdenum halide (for example, MoF3, MoCl3, MoBr3, MoI3, etc.), a tungsten halide (for example, WF3, WCl3, 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, RuI2, 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, CuI, etc.), a silver halide (for example, AgF, AgCI, 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, etc.), an indium halide (for example, InI3, etc.), and a tin halide (for example, SnI2, etc.).
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.
An example 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 135 in interlayer 130]
When the light-emitting device 10 is a full-color light-emitting device, the emission layer 135 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 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 135 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.
In an embodiment, the emission layer 135 may further include a host, an auxiliary dopant, a sensitizer, delayed fluorescence material, or any combination thereof, in addition to the first emitter and the first host as described in the specification.
An amount of the first emitter in the emission layer 135 may be in a range of about 0.01 parts by weight to about 15 parts by weight, per 100 parts by weight of the emission layer 135. When the amount of the first emitter satisfies these ranges, excellent luminescence efficiency may be achieved without a substantial increase in driving voltage.
A thickness of the emission layer 135 may be in a range of about 100 Å to about 1,000 Å. For example, the thickness of the emission layer 135 may be in a range of about 200 Å to about 600 Å. When the thickness of the emission layer 135 is within these ranges, excellent light-emission characteristics may be obtained without a substantial increase in driving voltage.
The descriptions of the first emitter and the first host are the same as described in the specification.
[Fluorescent Dopant]
The emission layer 135 may further include a fluorescent dopant in addition to the first emitter and the first host as described in the specification.
The fluorescent dopant may include an arylamine compound, a styrylamine compound, a boron-containing compound, or any combination thereof.
For example, 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 each other.
In embodiments, in Formula 501, xd4 may be 2.
In an embodiment, the fluorescent dopant may include: one of Compounds FD1 to FD36; DPVBi; DPAVBi; or any combination thereof:
[Delayed Fluorescence Material]
The emission layer 135 may further include a delayed fluorescence material in addition to the first emitter and the first host.
In the specification, the delayed fluorescence material may be selected from compounds capable of emitting delayed fluorescence based on a delayed fluorescence emission mechanism.
The delayed fluorescence material included in the emission layer 135 may serve as a host or as a dopant, depending on the types of other materials included in the emission layer 135.
In embodiments, a difference between the triplet energy level (eV) of the delayed fluorescence material and the singlet energy level (eV) of the delayed fluorescence material may be in a range of about 0 eV to about 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 materials 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:
[Electron Transport Region in Interlayer 130]
The electron transport region 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-transporting region may include a buffer layer, a hole-blocking layer, an electron control layer, an electron-transporting layer, an electron injection layer, or any combination thereof.
In embodiments, the electron transport region 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 constituting layers of each structure may be stacked from an emission layer in its respective stated order, but the structure of the electron transport region is not limited thereto.
In an embodiment, the electron transport region may include a buffer layer and an electron transport layer, the buffer layer may be disposed between the emission layer 135 and the second electrode 150, and the electron transport layer may be disposed between the buffer layer and the second electrode 150. For example, the light-emitting device may have a structure in which the buffer layer and the electron transport layer are sequentially stacked from the emission layer 135.
In an embodiment, a LUMO energy level of a buffer layer material included in the buffer layer may be in a range of about −2.50 eV to about −2.10 eV. For example, the LUMO energy level of a buffer layer material included in the buffer layer may be in a range of about −2.40 eV to about −2.20 eV.
In an embodiment, an electron mobility of a buffer layer material included in the buffer layer may be in a range of about 4.38×10−5 cm2/Vs to about 7.00×10−3 cm2/Vs. For example, the electron mobility of a buffer layer material included in the buffer layer may be in a range of about 5.00×10−4 cm2/Vs to about 4.58×10−4 cm2/Vs.
In an embodiment, a LUMO energy level of an electron transport layer material included in the electron transport layer may be in a range of about −2.50 eV to about −2.10 eV. For example, the LUMO energy level of an electron transport layer material included in the electron transport layer may be in a range of about −2.40 eV to about −2.20 eV.
In an embodiment, an electron mobility of an electron transport layer material included in the electron transport layer may be in a range of about 6.95×10−5 cm2/Vs to about 1.39×10−3 cm2/Vs. For example, the electron mobility of an electron transport layer material included in the electron transport layer may be in a range of about 9.00×10−4 cm2/Vs to about 1.20×10−3 cm2/Vs.
In an embodiment, an absolute value of a LUMO energy level of a buffer layer material may be greater than an absolute value of a LUMO energy level of the first host.
In an embodiment, an absolute value of the difference between a LUMO energy level of the first host and a LUMO energy level of a buffer layer material may be in a range of about 0 eV to about 0.60 eV. For example, the absolute value of the difference between a LUMO energy level of the first host and a LUMO energy level of a buffer layer material may be in a range of about 0 eV to about 0.54 eV.
In an embodiment, an absolute value of a LUMO energy level of an electron transport layer material may be greater than an absolute value of a LUMO energy level of a buffer layer material.
In an embodiment, an absolute value of a LUMO energy level of an electron transport layer material may be greater than an absolute value of a LUMO energy level of a buffer layer material.
In an embodiment, an absolute value of the difference between a LUMO energy level of a buffer layer material and a LUMO energy level of an electron transport layer material may be in a range of about 0 eV to about 0.30 eV.
In an embodiment, the electron transport region (for example, a buffer layer, a hole-blocking layer, an electron control layer, or an electron transport layer in the electron transport region) 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 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 may be linked to each other via a single bond.
In an embodiment, in Formula 601, Ar601 may be a substituted or unsubstituted anthracene group.
In an embodiment, the electron transport region may include a buffer layer and an electron transport layer, sequentially stacked from the emission layer 135, and each of a buffer layer material and an electron transport layer material may be a compound represented by Formula 601 that satisfies the conditions (for example, LUMO energy level, etc.) as described in the specification from among the compounds represented by Formula 601.
In an embodiment, the electron transport region may include a compound represented by Formula 601-1:
In Formula 601-1,
In an embodiment, in Formulae 601 and 601-1, xe1 and xe611 to xe613 may each independently be 0, 1, or 2.
In an embodiment, the electron transport region may include a buffer layer, and a buffer layer material may be selected from BF01 to BF10:
In an embodiment, the electron transport region may include an electron transport layer, and an electron transport layer material may be selected from ET01 to ET10:
A thickness of the electron transport region may be in a range of about 100 Å to about 5,000 Å. For example, the thickness of the electron transport region may be in a range of about 160 Å to about 4,000 Å. When the electron transport region 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 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 layer are within these ranges, satisfactory electron transporting characteristics may be obtained without a substantial increase in driving voltage.
The electron transport region (for example, an electron transport layer in the electron transport region) 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. The 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 the 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 the metal ion of the alkali metal complex or with the 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 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 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: alkali metal oxides, such as Li2O, Cs2O, or K2O; alkali metal halides, such as LiF, NaF, CsF, KF, LiI, NaI, CsI, KI, or RbI; or any combination thereof. The alkaline earth metal-containing compound may include an alkaline earth metal compound, such as BaO, SrO, CaO, BaxSri-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 are 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 bonded 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 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 on the interlayer 130 having a structure as described above. The second electrode 150 may be a cathode, which is an electron injection electrode. A material for forming the second electrode 150 may be 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 (AI), 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 130, and the second electrode 150 are stacked in this stated order, a structure in which the first electrode 110, the interlayer 130, 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 130, the second electrode 150, and the second capping layer are stacked in this stated order.
Light generated in an emission layer 135 in the interlayer 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 an emission layer 135 in the interlayer 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 is increased, so that the luminescence efficiency of the light-emitting device 10 may be improved.
In an embodiment, at least one of the first capping layer and the second capping layer may each independently include a material having a refractive index greater than or equal to about 1.6 with respect to a wavelength of about 589 nm. For example, at least one of the first capping layer and the second capping layer may each independently include a material having a refractive index greater than or equal to about 1.8 with respect to a wavelength of about 589 nm. For example, at least one of the first capping layer and the second capping layer may each independently include a material having a refractive index greater than or equal to about 2.0 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 carbocyclic compounds, heterocyclic compounds, amine group-containing compounds, porphine derivatives, phthalocyanine derivatives, naphthalocyanine derivatives, alkali metal complexes, alkaline earth metal complexes, or any combination thereof. In an embodiment, 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.
For example, 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 CP8, β-NPB, or any combination thereof:
[Electronic Device]
The light-emitting device may be included in various electronic devices. In an embodiment, the electronic device including the light-emitting device may be a light-emitting device, an authentication device, or the like.
The electronic device (for example, a light-emitting device) 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. For example, the light emitted from the light-emitting device may be blue light, green light, or white light. For details on the light-emitting device, related description provided above may be referred to. In embodiments, the color conversion layer may include a quantum dot.
The electronic device may include a first substrate. The first substrate may include subpixels, the color filter may include multiple color filter areas respectively corresponding to the subpixels, and the color conversion layer may include multiple 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. For example, 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. For details on the quantum dot, related descriptions provided herein may be referred to. The first area, the second area, and/or the third area may each 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 one another. 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 device 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 device 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 at least one layer of an organic layer and/or an inorganic layer. When the sealing portion is a thin film encapsulation layer, the electronic device 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 device. Examples of the functional layers 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 device 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 Apparatus]
The light-emitting device may be included in various electronic apparatuses.
In an embodiment, an electronic apparatus including the light-emitting device may be a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, a light for 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, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a 3D display, a virtual reality display, and 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.
The light-emitting device may have excellent effects in terms of luminescence efficiency long lifespan, and thus the electronic apparatus including the light-emitting device may have characteristics, such as high luminance, high resolution, and low power consumption.
[Description of
The electronic apparatus (e.g., a light-emitting 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 may be 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 is provided on the passivation layer 280. The light-emitting device may include a first electrode 110, an interlayer 130, and a second electrode 150.
The first electrode 110 may be located on the passivation layer 280. The passivation layer 280 may expose a portion of the drain electrode 270, not fully covering the drain electrode 270, and 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 portion of the first electrode 110, and an interlayer 130 may be formed in the exposed portion of the first electrode 110. The pixel defining layer 290 may be a polyimide or polyacrylic organic film. Although not shown in
A second electrode 150 may be located on the interlayer 130, and a second capping layer 170 may be further included on the second electrode 150. The second capping layer 170 may be formed to cover the second electrode 150.
The encapsulation portion 300 may be located on the second 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 film and the organic film.
The electronic apparatus (e.g., a light-emitting apparatus) of
[Description of
For example, the electronic apparatus 1 may be a center information display (CID) on an instrument panel and a center fascia or 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 car or a display placed on the back of the front seat, 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).
The electronic apparatus 1 may include a display area DA and a non-display area NDA outside the display area DA. A display device 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. In an embodiment, in the non-display area NDA, a driver for providing electrical signals or power to display devices arranged on the display area DA may be arranged. In an embodiment, in the non-display area NDA, a pad, which is an area to which an electronic element or a printing circuit board may be electrically connected, may be arranged.
In the electronic apparatus 1, a length in an x-axis direction and a length in a y-axis direction may be different from each other. For example, 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 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 filler 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 filler arranged between the side window glass 1100 and the front window glass 1200.
The side window glass 1100 may be installed on the 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. In other words, 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 the in −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 vehicle body. In one 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 lamp, a seat belt warning lamp, an odometer, a hodometer, an automatic shift selector indicator lamp, a door open warning lamp, an engine oil warning lamp, 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 arranged 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, as the display device 2 according to an embodiment, an organic light-emitting display device display including the light-emitting device will be described as an example, but various types of display devices as described herein may be used as embodiments.
Referring to
Referring to
Referring to
[Manufacturing Method]
Respective layers included in the hole transport region 131, the emission layer 135, and respective layers included in the electron transport region 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, and laser-induced thermal imaging.
When layers constituting the hole transport region 131, an emission layer 135, and layers constituting the electron transport region 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 consisting of carbon atoms as the only ring-forming atoms and having three to sixty carbon atoms, and the term “C1-C60 heterocyclic group” as used herein may be a cyclic group that has one to sixty carbon atoms and further has, in addition to a carbon atom, at least one heteroatom as a ring-forming 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 has 3 to 61 ring-forming atoms.
The “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 that has three to sixty carbon atoms and may not include *—N═*′ as a ring-forming moiety, and the term “π electron-deficient nitrogen-containing C1-C60 cyclic group” as used herein may be a heterocyclic group that has one to sixty carbon atoms and may include *—N═*′ as a ring-forming moiety.
In an embodiment,
The terms “cyclic group”, “C3-C60 carbocyclic group”, “C1-C60 heterocyclic group”, “π electron-rich C3-C60 cyclic group”, or “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, the “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 and 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 and a divalent C1-C60 heterocyclic group may include a C3-C1 cycloalkylene group, a C1-C10 heterocycloalkylene group, a C3-C1 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 substituted or unsubstituted 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 specific 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 and a propynyl group. 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-C1 heterocycloalkylene group” as used herein may be a divalent group having a same structure as the C1-C1 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-C1 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-C1 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-C1 heterocycloalkenylene group” as used herein may be a divalent group having a same structure as the C1-C1 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, and 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, further including, in addition to carbon atoms, at least one heteroatom, as ring-forming atoms. 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, further including, in addition to carbon atoms, at least one heteroatom, as ring-forming atoms. Examples of a C1-C6a 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 no 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.
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 no 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.
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), and the term “C6-C60 arylthio group” as used herein may be a group represented by —S(A103) (wherein A103 may be C6-C60 aryl group).
The term “C7-C60 aryl alkyl group” 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), and the term C2-C60 heteroaryl alkyl group” 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: hydrogen; deuterium; —F; —C1; —Br; —I; a hydroxyl group; a cyano group; a nitro group; or a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C60 carbocyclic group, or a C1-C60 heterocyclic group, each unsubstituted or substituted with deuterium, —F, a cyano group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a phenyl group, a biphenyl group, or any combination thereof.
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 combinations thereof.
The term “third-row transition metal” used herein may be hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), or the like.
The term “Ph” as used herein refers to a phenyl group, the term “Me” as used herein refers to a methyl group, the term “Et” as used herein refers to an ethyl group, the terms “ter-Bu” or “But” as used herein each refer to a tert-butyl group, and the term “OMe” as used herein refers to a methoxy group.
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.
Hereinafter, a light-emitting device according to embodiments will be described in detail with reference to the Examples.
According to the method shown in Table 1, the HOMO energy level, LUMO energy level, hole mobility, electron mobility, and/or triplet (T1) energy of each of the compounds listed in Tables 2 to 8 were evaluated, and results obtained therefrom are shown in Tables 2 to 8.
PMMA and Compound GD01 (4 wt % compared to PMMA) were mixed with each other in CH2Cl2 solution, and the resultant obtained therefrom was coated on a quartz substrate using a spin coater, heat-treated in an oven at 80° C., and cooled to room temperature, thereby obtaining Film GD01 having a thickness of 40 nm. Films GD02 to GD05, R-GD1, GD24, and GD25 were manufactured in the same method as used to manufacture Film GD01, except that Compounds GD02 to GD05, R-GD1, GD24, and GD25 were each used instead of Compound GD01.
For each of Films GD01 to GD05, R-GD1, GD24, and GD25, the luminescence spectrum was measured by a Quantaurus-QY Absolute PL quantum yield spectrometer manufactured by Hamamatsu Company (equipped with a xenon light source, a monochromator, a photonic multichannel analyzer, and an integrating sphere, and using photoluminescence quantum yield (PLQY) measurement software (Hamamatsu Photonics, Ltd., Shizuoka, Japan)). During measurement, the excitation wavelength was scanned from 320 nm to 380 nm at 10 nm intervals, and the spectrum measured at the excitation wavelength of 340 nm was used to obtain the maximum emission wavelength (emission peak wavelength) of the compound included in each film. Results thereof are shown in Table 9.
A glass substrate (product of Corning Inc.) with a 15 Ω/cm2 (1,200 Å) ITO formed thereon as an anode was cut to a size of 50 mm×50 mm×0.7 mm, sonicated using isopropyl alcohol and pure water each for 5 minutes, cleaned by irradiation of ultraviolet rays and exposure of ozone thereto for 30 minutes, and mounted on a vacuum deposition apparatus.
A third material (HT01) was vacuum-deposited on the anode to form a third layer having a thickness of 1,300 Å, and a second material (G′01) was vacuum-deposited on the third layer to form a second layer having a thickness of 250 Å, and a first material (GI01) was vacuum-deposited on the second layer to form a first layer having a thickness of 50 Å.
On the first layer, a first host (Host1) and a first emitter (GD01) were vacuum-deposited at a weight ratio of 93:7 to form an emission layer having a thickness of 400 Å.
A buffer layer material (BF03) was vacuum-deposited on the emission layer to form a buffer layer having a thickness of 50 Å, and an electron transport layer material (ET02) was vacuum-deposited on the buffer layer to form an electron transport layer having a thickness of 310 Å. Yb was vacuum-deposited on the electron transport layer to form an electron injection layer having a thickness of 15 Å, Ag and Mg were vacuum-deposited to form a cathode having a thickness of 800 Å, and Compound CP7 was vacuum-deposited on the cathode to form a capping layer having a thickness of 600 Å.
Organic light-emitting devices were manufactured in the same manner as in Example 1, except that the compounds listed in Table 10 were used as a third material, a second material, a first material, a first host, a first emitter, a buffer layer material, and an electron transport layer material.
An organic light-emitting device was manufactured in the same method as in Comparative Example 2, except that a mixture of the compounds listed in Table 10 (weight ratio of 1:1) was used as the first host when forming the emission layer.
An organic light-emitting device was manufactured in the same method as in Comparative Example 4, except that a mixture of the compounds listed in Table 10 (weight ratio of 1:1) was used as the first host when forming the emission layer.
An organic light-emitting device was manufactured in the same manner as in Example 1, except that as the third layer, a 650 Å-thick 2-TNATA layer and a 650 Å-thick NPB layer were sequentially formed using a vacuum deposition method, and the second material, the first material, the first host, the first emitter, the buffer layer material, and the electron transport layer material listed in Table 10 were used.
The driving voltage, maximum power efficiency, and maximum emission wavelength of the electroluminescent (EL) spectrum of each of the organic light-emitting devices manufactured according to Examples 1 to 10 and Comparative Example 1 to 6 were measured using Keithley MU 236 and a luminance meter (Minolta Cs-1000A). Results thereof are summarized in Table 11, respectively. On the other hand, the numbers in parentheses in Table 10 represent the HOMO energy level (eV) values of corresponding compounds. [Table 10]
From Table 11, it can be confirmed that the driving voltage and maximum power efficiency of Examples 1 to 10 are improved compared to the driving voltage and maximum power efficiency of Comparative Examples 1 to 6.
The light-emitting devices may have a low driving voltage and high power efficiency. Accordingly, the light-emitting devices may enable the manufacture of a high-quality electronic device and a high-quality electronic apparatus.
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 purpose 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 |
|---|---|---|---|
| 10-2022-0063069 | May 2022 | KR | national |
| 10-2022-0191039 | Dec 2022 | KR | national |
