Patent Application
20240018175
This application claims priority to and benefits of Korean Patent Application No. 10-2022-0081496 under 35 U.S.C. § 119, filed on Jul. 1, 2022, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.
Embodiments relate to an organometallic compound, a light-emitting device including the same, and an electronic apparatus and electronic equipment that include the light-emitting device.
Organic light-emitting devices are self-emissive devices that, as compared with devices of the related art, have wide viewing angles, high contrast ratios, short response times, and excellent characteristics in terms of luminance, driving voltage, and response speed, and produce full-color images.
In an example, an organic light-emitting device may have a structure in which a first electrode is arranged on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode are sequentially formed 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 transit from an excited state to a ground state, thereby generating light.
It is to be understood that this background of the technology section is, in part, intended to provide useful background for understanding the technology. However, this background of the technology section may also include ideas, concepts, or recognitions that were not part of what was known or appreciated by those skilled in the pertinent art prior to a corresponding effective filing date of the subject matter disclosed herein.
Embodiments may include an organometallic compound and a light-emitting device having a low driving voltage, a high luminance, high efficiency, and long lifespan characteristics by including the organometallic compound, and an electronic apparatus and electronic equipment that include the light-emitting device.
Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the embodiments of the disclosure.
According to embodiments, provided is an organometallic compound which may be represented by Formula 1:
In Formula 1,
According to an embodiment, ring A1 may be a 5-membered heterocyclic group, a 6-membered heterocyclic group, a bicyclic or higher C5-C30 heterocyclic group including a 5-membered cyclic group, a bicyclic or higher C6-C30 heterocyclic group including a 6-membered cyclic group, a bicyclic or higher C1-C30 heterocyclic group including a 5-membered heterocyclic group, or a bicyclic or higher C1-C30 heterocyclic group including a 6-membered heterocyclic group.
According to an embodiment, in Formula 1, a moiety represented by
may be a moiety represented by one of Formulae 1-2-1 to 1-2-3, which are explained below.
According to an embodiment, ring A2 to ring A4 may each independently be:
According to an embodiment, the organometallic compound may satisfy at least one of Conditions i to iii, which are explained below.
According to an embodiment, in Formula 1, a moiety represented by
may be a moiety represented by one of Formulae 1-3-1 to 1-3-3, which are described below.
According to an embodiment, Ar1 and Ar2 may each independently include a group represented by one of Formulae 1-4-1 to 1-4-15, which are explained below.
According to an embodiment, Ar2 is a group that may include deuterium, and Ar2 may have an equivalent weight in a range of about 3 to about 13.
According to an embodiment, at least one of a bond between M1 and X1, a bond between M1 and X2, a bond between M1 and X3, and a bond between M1 and X4 may be a coordinate bond.
According to an embodiment, R1 to R4 may each independently be:
According to an embodiment, the organometallic compound may be electrically neutral.
According to an embodiment, the organometallic compound represented by Formula 1 may be one of Compounds 1 to 168, which are explained below.
According to embodiments, a light-emitting device may include a first electrode,
According to an embodiment,
According to an embodiment, the emission layer may include the organometallic compound.
According to an embodiment, the emission layer may include a host and a dopant, and the dopant may include the organometallic compound.
According to an embodiment, the light-emitting device may have a triplet metal-to-ligand charge transfer (3MLCT) value of greater than or equal to about 11%.
According to embodiments, an electronic apparatus may include the light-emitting device.
According to an embodiment, the electronic apparatus may include a thin-film transistor, and
According to embodiments, an electronic equipment may include the light-emitting device.
According to an embodiment, the electronic equipment may be a flat panel display, a curved display, a computer monitor, a medical monitor, a television, an advertisement board, an indoor light, an outdoor light, a signaling 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 microdisplay, a 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 sign.
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 of” for the purpose of its meaning and interpretation. For example, “at least one of A and B” may be understood to mean “A, B, or A and B.” 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.
An aspect of the disclosure provides an organometallic compound represented by Formula 1:
In Formula 1,
In the organometallic compound according to an embodiment, M1 may be Pt, Pd, or Ir.
In the organometallic compound according to an embodiment, ring A1 may be a 5-membered heterocyclic group, a 6-membered heterocyclic group, a bicyclic or higher C5-C30 heterocyclic group including a 5-membered cyclic group, a bicyclic or higher C6-C30 heterocyclic group including a 6-membered cyclic group, a bicyclic or higher C1-C30 heterocyclic group including a 5-membered heterocyclic group, or a bicyclic or higher C1-C30 heterocyclic group including a 6-membered heterocyclic group.
In the organometallic compound according to an embodiment, in Formula 1, a moiety represented by
may be a moiety represented by one of Formulae 1-2-1 to 1-2-3:
In Formulae 1-2-1 to 1-2-3,
In the organometallic compound according to an embodiment, ring A2 to ring A4 may each independently be:
The organometallic compound according to an embodiment may satisfy at least one of Conditions i to iii:
In the organometallic compound according to an embodiment, in Formula 1, a moiety represented by
may be a moiety represented by one of Formulae 1-3-1 to 1-3-3:
In Formulae 1-3-1 to 1-3-3,
In the organometallic compound according to an embodiment, ring A2 may be a group represented by Formula 1-3-2.
In the organometallic compound according to an embodiment, at least one of ring A1 to ring A4 may include a carbene moiety.
In the organometallic compound according to an embodiment, ring A2 may include a carbene moiety.
In the organometallic compound according to an embodiment, ring A3 and A4 may each independently be represented by one of Formulae 2-1 to 2-7:
In Formulae 2-1 to 2-7,
In the organometallic compound according to an embodiment, at least one of ring A4 and ring A3 may be represented by one of Formulae 2-5 to 2-7.
In the organometallic compound according to an embodiment, Ar1 and Ar2 may each independently include a group represented by one of Formulae 1-4-1 to 1-4-15:
In Formulae 1-4-1 to 1-4-15,
In an embodiment, one or more hydrogen atoms included in the group represented by one of Formulae 1-4-1 to 1-4-15 may be substituted with deuterium, or all hydrogen atoms may be substituted with deuterium.
In the organometallic compound according to an embodiment, Ar1 may be a group that includes deuterium, and Ar1 may have an equivalent weight in a range of about 3 to about 13.
In the organometallic compound according to an embodiment, Ar1 may include at least one selected from a phenyl-D3 group, a phenyl-D4 group, and a phenyl-D5 group.
In the organometallic compound according to an embodiment, Ar2 may be a group that includes deuterium, and Ar2 may have an equivalent weight in a range of about 3 to about 13.
In the organometallic compound according to an embodiment, Ar2 may include at least one selected from a phenyl-D3 group, a phenyl-D4 group, and a phenyl-D5 group.
In the organometallic compound according to an embodiment, at least one of a bond between M1 and X1, a bond between M1 and X2, a bond between M1 and X3, a bond between M1 and X4 may be a coordinate bond.
In the organometallic compound according to an embodiment, a bond between M1 and X1, a bond between M1 and X2, and a bond between M1 and X3 may each be a covalent bond, and
a bond between M1 and X4 may be a coordinate bond.
In the organometallic compound according to an embodiment, L1 may be O or S, a1 may be 1, and a2 and a3 may each independently be 0.
In the organometallic compound according to an embodiment, R1 to R4 may each independently be:
In Formulae 5-1 to 5-26 and 6-1 to 6-55,
In an embodiment, the organometallic compound may be electrically neutral.
In an embodiment, the organometallic compound may be represented by Formula 1-1:
In Formula 1-1,
In an embodiment, the organometallic compound represented by Formula 1 may be one of Compounds 1 to 168:
Another aspect of the disclosure provides a light-emitting device which may include:
In the light-emitting device according to an embodiment, the interlayer may include the organometallic compound.
In the light-emitting device according to an embodiment, the emission layer may include the organometallic compound.
In the light-emitting device according to an embodiment, the emission layer may include a host and a dopant, and the dopant may include the organometallic compound.
In an embodiment, the light-emitting device may further include:
In the light-emitting device according to an embodiment, the organometallic compound may have a lowest unoccupied molecular orbital (LUMO) energy level greater than or equal to about −1.4 eV.
In the light-emitting device according to an embodiment, the organometallic compound may have a triplet metal-to-ligand charge transfer (3MLCT) value of greater than or equal to about 11%.
In the light-emitting device according to an embodiment, the emission layer may emit blue light.
In the light-emitting device according to an embodiment, the electron transport region may include an electron transport layer and an electron injection layer, wherein
Another aspect of the disclosure provides an electronic apparatus which may include the light-emitting device.
In an embodiment, the electronic apparatus may further include:
Another aspect of the disclosure provides an electronic equipment which may include the light-emitting device.
The electronic equipment may be a flat panel display, a curved display, a computer monitor, a medical monitor, a television, an advertisement board, an indoor light, an outdoor light, a signaling 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 microdisplay, a 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 sign.
The organometallic compound represented by Formula 1 may include a ring A1 moiety, and the ring A1 moiety may include one or more ether groups. By including one or more ether groups in the ring A1 moiety, the LUMO energy level of the organometallic compound may be stabilized, and accordingly the 3MLCT of the organometallic compound may be also improved. For example, the organometallic compound represented by Formula 1 may have a LUMO energy level of greater than or equal to about −1.4 eV, a T1 energy level of greater than or equal to about 2.7 eV, and a 3MLCT value of greater than or equal to about 11%:
Based on the improvement on the LUMO energy level, T1 level, and 3MLCT, the color purity and/or luminance of light emitted from the organometallic compound may be improved. For example, the organometallic compound represented by Formula 1 may stably generate blue light.
The organometallic compound represented by Formula 1 may include Ar1 and Ar2, and Ar1 and Ar2 may each independently include a substituent represented by one of Formulae 1-4-1 to 1-4-15. Due to the introduction of a substituent having large steric hindrance, interaction with an adjacent material may be restricted, and thus decomposition of the organometallic compound according to the movement of electrons or holes may be delayed. As a result, the lifespan of the organometallic compound may be increased. Furthermore, the organometallic compound represented by Formula 1 may maintain an optimal intermolecular density.
By changing substituents bonded to Formula 1, a highest occupied molecular orbital (HOMO) energy level, a LUMO energy level, an energy gap between the HOMO and LUMO energy levels, a T1 energy level, and the like of the organometallic compound represented by Formula 1 may be finely adjusted.
As a result, the hole mobility and electron mobility of the organometallic compound may be evenly improved, and accordingly, the quantum efficiency of the organometallic compound may be also improved. Accordingly, an electronic device, for example, an organic light-emitting device, including the organometallic compound may emit blue light and have high efficiency and a long lifespan.
Synthesis methods of the organometallic compound represented by Formula 1 may be recognized by one of ordinary skill in the art by referring to Synthesis Examples and/or Examples below.
At least one organometallic compound represented by Formula 1 may be used in a light-emitting device (for example, an organic light-emitting device). Another aspect of the disclosure provides a light-emitting device which may include: a first electrode; a second electrode facing the first electrode; an interlayer arranged the first electrode and the second electrode and including an emission layer; and the organometallic compound represented by Formula 1.
The wording “(interlayer and/or capping layer) includes an organometallic compound” as used herein may be understood as “(interlayer and/or capping layer) may include one kind of organometallic compound represented by Formula 1 or two different kinds of organometallic compounds, each represented by Formula 1.”
In an embodiment, the interlayer and/or the capping layer may include Compound 1 only as the organometallic compound. In this regard, Compound 1 may be present in the emission layer of the light-emitting device. In embodiments, the interlayer may include, as the organometallic compound, Compound 1 and Compound 2. In this regard, Compound 1 and Compound 2 may be present in the same layer (for example, both Compound 1 and Compound 2 may be present in the emission layer), or may be present in different layers (for example, Compound 1 may be present in the emission layer, and Compound 2 may be present in the electron transport region).
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 aspect of the disclosure provides an electronic apparatus which may include the light-emitting device. The electronic apparatus may further include a thin-film transistor. For example, the electronic apparatus may further include a thin-film transistor including a source electrode and a drain electrode, wherein the first electrode of the light-emitting device may be electrically connected to the source electrode or the drain electrode. In an embodiment, the electronic apparatus may further include a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof. More details of the electronic apparatus may be found in the descriptions provided herein.
[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. In an embodiment, 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 (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), magnesium-silver (Mg—Ag), or any combination thereof.
The first electrode 110 may have a single-layer structure consisting of a single layer or a multi-layer structure. For example, the first electrode 110 may have a three-layer structure of ITO/Ag/ITO.
[Interlayer 130]
The interlayer 130 may be located on the first electrode 110. The interlayer 130 may include the emission layer.
The interlayer 130 may further include a hole transport region between the first electrode 110 and the emission layer, and an electron transport region between the emission layer and the second electrode 150.
The interlayer 130 may further include, in addition to various organic materials, a metal-containing compound, such as the organometallic compound represented by Formula 1, and an inorganic material, such as a quantum dot.
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 a charge generation layer between the two or more emitting units. When the interlayer 130 includes the two or more emitting units and the charge generation layer, the light-emitting device 10 may be a tandem light-emitting device.
[Hole Transport Region in Interlayer 130]
The hole 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 hole transport region may include a hole injection layer, a hole transport layer, an emission auxiliary layer, an electron blocking layer, or any combination thereof.
For example, the hole transport region may have a multi-layer structure including a hole injection layer/hole transport layer structure, a hole injection layer/hole transport layer/emission auxiliary layer structure, a hole injection layer/emission auxiliary layer structure, a hole transport layer/emission auxiliary layer structure, or a hole injection layer/hole transport layer/electron blocking layer structure, wherein constituent layers of each structure may be stacked in this stated order from the first electrode 110.
The hole transport region may include a compound represented by Formula 201, a compound represented by Formula 202, or any combination thereof:
In Formulae 201 and 202,
In an embodiment, each of Formulae 201 and 202 may include at least one of groups represented by Formulae CY201 to CY217:
In Formulae CY201 to CY217, R10b and R10c 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 an embodiment, in Formulae CY201 to CY217, ring CY201 to ring CY204 may each independently be a benzene group, a naphthalene group, a phenanthrene group, or an anthracene group.
In embodiments, each of Formulae 201 and 202 may include at least one of the groups represented by Formulae CY201 to CY203.
In embodiments, Formula 201 may include at least one of the 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 one of the groups represented by Formulae CY201 to CY203, xa2 may be 0, and R202 may be one of the groups represented by Formulae CY204 to CY207.
In embodiments, each of Formulae 201 and 202 may not include the groups represented by Formulae CY201 to CY203.
In embodiments, each of Formulae 201 and 202 may not include the groups represented by Formulae CY201 to CY203, and may include at least one of the groups represented by Formulae CY204 to CY217.
In embodiments, each of Formulae 201 and 202 may not include the groups represented by Formulae CY201 to CY217.
For example, the hole transport region may include one of Compounds HT1 to HT46, m-MTDATA, TDATA, 2-TNATA, NPB(NPD), β-NPB, TPD, Spiro-TPD, Spiro-NPB, methylated NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA), polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (PANI/CSA), polyaniline/poly(4-styrenesulfonate) (PANT/PSS), or any combination thereof:
A thickness of the hole transport region may be in a range of about 50 Å to about 10,000 Å. For example, the thickness of the hole transport region may be in a range of about 100 Å to about 4,000 Å. When the hole transport region includes a hole injection layer, a hole transport layer, or any combination thereof, a thickness of the hole injection layer may be in a range of about 100 Å to about 9,000 Å, and a thickness of the hole transport layer may be in a range of about 50 Å to about 2,000 Å. For example, the thickness of the hole injection layer may be in a range of 100 Å to about 1,000 Å and a thickness of the hole transport layer may be in a range of about 100 Å to about 1,500 Å. When the thicknesses of the hole transport region, the hole injection layer, and the hole transport layer are within these ranges, satisfactory hole transporting characteristics may be obtained without a substantial increase in driving voltage.
The emission auxiliary layer may increase light-emission efficiency by compensating for an optical resonance distance according to the wavelength of light emitted by the emission layer, and the electron blocking layer may block the leakage of electrons from the emission layer to the hole transport region. Materials that may be included in the hole transport region may be included in the emission auxiliary layer and the electron blocking layer.
[p-Dopant]
The hole transport region 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 (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.
For example, the p-dopant may have a LUMO energy level of less than or equal to about −3.5 eV.
In an embodiment, 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 be TCNQ, F4-TCNQ, and the like.
Examples of the cyano group-containing compound may be HAT-CN, 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 a metal, a metalloid, or any combination thereof, and element EL2 may be a non-metal, a metalloid, or any combination thereof.
Examples of the 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.); 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.); and the like.
Examples of the metalloid may include silicon (Si), antimony (Sb), tellurium (Te), and the like.
Examples of the non-metal may include oxygen (O), halogen (for example, F, Cl, Br, I, etc.), and the like.
Examples of the 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, a metal iodide, etc.), a metalloid halide (for example, a metalloid fluoride, a metalloid chloride, a metalloid bromide, a metalloid iodide, etc.), a metal telluride, or any combination thereof.
Examples of the metal oxide may include a tungsten oxide (for example, WO, W2O3, WO2, WO3, W2O5, etc.), a vanadium oxide (for example, VO, V2O3, VO2, V2O5, etc.), a molybdenum oxide (MoO, Mo2O3, MoO2, MoO3, Mo2O5, etc.), a rhenium oxide (for example, ReO3, etc.), and the like.
Examples of the metal halide may include an alkali metal halide, an alkaline earth metal halide, a transition metal halide, a post-transition metal halide, a lanthanide metal halide, and the like.
Examples of the alkali metal halide may include LiF, NaF, KF, RbF, CsF, LiCl, NaCl, KCl, RbCl, CsCl, LiBr, NaBr, KBr, RbBr, CsBr, LiI, NaI, KI, RbI, CsI, and the like.
Examples of the 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, BaI2, and the like.
Examples of the transition metal halide may include a titanium halide (for example, TiF4, TiCl4, TiBr4, TiI4, etc.), a zirconium halide (for example, ZrF4, ZrCl4, ZrBr4, ZrI4, etc.), a hafnium halide (for example, HfF4, HfCl4, HfBr4, HfI4, etc.), a vanadium halide (for example, VF3, VCl3, VBr3, VI3, etc.), a niobium halide (for example, NbF3, NbCl3, NbBr3, NbI3, etc.), a tantalum halide (for example, TaF3, TaCl3, TaBr3, TaI3, etc.), a chromium halide (for example, CrF3, CrCl3, CrBr3, CrI3, etc.), a molybdenum halide (for example, MoF3, MoCl3, MoBr3, MoI3, etc.), a tungsten halide (for example, WF3, 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, Felt, 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, AgCl, AgBr, AgI, etc.), a gold halide (for example, AuF, AuCl, AuBr, AuI, etc.), and the like.
Examples of the post-transition metal halide may include a zinc halide (for example, ZnF2, ZnCl2, ZnBr2, ZnI2, etc.), an indium halide (for example, InI3, etc.), a tin halide (for example, SnI2, etc.), and the like.
Examples of the lanthanide metal halide may include YbF, YbF2, YbF3, SmF3, YbCl, YbCl2, YbCl3 SmCl3, YbBr, YbBr2, YbBr3 SmBr3, YbI, YbI2, YbI3, SmI3, and the like.
Examples of the metalloid halide may include an antimony halide (for example, SbCl5, etc.) and the like.
Examples of the metal telluride may include an alkali metal telluride (for example, Li2Te, a 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.), a lanthanide metal telluride (for example, LaTe, CeTe, PrTe, NdTe, PmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, etc.), and the like.
[Emission Layer in Interlayer 130]
When the light-emitting device 10 is a full-color light-emitting device, the emission layer may be patterned into a red emission layer, a green emission layer, and/or a blue emission layer, according to a sub-pixel. In an embodiment, 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 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 may be mixed with each other in a single layer to emit white light.
In an embodiment, the emission layer may include a host and a dopant. The dopant may include a phosphorescent dopant, a fluorescent dopant, or any combination thereof.
The dopant included in the emission layer may be the organometallic compound represented by Formula 1.
The amount of the dopant in the emission layer may be in a range of about 0.01 parts by weight to about 15 parts by weight based on 100 parts by weight of the host.
In embodiments, the emission layer may further include a quantum dot.
In embodiments, the emission layer 120 may further include a delayed fluorescence material. The delayed fluorescence material may serve as a host or as a dopant in the emission layer 120.
A thickness of the emission layer may be in a range of about 100 Å to about 1,000 Å. For example, the thickness of the emission layer may be in a range of about 200 Å to about 600 Å. When the thickness of the emission layer 120 is within these ranges, excellent luminescence characteristics may be obtained without a substantial increase in driving voltage.
[Host]
In an embodiment, the host may include a compound represented by Formula 301:
[Ar301]xb11-[(L301)xb1-R301]xb21 [Formula 301]
In Formula 301,
For example, when xb11 in Formula 301 is 2 or more, two or more of Ar301 may be linked to each other via a single bond.
In embodiments, the host may include a compound represented by Formula 301-1, a compound represented by Formula 301-2, or any combination thereof:
In Formulae 301-1 and 301-2,
In embodiments, the host may include an alkali earth metal complex, a post-transition metal complex, or any combination thereof. In embodiments, the host may include a Be complex (for example, Compound H55), an Mg complex, a Zn complex, or any combination thereof.
In embodiments, the host may include: one of Compounds H1 to H128; 9,10-di(2-naphthyl)anthracene (ADN); 2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN); 9,10-di-(2-naphthyl)-2-t-butyl-anthracene (TBADN); 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP); 1,3-di-9-carbazolylbenzene (mCP); 1,3,5-tri(carbazol-9-yl)benzene (TCP); or any combination thereof:
[Phosphorescent Dopant]
In an embodiment, the emission layer of the light-emitting device may further include, in addition to the organometallic compound represented by Formula 1, a phosphorescent dopant.
The phosphorescent dopant may include at least one transition metal as a central metal.
The phosphorescent dopant may include a monodentate ligand, a bidentate ligand, a tridentate ligand, a tetradentate ligand, a pentadentate ligand, a hexadentate ligand, or any combination thereof.
The phosphorescent dopant may be electrically neutral.
For example, the phosphorescent dopant may include an organometallic compound represented by Formula 401:
In Formulae 401 and 402,
For example, in Formula 402, X401 may be nitrogen and X402 may be carbon, or each of X401 and X402 may be nitrogen.
When xc1 in Formula 401 is 2 or more, in two or more of L401, two ring A401(s) may optionally be linked to each other via T402, which may be a linking group, and two ring A402(s) may optionally be linked to each other via T403, which may be a linking group. T402 and T403 may each independently be the same as described in connection with T401.
In Formula 401, L402 may be an organic ligand. For example, L402 may include a halogen group, a diketone group (for example, an acetylacetonate group), a carboxylic acid group (for example, a picolinate group), —C(═O), an isonitrile group, a —CN group, a phosphorus group (for example, a phosphine group, a phosphite group, etc.), or any combination thereof.
The phosphorescent dopant may include, for example, one of Compounds PD1 to PD39, or any combination thereof:
[Fluorescent Dopant]
In an embodiment, the emission layer of the light-emitting device may further include, in addition to the organometallic compound represented by Formula 1, a fluorescent dopant.
The fluorescent dopant may include an amine group-containing compound, a styryl group-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, Ar601 in Formula 501 may be a condensed cyclic group (for example, an anthracene group, a chrysene group, a pyrene group, etc.) in which three or more monocyclic groups are condensed together.
In an embodiment, xd4 in Formula 501 may be 2.
In an embodiment, the fluorescent dopant may include: one of Compounds FD1 to FD37; DPVBi; DPAVBi; or any combination thereof:
[Delayed Fluorescence Material]
In an embodiment, the emission layer of the light-emitting device may further include, in addition to the organometallic compound represented by Formula 1, a delayed fluorescence material.
The emission layer may include a delayed fluorescence material.
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 may serve as a host or as a dopant, depending on the type of other materials included in the emission layer.
In an embodiment, a difference between a 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 the triplet energy level (eV) of the delayed fluorescence material and the singlet energy level (eV) of the delayed fluorescence material is satisfied within the range above, up-conversion from the triplet state to the singlet state of the delayed fluorescence materials may effectively occur, and thus, the light-emitting device 10 may have improved luminescence efficiency.
For example, the delayed fluorescence material may include: a material including at least one electron donor (for example, a π electron-rich C3-C60 cyclic group and the like, such as a carbazole group) and at least one electron acceptor (for example, a sulfoxide group, a cyano group, a π electron-deficient nitrogen-containing C1-C60 cyclic group, and the like), a material including a C8-C60 polycyclic group including at least two cyclic groups condensed to each other while sharing boron (B), and the like.
Examples of the delayed fluorescence material may include at least one of Compounds DF1 to DF14:
[Quantum Dot]
The emission layer may further include a quantum dot.
The term “quantum dot” as used herein may be a crystal of a semiconductor compound, and may include any material capable of emitting light of various emission wavelengths according to the size of the crystal.
A diameter of the quantum dot may be, for example, in a range of about 1 nm to about 10 nm.
The quantum dot may be synthesized by a wet chemical process, a metal organic chemical vapor deposition process, a molecular beam epitaxy process, or any process similar thereto.
The wet chemical process is a method including mixing a precursor material with an organic solvent and growing quantum dot particle crystals. When the crystal grows, the organic solvent naturally acts as a dispersant coordinated on the surface of the quantum dot crystal and controls the growth of the crystal so that the growth of quantum dot particles may be controlled through a process which costs less, and may be more readily performed than vapor deposition methods, such as metal organic chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE).
The quantum dot may include: a Group II-VI semiconductor compound; a Group III-V semiconductor compound; a Group III-VI semiconductor compound; a Group I-III-VI semiconductor compound; a Group IV-VI semiconductor compound; a Group IV element or compound; or any combination thereof.
Examples of the Group II-VI semiconductor compound may include: a binary compound, such as CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and the like; a ternary compound, such as CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and the like; a quaternary compound, such as CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and the like; or any combination thereof.
Examples of the Group III-V semiconductor compound may include: a binary compound, such as GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and the like; a ternary compound, such as GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InAlP, InNAs, InNSb, InPAs, InPSb, and the like; a quaternary compound, such as GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and the like; or any combination thereof. In an embodiment, the Group III-V semiconductor compound may further include a Group II element. Examples of the Group III-V semiconductor compound further including the Group II element may be InZnP, InGaZnP, InAlZnP, and the like.
Examples of the Group III-VI semiconductor compound may include: a binary compound, such as GaS, GaSe, Ga2Se3, GaTe, InS, InSe, In2S3, In2Se3, InTe, and the like; a ternary compound, such as InGaS3, InGaSe3, and the like; or any combination thereof.
Examples of the Group I-III-VI semiconductor compound may include: a ternary compound, such as AgInS, AgInS2, CuInS, CuInS2, CuGaO2, AgGaO2, AgAlO2, and the like; or any combination thereof.
Examples of the Group IV-VI semiconductor compound may include: a binary compound, such as SnS, SnSe, SnTe, PbS, PbSe, PbTe, and the like; a ternary compound, such as SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and the like; a quaternary compound, such as SnPbSSe, SnPbSeTe, SnPbSTe, and the like; or any combination thereof.
Examples of the Group IV element or compound may include: a single element material, such as Si, Ge, and the like; a binary compound, such as SiC, SiGe, and the like; or any combination thereof.
Each element included in a multi-element compound, such as a binary compound, a ternary compound, and a quaternary compound, may be present at a uniform concentration or at a non-uniform concentration in a particle.
In an embodiment, the quantum dot may have a single structure in which the concentration of each element in the quantum dot is uniform, or may have a core-shell structure. For example, in case that the quantum dot has a core-shell structure a material included in the core and a material included in the shell may be different from each other.
The shell of the quantum dot may serve as a protective layer which prevents chemical denaturation of the core to maintain semiconductor characteristics, and/or may serve as a charging layer which impart electrophoretic characteristics to the quantum dot. The shell 20 may be single-layered or multi-layered. The interface between the core 10 and the shell 20 may have a concentration gradient in which the concentration of an element existing in the shell decreases toward the core 10.
Examples of the shell of the quantum dot may include a metal oxide, a metalloid oxide, a non-metal oxide, a semiconductor compound, or any combination thereof. Examples of the metal oxide, the metalloid oxide, or the non-metal oxide may include: a binary compound, such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, NiO, and the like; a ternary compound, such as MgAl2O4, CoFe2O4, NiFe2O4, CoMn2O4, and the like; or any combination thereof. Examples of the semiconductor compound may include as described herein, a Group II-VI semiconductor compound; a Group III-V semiconductor compound; a Group III-VI semiconductor compound; a Group I-III-VI semiconductor compound; a Group IV-VI semiconductor compound; or any combination thereof. Examples of the semiconductor compound may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, or any combination thereof.
The quantum dot may have an FWHM of the emission wavelength spectrum of less than or equal to about 45 nm. For example, the quantum dot may have an FWHM of the emission wavelength spectrum of less than or equal to about 40 nm. For another example, the quantum dot may have an FWHM of the emission wavelength spectrum of less than or equal to about 30 nm. When the FWHM of the quantum dot is within these ranges, the quantum dot may have improved color purity or improved color reproducibility. Light emitted through the quantum dot may be emitted in all directions, so that a wide viewing angle may be improved.
The quantum dot may be in the form of spherical, pyramidal, multi-arm, or cubic nanoparticles, nanotubes, nanowires, nanofibers, or nanoplate particles.
Since the energy band gap may be adjusted by controlling the size of the quantum dot, light having various wavelength bands may be obtained from the quantum dot emission layer. Accordingly, by using quantum dots 100 of different sizes, a light-emitting device that emits light of various wavelengths may be implemented. In an embodiment, the size of the quantum dots 100 may be selected to emit red light, green light, and/or blue light. The size of the quantum dots 100 may be configured to emit white light by combination of light of various colors.
[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 transport region may include a buffer layer, a hole blocking layer, an electron control layer, an electron transport layer, an electron injection layer, or any combination thereof.
For example, 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 layers of each structure may be stacked from the 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 (for example, the buffer layer, the hole blocking layer, the electron control layer, or the 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.
For example, 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 embodiments, the electron transport region may include a compound represented by Formula 601-1:
For example, in Formulae 601 and 601-1, xe1 and xe611 to xe613 may each independently be 0, 1, or 2.
The electron transport region may include one of Compounds ET1 to ET45, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq3, BAlq, TAZ, NTAZ, or any combination thereof:
A thickness of the electron transport region 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 each independently be in a range of about 20 Å to about 1,000 Å, for example, and the 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, and the thickness of the electron transport layer may be in a range of about 150 Å to about 500 Å. When the thicknesses of the buffer layer, the hole blocking layer, the electron control layer, the electron transport layer, and/or the electron transport region 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 the alkaline earth-metal complex may 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 structure including multiple layers including different materials.
The electron injection layer may include an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal-containing compound, an alkaline earth metal-containing compound, a rare earth metal-containing compound, an alkali metal complex, an alkaline earth metal complex, a rare earth metal complex, or any combination thereof.
The alkali metal may include Li, Na, K, Rb, Cs, or any combination thereof. The alkaline earth metal may include Mg, Ca, Sr, Ba, or any combination thereof. The rare earth metal may include Sc, Y, Ce, Tb, Yb, Gd, or any combination thereof.
The alkali metal-containing compound, the alkaline earth metal-containing compound, and the rare earth metal-containing compound may be oxides, halides (for example, fluorides, chlorides, bromides, iodides, etc.), or tellurides of the alkali metal, the alkaline earth metal, and the rare earth metal, or any combination thereof.
The alkali metal-containing compound may include: an alkali metal oxide, such as Li2O, Cs2O, K2O, and the like; alkali metal halides, such as LiF, NaF, CsF, KF, LiI, NaI, CsI, KI, and the like; or any combination thereof. The alkaline earth metal-containing compound may include an alkaline earth metal compound, such as BaO, SrO, CaO, BaxSr1-xO (wherein x is a real number satisfying 0<x<1), BaxCa1-xO (wherein x is a real number satisfying 0<x<1), and 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 an embodiment, the rare earth metal-containing compound may include a lanthanide metal telluride. Examples of the lanthanide metal telluride may include LaTe, CeTe, PrTe, NdTe, PmTe, SmTe, EuTe, GdTe, TbTe, DyTe, HoTe, ErTe, TmTe, YbTe, LuTe, La2Te3, Ce2Te3, Pr2Te3, Nd2Te3, Pm2Te3, Sm2Te3, Eu2Te3, Gd2Te3, Tb2Te3, Dy2Te3, Ho2Te3, Er2Te3, Tm2Te3, Yb2Te3, Lu2Te3, and the like.
The alkali metal complex, the alkaline earth-metal complex, and the rare earth metal complex may include one of alkali metal ions, alkaline earth metal ions, and rare earth metal ions and, a ligand bonded to the metal ion (for example, hydroxyquinoline, hydroxyisoquinoline, hydroxybenzoquinoline, hydroxyacridine, hydroxyphenanthridine, hydroxyphenyloxazole, hydroxyphenylthiazole, hydroxyphenyloxadiazole, hydroxyphenylthiadiazole, hydroxyphenylpyridine, hydroxyphenyl benzimidazole, hydroxyphenylbenzothiazole, bipyridine, phenanthroline, cyclopentadiene, or any combination thereof).
In an embodiment, 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 an embodiment, the electron injection layer may consist of an alkali metal-containing compound (for example, an alkali metal halide), an alkali metal-containing compound (for example, 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, and 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 above, satisfactory electron injection characteristics may be obtained without a substantial increase in driving voltage.
[Second Electrode 150]
The second electrode 150 may be arranged on the 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, for example a metal, an alloy, an electrically conductive compound, or any combination thereof.
The second electrode 150 may include lithium (L1), silver (Ag), magnesium (Mg), aluminum (A1), aluminum-lithium (A1-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-layer structure or a multi-layer structure.
[Capping Layer]
The light-emitting device 10 may include a first capping layer outside the first electrode 110, and/or the second capping layer may be 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 the emission layer of 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 the emission layer of 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 the through 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.
The first capping layer and the second capping layer may each 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).
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.
The inorganic capping layer or the organic-inorganic composite capping layer may include the organometallic compound represented by Formula 1.
At least one of the first capping layer and the second capping layer may each independently include a carbocyclic compound, a heterocyclic compound, an amine group-containing compound, a porphine derivative, a phthalocyanine derivative, a naphthalocyanine derivative, an alkali metal complex, an alkaline earth metal complex, or any combination thereof. The carbocyclic compound, the heterocyclic compound, and the amine group-containing compound may optionally be substituted with a substituent including O, N, S, Se, Si, F, Cl, Br, I, or any combination thereof. In an embodiment, at least one of the first capping layer and the second capping layer may each independently include an amine group-containing compound.
In embodiments, at least one of the first capping layer and the second capping layer may each independently include a compound represented by Formula 201, a compound represented by Formula 202, or any combination thereof.
In embodiments, at least one of the first capping layer and the second capping layer may each independently include: one of Compounds HT28 to HT33; one of Compounds CP1 to CP6; β-NPB; or any combination thereof:
[Film]
The organometallic compound represented by Formula 1 may be included in various films. Accordingly, another aspect of the disclosure provides a film which may include an organometallic compound represented by Formula 1. The film may be, for example, an optical member (or a light control means) (for example, a color filter, a color conversion member, a capping layer, a light extraction efficiency enhancement layer, a selective light absorbing layer, a polarizing layer, a quantum dot-containing layer, or like), a light-blocking member (for example, a light reflective layer, a light absorbing layer, or the like), a protective member (for example, an insulating layer, a dielectric layer, or the like).
[Electronic Apparatus]
The light-emitting device may be included in various electronic apparatuses. For example, an electronic apparatus including the light-emitting device may be a light-emitting apparatus, an authentication apparatus, and the like.
The electronic apparatus (for example, a light-emitting apparatus) may further include, in addition to the light-emitting device, a color filter, a color conversion layer, or a color filter and a color conversion layer. The color filter and/or the color conversion layer may be arranged in at least one traveling direction of light emitted from the light-emitting device. For example, the light emitted from the light-emitting device may be blue light or white light. The light-emitting device may be the same as described herein. In an embodiment, the color conversion layer may include a quantum dot. The quantum dot may be, for example, the quantum dot as described herein.
The electronic apparatus may include a first substrate. The first substrate may include subpixels, the color filter may include color filter areas respectively corresponding to the subpixels, and the color conversion layer may include color conversion areas respectively corresponding to the subpixels.
A pixel-defining film may be arranged between the subpixels to define each subpixel.
The color filter may further include color filter areas and light-shielding patterns arranged among the color filter areas, and the color conversion layer may further include color conversion areas and light-shielding patterns arranged among 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. The quantum dot may be the same as described herein. The first area, the second area, and/or the third area may each further include a scatter.
For example, 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. The first-first color light, the second-first color light, and the third-first color light may have different maximum emission wavelengths. For example, the first light may be blue light, the first-first color light may be red light, the second-first color light may be green light, and the third-first color light may be blue light.
The electronic apparatus may further include a thin-film transistor, in addition to the light-emitting device as described herein. The thin-film transistor may include a source electrode, a drain electrode, and an activation 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, and the like.
The activation layer may include crystalline silicon, amorphous silicon, an organic semiconductor, an oxide semiconductor, and the like.
The electronic apparatus may further include a sealing portion for sealing the light-emitting device. The sealing portion may be arranged between the color filter and/or the color conversion layer and the light-emitting device. The sealing portion may allow light from the light-emitting device to be extracted to the outside, and may simultaneously prevent ambient air and moisture from penetrating into the light-emitting device. The sealing portion may be a sealing substrate including a transparent glass substrate or a plastic substrate. The sealing portion may be a thin-film encapsulation layer including an organic layer and/or an inorganic layer. When the sealing portion is a thin film encapsulation layer, the electronic apparatus may be flexible.
Various functional layers may be further included on the sealing portion, in addition to the color filter and/or the color conversion layer, according to the use of the electronic apparatus. Examples of 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 apparatus may be applied to various displays, light sources, lighting, personal computers (for example, a mobile personal computer), mobile phones, digital cameras, electronic organizers, electronic dictionaries, electronic game machines, medical instruments (for example, electronic thermometers, sphygmomanometers, blood glucose meters, pulse measurement devices, pulse wave measurement devices, electrocardiogram displays, ultrasonic diagnostic devices, or endoscope displays), fish finders, various measuring instruments, meters (for example, meters for a vehicle, an aircraft, and a vessel), projectors, and the like.
[Description of
The electronic apparatus of
The substrate 100 may be a flexible substrate, a glass substrate, or a metal substrate. A buffer layer 210 may be arranged 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 arranged on the buffer layer 210. The TFT may include an activation layer 220, a gate electrode 240, a source electrode 260, and a drain electrode 270.
The activation 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 activation layer 220 from the gate electrode 240 may be arranged on the activation layer 220, and the gate electrode 240 may be arranged on the gate insulating film 230.
An interlayer insulating film 250 may be arranged on the gate electrode 240. The interlayer insulating film 250 may be between the gate electrode 240 and the source electrode 260 to insulate the gate electrode 240 from the source electrode 250 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 arranged on the interlayer insulating film 250. The interlayer insulating film 250 and the gate insulating film 230 may be formed to expose the source region and the drain region of the activation 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 activation 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 may be provided on the passivation layer 280. The light-emitting device may include the first electrode 110, the interlayer 130, and the second electrode 150.
The first electrode 110 may be arranged on the passivation layer 280. The passivation layer 280 may be arranged to 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 arranged on the first electrode 110. The pixel defining layer 290 may expose a certain region of the first electrode 110, and an interlayer 130 may be formed in the exposed region of the first electrode 110. The pixel defining layer 290 may be a polyimide-based organic film or a polyacrylic-based organic film. Although not shown in
The second electrode 150 may be arranged on the interlayer 130, and a capping layer 170 may be further included on the second electrode 150. The capping layer 170 may be formed to cover the second electrode 150.
The encapsulation portion 300 may be arranged on the capping layer 170. The encapsulation portion 300 may be arranged on a light-emitting device to protect the light-emitting device from moisture or oxygen. The encapsulation portion 300 may include: an inorganic film including silicon nitride (SiNx), silicon oxide (SiOx), indium tin oxide, indium zinc oxide, or any combination thereof; an organic film including polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, an acrylic resin (for example, polymethyl methacrylate, polyacrylic acid, or the like), an epoxy-based resin (for example, aliphatic glycidyl ether (AGE), or the like), or any combination thereof; or any combination of the inorganic films and the organic films.
The electronic apparatus of
[Description of
The electronic equipment 1 may include a display area DA and a non-display area NDA outside the display area DA. The electronic device 1 may implement an image through an array of pixels that may be two-dimensionally arranged in the display area DA.
The non-display area NDA may be an area that does not display an image, and may entirely surround the display area DA. On the non-display area NDA, a driver for providing electrical signals or power to display elements and the like (for example, pixels) arranged on the display area DA may be arranged. On the non-display area NDA, a pad, which may be an area to which an electronic element or a printing circuit board, may be electrically connected may be arranged.
In the electronic equipment 1, a length in the x-axis direction and a length in the y-axis direction may be different from each other. In an embodiment, as shown in
[Descriptions of
Referring to
The vehicle 1000 may travel on a road or a track. The vehicle 1000 may move in a given direction according to rotation of at least one wheel. For example, the vehicle 1000 may be a three-wheeled or four-wheeled vehicle, a construction machine, a two-wheeled vehicle, a prime mover device, a bicycle, or a train running on a track.
The vehicle 1000 may include a body having an interior and an exterior, and a chassis in which mechanical apparatuses necessary for driving may be installed as other parts except for the body. The exterior of the 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 pillar 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 on 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. 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 the x-direction or the −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 the −x direction. An imaginary straight line L connecting the side window glasses 1100 may extend in the x-direction or 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 −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, side mirrors 1300 may be provided. Any 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 the 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, an odometer, 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 may be provided for adjusting an audio device, an air conditioning device, and a heater of a seat. The center fascia 1500 may be arranged on one side of the cluster 1400.
A passenger seat dashboard 1600 may be spaced apart from the cluster 1400 with the center fascia 1500 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, and the like. Although an organic light-emitting display device display including the light-emitting device according to embodiments is described as an example, various types of display devices as described herein may be used in embodiments, but embodiments are not limited thereto.
Referring to
Referring to
Referring to
[Manufacturing Method]
Respective layers included in the hole transport region, the emission layer, and respective layers included in the electron transport region may be formed in a certain region by using suitable methods selected from vacuum deposition, spin coating, casting, Langmuir-Blodgett (LB) deposition, ink-jet printing, laser-printing, laser-induced thermal imaging, and the like.
When respective layers included in the hole transport region, the emission layer, and respective layers included in the electron transport region are formed by vacuum deposition, the deposition may be performed at a deposition temperature in a range of about 100° C. to about 500° C., a vacuum degree in a range of about 10−8 torr to about 10−3 torr, and a deposition speed in a range 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 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 carbon, 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, the number of ring-forming atoms of the C1-C60 heterocyclic group may be from 3 to 61.
The term “cyclic group” as used herein may be the C3-C60 carbocyclic group or the 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 includes *—N═*′ as a ring-forming moiety.
In embodiments,
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 may be 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 the monovalent C3-C60 carbocyclic group and the 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 the divalent C3-C60 carbocyclic group and the monovalent C1-C60 heterocyclic group may include a C3-C10 cycloalkylene group, a C1-C10 heterocycloalkylene group, a C3-C10 cycloalkenylene group, a C1-C10 heterocycloalkenylene group, a C6-C60 arylene group, a C1-C60 heteroarylene group, a divalent non-aromatic condensed polycyclic group, and a 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 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 the terminus of the C2-C60 alkyl group, and examples thereof may include an ethenyl group, a propenyl group, a butenyl group, and the like. 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 the terminus of the C2-C60 alkyl group, and examples thereof may include an ethynyl group, a propynyl group, and the like. 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 the C1-C60 alkyl group), and examples thereof may include a methoxy group, an ethoxy group, an isopropyloxy group, and the like.
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, a bicyclo[2.2.2]octyl group, and the like. 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, a tetrahydrothiophenyl group, and the like. The term “C1-C10 heterocycloalkylene group” as used herein may be a divalent group having a same structure as the C1-C10 heterocycloalkyl group.
The term “C3-C10 cycloalkenyl group” as used herein may be a monovalent cyclic group that has three to ten carbon atoms and at least one carbon-carbon double bond in the ring thereof and no aromaticity, and examples thereof may include a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, and the like. The term “C3-C10 cycloalkenylene group” as used herein may be a divalent group having a same structure as the C3-C10 cycloalkenyl group.
The term “C1-C10 heterocycloalkenyl group” as used herein may be a monovalent cyclic group of 1 to 10 carbon atoms, further including, in addition to carbon atoms, at least one heteroatom, as ring-forming atoms, and having at least one carbon-carbon double bond in the cyclic structure thereof. Examples of the C1-C10 heterocycloalkenyl group may include a 4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-dihydrofuranyl group, a 2,3-dihydrothiophenyl group, and the like. The term “C1-C10 heterocycloalkenylene group” as used herein may be a divalent group having a same structure as the C1-C10 heterocycloalkenyl group.
The term “C6-C60 aryl group” as used herein may be a monovalent group having a carbocyclic aromatic system of 6 to 60 carbon atoms, 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 the 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, an ovalenyl group, and the like. 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 the C1-C60 heteroaryl group may include a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, a benzoquinolinyl group, an isoquinolinyl group, a benzoisoquinolinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthrolinyl group, a phthalazinyl group, and a naphthyridinyl group. When the C1-C60 heteroaryl group and the C1-C60 heteroarylene group each include two or more rings, the respective rings may be condensed with each other.
The term “monovalent non-aromatic condensed polycyclic group” as used herein may be a monovalent group (for example, having 8 to 60 carbon atoms) having two or more rings condensed to each other, only carbon atoms as ring-forming atoms, and no aromaticity in its entire molecular structure. Examples of the monovalent non-aromatic condensed polycyclic group may include an indenyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, an indenophenanthrenyl group, an indeno anthracenyl group, and the like. The term “divalent non-aromatic condensed polycyclic group” as used herein may be a divalent group having a same structure as the monovalent non-aromatic condensed polycyclic group described above.
The term “monovalent non-aromatic condensed heteropolycyclic group” as used herein may be a monovalent group (for example, having 1 to 60 carbon atoms) having two or more rings condensed to each other, further including, in addition to carbon atoms, at least one heteroatom, as ring-forming atoms, and having non-aromaticity in its entire molecular structure. Examples of the monovalent non-aromatic condensed heteropolycyclic group may include a pyrrolyl group, a thiophenyl group, a furanyl group, an indolyl group, a benzoindolyl group, a naphthoindolyl 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 indeno carbazolyl group, an indolocarbazolyl group, a benzofurocarbazolyl group, a benzothienocarbazolyl group, a benzosilolocarbazolyl group, a benzoindolocarbazolyl group, a benzocarbazolyl group, a benzonaphthofuranyl group, a benzonaphthothiophenyl group, a benzonaphthosilolyl group, a benzofurodibenzofuranyl group, a benzofurodibenzothiophenyl group, and a benzothienodibenzothiophenyl group. The term “divalent non-aromatic condensed heteropolycyclic group” as used herein may be a divalent group having a same structure as the monovalent non-aromatic condensed heteropolycyclic group described above.
The term “C6-C60 aryloxy group” as used herein may be a group represented by —O(A102) (wherein A102 may be the 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 the C6-C60 aryl group).
The term “C7-C60 arylalkyl group” as used herein may be a group represented by -(A104)(A105) (wherein A104 may be a C1-C54 alkylene group, and A105 may be a C6-C59 aryl group), and the term “C2-C60 heteroarylalkyl group” as used herein may be a group represented by -(A106)(A107) (wherein A106 may be a C1-C59 alkylene group, and A107 may be a C1-C59 heteroaryl group).
The group “R10a” as used herein 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; —Cl; —Br; —I; a hydroxyl group; a cyano group; a nitro group; 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; a C7-C60 arylalkyl group; or a C2-C60 heteroarylalkyl group.
The term “heteroatom” as used herein refers to any atom other than a carbon atom or a hydrogen atom. Examples of the heteroatom may include O, S, N, P, Si, B, Ge, Se, or any combination thereof.
In the specification, the third-row transition metal may include hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), and the like.
In the specification, the term “Ph” refers to a phenyl group, the term “Me” refers to a methyl group, the term “Et” refers to an ethyl group, the terms “tert-Bu” or “But” each refer to a tert-butyl group, and the term “OMe” 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.
In the specification, the x-axis, y-axis, and z-axis are not limited to three axes in an orthogonal coordinate system, and may be interpreted in a broad sense including these axes. For example, the x-axis, y-axis, and z-axis may refer to those orthogonal to each other, or may refer to those in different directions that may not be orthogonal to each other.
Hereinafter, compounds according to embodiments and light-emitting devices according to embodiments will be described in detail with reference to the following Synthesis Examples and Examples. The wording “B was used instead of A” used in describing Synthesis Examples means that an identical molar equivalent of B was used in place of A.
(1) Synthesis of Intermediate Compound 1-a
2,6-dibromoaniline (1.0 eq), phenyl boronic acid (2.7 eq), Pd(PPh3)4 (10 mol %), sodium carbonate (3.0 eq), and tetrabutylammonium bromide (20 mol %) were dissolved in a mixed solution of 1,4-dioxane and H2O (at a volume ratio of 4:1) (0.1 M), and stirred at 100° C. for 12 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using ethyl acetate (EA) and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using EA and hexane at a volume ratio of 1:20) to consequently separate Intermediate Compound 1-a (yield of 90%).
(2) Synthesis of Intermediate Compound 1-b
1-iodo-2-nitrobenzene (1.2 eq), Intermediate Compound 1-a (1.0 eq), Pd2(dba)3 (10 mol %), Sphos (15 mol %), and sodium tert-butoxide (3.0 eq) were dissolved in toluene (0.1 M), and stirred at 110° C. for 12 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at a volume ratio of 1:20) to separate Intermediate Compound 1-b (yield of 74%).
(3) Synthesis of Intermediate Compound 1-c
Intermediate Compound 1-b (1.0 eq), Sn (1.5 eq), and HCl (30 eq) were dissolved in ethanol, and stirred at 80° C. for 12 hours to prepare reactants. The reactants were cooled at room temperature, and neutralized by using a NaOH solution. An extraction process was performed on the neutralizer three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was filtered through Celite/silica gel. The filtrate was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at volume ratio of 1:3) to separate Intermediate Compound 1-c (yield of 91%).
(4) Synthesis of Intermediate Compound 1-d
9-(4-bromopyridin-2-yl)-2-methoxy-9H-carbazole (1.1 eq), 2,6-diphenylphenol (1.0 eq), CuI (10 mol %), trans-1,2-cyclohexadiamine (20 mol %), and potassium phosphate tribasic (2.0 eq) were dissolved in DMF (0.1 M), and stirred at 160° C. for 16 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using EA and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at a volume ratio of 1:1) to separate Intermediate Compound 1-d (yield of 55%).
(5) Synthesis of Intermediate Compound 1-e
Intermediate Compound 1-d (1.0 eq) was dissolved in MC (0.1 M) to prepare reactants. A 1.0 M BBr3 solution in MC (2.0 eq) was slowly added to the reactants at 0° C., and stirred for 1 hour. Afterwards, the reaction product was further stirred for 2 hours at room temperature. Distilled water (0.1 M) was added thereto, and the reaction solution was stirred at room temperature for 1 hour. An extraction process was performed thereon three times by using MC and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, and filtered through silica gel to separate Intermediate Compound 1-e (yield: 60%).
(6) Synthesis of Intermediate Compound 1-f
1,3-dibromobenzene (1.2 eq), Intermediate Compound 1-e (1.0 eq), CuI (10 mol %), 2-picolinic acid (20 mol %), and potassium phosphate tribasic (2.0 eq) were dissolved in DMSO (0.1 M), and stirred at 110° C. for 12 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using EA and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using EA and hexane at a volume ratio of 1:4) to consequently separate Intermediate Compound 1-f (yield of 66%).
(7) Synthesis of Intermediate Compound 1-g
Intermediate Compound 1-c (1.2 eq), Intermediate Compound 1-e (1.0 eq), Pd2(dba)3 (5 mol %), Sphos (7 mol %), and sodium tert-butoxide (2.0 eq) were dissolved in toluene (0.1 M) and stirred at 110° C. for 3 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using EA and hexane at a volume ratio of 1:9) to separate Intermediate Compound 1-g (yield: 88%).
(8) Synthesis of Intermediate Compound 1-h
Intermediate compound 1-g (1.0 eq) was dissolved in triethyl orthoformate (30 eq), and 37% HCl (1.5 eq) was added thereto. The resulting solution was stirred at 80° C. for 12 hours to prepare reactants. After the reactants were cooled at room temperature, triethyl orthoformate among the reactants was concentrated. An extraction process was performed on the reactants three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and methanol at a volume ratio of 95:5) to separate Intermediate Compound 1-h (yield of 90%).
(9) Synthesis of Intermediate Compound 1-i
Intermediate Compound 1-h (1.0 eq) and ammonium hexafluorophosphate (3.0 eq) were dissolved in methanol (0.5 M), and distilled water was added thereto. The resulting solution was stirred at room temperature for 3 hours to prepare reactants. The reactants were washed with distilled water and filtered to obtain a solid product. An extraction process was performed on the solid product three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, and concentrated to separate Intermediate compound 1-i (yield of 93%).
(10) Synthesis of Compound 1
Intermediate Compound 1-i, dichloro(1,5-cyclooctadiene)platinum(II) (1.1 eq), and sodium acetate (2.0 eq) were dissolved in a 1,4-dioxane (0.05 M), and stirred in a nitrogen atmosphere and at a temperature of 120° C. for 4 days to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at a volume ratio of 3:7) to separate Compound 1 (yield: 22%).
(1) Synthesis of Intermediate Compound 153-a
1,3-dibromo-5-tert-butylbenzene (1.2 eq), phenyl boronic acid (1.0 eq), Pd(PPh3)4 (10 mol %), and potassium carbonate (3.0 eq) were dissolved in a mixed solution of toluene and H2O (at a volume ratio of 4:1) (0.1 M), and stirred at 100° C. for 12 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using EA and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using hexane) to separate Intermediate Compound 153-a (yield of 57%).
(2) Synthesis of Intermediate Compound 153-b
Intermediate Compound 153-a (1.0 eq), bis(pinacolato)diboron (1.2 eq), Pd(dppf)Cl2 (5 mol %), and potassium acetate (2.0 eq) were dissolved in dioxane (0.1 M), and stirred at 100° C. for 15 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using EA and hexane at a volume ratio of 1:20) to consequently separate Intermediate Compound 153-b (yield of 81%).
(3) Synthesis of Intermediate Compound 153-c
3-bromo-2-methoxy-1,1′-biphenyl-2′,3′,4′,5′,6′-d5 (1.2 eq), Intermediate Compound 153-b (1.0 eq), Pd(PPh3)4 (5 mol %), and potassium carbonate (3.0 eq) were dissolved in a mixed solution of toluene and H2O (at a volume ratio of 4:1) (0.1 M), and stirred at 100° C. for 12 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using EA and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at a volume ratio of 1:4) to consequently separate Intermediate Compound 153-c (yield of 80%).
(2) Synthesis of Intermediate Compound 153-d
Intermediate Compound 153-c (1.0 eq) was dissolved in MC (0.1 M) to prepare reactants. A 1.0 M BBr3 solution in MC (2.0 eq) was slowly added to the reactants at 0° C., and stirred for 1 hour. The reaction product was further stirred for 2 hours at room temperature. Distilled water (0.1 M) was added thereto, and the reaction solution was stirred at room temperature for 1 hour. The extraction process was performed on the reactants three times by using MC and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, and filtered through silica gel to separate Intermediate Compound 153-d (yield: 72%).
(5) Synthesis of Intermediate Compound 153-e
9-(4-bromopyridin-2-yl)-2-methoxy-9H-carbazole (1.1 eq), Intermediate Compound 153-d (1.0 eq), CuI (10 mol %), trans-1,2-cyclohexadiamine (20 mol %), and potassium phosphate tribasic (2.0 eq) were dissolved in DMF (0.1 M), and stirred at 160° C. for 16 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using EA and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at a volume ratio of 1:1) to consequently separate Intermediate Compound 153-e (yield of 52%).
(6) Synthesis of Intermediate Compound 153-f
Intermediate Compound 153-c (1.0 eq) was dissolved in MC (0.1 M) to prepare reactants. A 1.0 M BBr3 solution in MC (2.0 eq) was slowly added to the reactants at 0° C., and stirred for 1 hour. The reaction product was further stirred for 2 hours at room temperature. Distilled water (0.1 M) was added thereto, and the reaction solution was stirred at room temperature for 1 hour. An extraction process was performed thereon three times by using MC and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, and filtered through silica gel to separate Intermediate Compound 153-f (yield: 67%).
(7) Synthesis of Intermediate Compound 153-g
1,3-dibromobenzene (1.2 eq), Intermediate Compound 153-f (1.0 eq), CuI (10 mol %), 2-picolinic acid (20 mol %), and potassium phosphate tribasic (2.0 eq) were dissolved in DMSO (0.1 M), and stirred at 110° C. for 12 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using EA and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at a volume ratio of 1:1) to consequently separate Intermediate Compound 153-g (yield of 50%).
(8) Synthesis of Intermediate Compound 153-h
Intermediate Compound 1-c (1.2 eq), Intermediate Compound 153-g (1.0 eq), Pd2(dba)3 (5 mol %), Sphos (7 mol %), and sodium tert-butoxide (2.0 eq) were dissolved in toluene (0.1 M) and stirred at 110° C. for 3 hours to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using EA and hexane at a volume ratio of 1:9) to separate Intermediate Compound 153-h (yield: 90%).
(9) Synthesis of Intermediate Compound 153-i
Intermediate compound 153-h (1.0 eq) was dissolved in triethyl orthoformate (30 eq), and 37% HCl (1.5 eq) was added thereto. The resulting solution was stirred at 80° C. for 12 hours to prepare reactants. After the reactants were cooled at room temperature, triethyl orthoformate among the reactants was concentrated, and an extraction process was performed thereon three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and methanol at a volume ratio of 95:5) to separate Intermediate Compound 153-i (yield of 90%).
(10) Synthesis of Intermediate Compound 153-j
Intermediate Compound 153-i (1.0 eq) and ammonium hexafluorophosphate (3.0 eq) were dissolved in methanol (0.5 M), and distilled water was added thereto. The resulting solution was stirred at room temperature for 3 hours to prepare reactants. The reactants were washed with distilled water and filtered to obtain a solid product. An extraction process was performed on the solid product three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate and concentrated to synthesize Intermediate Compound 153-j (yield: 92%).
(11) Synthesis of Compound 153
Intermediate Compound 153-i, dichloro(1,5-cyclooctadiene)platinum(II) (1.1 eq), and sodium acetate (2.0 eq) were dissolved in anhydrous 1,4-dioxane (0.05 M), and stirred in a nitrogen atmosphere and at a temperature of 120° C. for 4 days to prepare reactants. The reactants were cooled at room temperature, and an extraction process was performed thereon three times by using dichloromethane and water to obtain an organic layer. The organic layer thus obtained was dried by using magnesium sulfate, concentrated, and subjected to column chromatography (using MC and hexane at a volume ratio of 3:7) to separate Compound 153 (yield: 20%).
1H NMR and MS/FAB of the compounds synthesized according to Synthesis Examples are shown in Table 1.
1H NMR (CDCl3, 400 MHz)
Regarding the compounds of Synthesis Examples above, the LUMO and HOMO energy values were measured according to methods described in Table 2, and λmaxsim, T1, 3MLCT values were calculated according to the DFT method of the Gaussian 09 program (structural optimization at B3LYP, 6-311G(d,p) levels). The results are shown in Table 3.
To evaluate λmaxexp, each of the compounds according to Synthesis Examples above was dissolved in a toluene solvent, wherein a concentration of each solution was 1.40×10−6 mol. Each solution was placed in a quartz cell, and a photoluminescence (PL) spectrum was measured for each cell.
3MLCT
Structural formulae of Comparative Compounds 1 to 3 are as follows:
Referring to Table 3, it was confirmed that Compounds 1 and 153 had a high T1 energy level and improved 3MLCT efficiency, as compared to Comparative Compounds 1 to 3. Consequently, Compounds 1 and 153 were able to emit blue light with high efficiency unlike Comparative Compounds 1 to 3, and internal decomposition of the compounds may be delayed.
A substrate on which an ITO anode was deposited was prepared with a size of 50 mm×50 mm×0.7 mm. The substrate was ultrasonically cleaned by using isopropyl alcohol and pure water for 5 minutes each. Ultraviolet rays were irradiated on the substrate for 30 minutes, and the resulting substrate was exposed to ozone for cleaning. The cleaned substrate was mounted on a vacuum deposition apparatus.
Compound 2-TNATA was vacuum-deposited on the ITO substrate to form a hole injection layer having a thickness of 600 Å. 4,4′-bis[N-(1-naphthyl)-N-phenyl amino biphenyl (hereinafter referred to as NPB) was vacuum-deposited on the hole injection layer to form a hole transport layer having a thickness of 300 Å.
3,3-di(9H-carbazol-9-yl)biphenyl (mCBP) as a host and Compound 1 as a dopant were co-deposited on the hole transport layer at a weight ratio of 90:10 to form an emission layer having a thickness of 300 Å.
Diphenyl(4-(triphenylsilyl)phenyl)-phosphine oxide) (TSPO1) was vacuum-deposited on the emission layer to form a hole blocking layer having a thickness of 50 Å. Alq3 was deposited on the emission layer to form an electron transport layer having a thickness of 300 Å. LiF which is a halogenated alkali metal was deposited on the electron transport layer to form an electron injection layer having a thickness of 10 Å. Al was vacuum-deposited on the electron injection layer to form a LiF/Al cathode having a thickness 3,000 Å, thereby completing the manufacture of a light-emitting device.
Light-emitting devices were manufactured in the same manner as in Example 1, except that, for use as a dopant in forming an emission layer, corresponding compounds shown in Table 4 were used instead of Compound 1.
A voltage was supplied so that the light-emitting devices manufactured according to Examples 1 and 2 and Comparative Examples 1 to 3 had a current density of 50 mA/cm2. Driving voltage (V), current density (mA/cm2), luminance (cd/m2), luminescence efficiency (cd/A), emission color, and emission wavelength (nm) were each measured by using Keithley MU 236 and luminance meter PR650, and results thereof are shown in Table 4.
Referring to Table 4, it was confirmed that each of the light-emitting device of Examples 1 and 2 had high efficiency and a long lifespan, as compared to the light-emitting device of Comparative Examples 1 to 3. It was confirmed that each of the light-emitting devices of Examples 1 and 2 stably emitted blue light, unlike the light-emitting devices of Comparative Examples 2 and 3.
A light-emitting device including the organometallic compound according to an embodiment may have a low driving voltage, high luminance and efficiency, and a long lifespan.
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 |
|---|---|---|---|
| 10-2022-0081496 | Jul 2022 | KR | national |
