Patent Application
20220399508
This application claims priority to and the benefit of Korean Patent Application No. 10-2021-0064311 filed in the Korean Intellectual Property Office on May 18, 2021, and Korean Patent Application No. 10-2022-0059688 filed in the Korean Intellectual Property Office on May 16, 2022, the entire contents of which are incorporated herein by reference.
Embodiments relate to a composition for an organic optoelectronic device, an organic optoelectronic device, and a display device.
An organic optoelectronic device (e.g., organic optoelectronic diode) is a device capable of converting electrical energy and optical energy to each other.
An organic optoelectronic device may be classified as follows in accordance with its driving principles. One is a photoelectric device that generates electrical energy by separating excitons formed by light energy into electrons and holes, and transferring the electrons and holes to different electrodes, respectively and the other is light emitting device that generates light energy from electrical energy by supplying voltage or current to the electrodes.
Examples of the organic optoelectronic device may include an organic photoelectric element, an organic light emitting diode, an organic solar cell, and an organic photo conductor drum.
Of these, an organic light emitting diode (OLED) has recently drawn attention due to an increase in demand for flat panel displays. The organic light emitting diode is a device that converts electrical energy into light, and the performance of the organic light emitting diode is greatly influenced by an organic material between electrodes.
The embodiments may be realized by providing a composition for an organic optoelectronic device, the composition including a first compound represented by Chemical Formula 1, and a second compound represented by Chemical Formula 4,
wherein in Chemical Formula 1, AO is a substituted or unsubstituted C6 to C20 aryl group, Are is a group represented by Chemical Formula 2-1, Chemical Formula 2-2, or Chemical Formula 2-3, and Ar3 is a group represented by Chemical Formula 3-1, Chemical Formula 3-2, or Chemical Formula 3-3,
in Chemical Formula 2-1, Chemical Formula 2-2, Chemical Formula 2-3, Chemical Formula 3-1, Chemical Formula 3-2, and Chemical Formula 3-3, X1 and X2 are each independently O or S, R1 to R4 are each independently hydrogen, deuterium, a cyano group, a halogen, a substituted or unsubstituted C1 to C20 alkyl group, or a substituted or unsubstituted C6 to C20 aryl group, Ra, Rb, Rc, and Rd are each independently a substituted or unsubstituted C6 to C20 aryl group that does not include a fused ring, m1 and m3 are each independently an integer of 0 to 3, m2 and m4 are each independently an integer of 0 to 4, and satisfy the following relation: m1+m2+m3+m4 ≥1, and * is a linking point;
in Chemical Formula 4, Ar4 and Ar5 are each independently a substituted or unsubstituted C6 to C20 aryl group, R5 to R10 are each independently hydrogen, deuterium, a cyano group, a halogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group, and m5, m7 and m10 are each independently an integer of 1 to 4, m6, m8 and m9 are each independently an integer of 1 to 3.
The embodiments may be realized by providing an organic optoelectronic device including an anode and a cathode facing each other, and at least one organic layer between the anode and the cathode, wherein the at least one organic layer includes a light emitting layer, and the light emitting layer includes the composition for an organic optoelectronic device according to an embodiment.
The embodiments may be realized by providing a display device including the organic optoelectronic device according to an embodiment.
Features will be apparent to those of skill in the art by describing in detail exemplary embodiments with reference to the attached drawing, in which:
The
Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may 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 exemplary implementations to those skilled in the art.
In the drawing figures, the dimensions of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as being “on” another layer or element, it can be directly on the other layer or element, or intervening layers may also be present. In addition, it will also be understood that when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. Like reference numerals refer to like elements throughout.
In one example of the present disclosure, “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a halogen, a hydroxyl group, an amino group, a substituted or unsubstituted C1 to C30 amine group, a nitro group, a substituted or unsubstituted C1 to C40 silyl group, a C1 to C30 alkyl group, a C1 to C10 alkylsilyl group, a C6 to C30 arylsilyl group, a C3 to C30 cycloalkyl group, a C3 to C30 heterocycloalkyl group, a C6 to C30 aryl group, a C2 to C30 heteroaryl group, a C1 to C20 alkoxy group, a C1 to C10 trifluoroalkyl group, a cyano group, or a combination thereof. As used herein, the term “or” is not an exclusive term, e.g., “A or B” would include A, B, or A and B.
In specific example of the present disclosure, the “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a C1 to C30 alkyl group, a C1 to C10 alkylsilyl group, a C6 to C30 arylsilyl group, a C3 to C30 cycloalkyl group, a C3 to C30 heterocycloalkyl group, a C6 to C30 aryl group, a C2 to C30 heteroaryl group, or a cyano group. In specific example of the present disclosure, the “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a C1 to C20 alkyl group, a C6 to C30 aryl group, or a cyano group. In specific example of the present disclosure, the “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a C1 to C5 alkyl group, a C6 to C18 aryl group, or a cyano group. In specific example of the present disclosure, the “substituted” refers to replacement of at least one hydrogen of a substituent or a compound by deuterium, a cyano group, a methyl group, an ethyl group, a propyl group, a butyl group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group.
As used herein, “unsubstituted” refers to hydrogen remaining without substituting to or replacing with any other substituents.
As used herein, “hydrogen substitution (-H)” may also include “deuterium substitution (-D)” or “tritium substitution (-T)”.
As used herein, when a definition is not otherwise provided, “hetero” refers to one including one to three heteroatoms selected from N, O, S, P, and Si, and remaining carbons in one functional group.
As used herein, “an aryl group” refers to a group including at least one hydrocarbon aromatic moiety, and all elements of the hydrocarbon aromatic moiety have p-orbitals which form conjugation, for example a phenyl group, a naphthyl group, and the like, two or more hydrocarbon aromatic moieties may be linked by a sigma bond and may be, for example a biphenyl group, a terphenyl group, a quarterphenyl group, and the like, and two or more hydrocarbon aromatic moieties are fused directly or indirectly to provide a non-aromatic fused ring, for example a fluorenyl group.
The aryl group may include a monocyclic, polycyclic, or fused ring polycyclic (i.e., rings sharing adjacent pairs of carbon atoms) functional group.
As used herein, “a heterocyclic group” is a generic concept of a heteroaryl group, and may include at least one heteroatom selected from N, O, S, P, and Si instead of carbon (C) in a cyclic compound such as an aryl group, a cycloalkyl group, a fused ring thereof, or a combination thereof. When the heterocyclic group is a fused ring, the entire ring or each ring of the heterocyclic group may include one or more heteroatoms.
For example, “a heteroaryl group” may refer to an aryl group including at least one heteroatom selected from N, O, S, P, and Si. Two or more heteroaryl groups are linked by a sigma bond directly, or when the heteroaryl group includes two or more rings, the two or more rings may be fused. When the heteroaryl group is a fused ring, each ring may include one to three heteroatoms.
More specifically, the substituted or unsubstituted C6 to C30 aryl group may be a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted naphthacenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted p-terphenyl group, a substituted or unsubstituted m-terphenyl group, a substituted or unsubstituted o-terphenyl group, a substituted or unsubstituted chrysenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted perylenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted indenyl group, a substituted or unsubstituted furanyl group, or a combination thereof, but is not limited thereto.
More specifically, the substituted or unsubstituted C2 to C30 heterocyclic group may be a substituted or unsubstituted thiophenyl group, a substituted or unsubstituted pyrrolyl group, a substituted or unsubstituted pyrazolyl group, a substituted or unsubstituted imidazolyl group, a substituted or unsubstituted triazolyl group, a substituted or unsubstituted oxazolyl group, a substituted or unsubstituted thiazolyl group, a substituted or unsubstituted oxadiazolyl group, a substituted or unsubstituted thiadiazolyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted benzimidazolyl group, a substituted or unsubstituted indolyl group, a substituted or unsubstituted quinolinyl group, a substituted or unsubstituted isoquinolinyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted naphthyridinyl group, a substituted or unsubstituted benzoxazinyl group, a substituted or unsubstituted benzthiazinyl group, a substituted or unsubstituted acridinyl group, a substituted or unsubstituted phenazinyl group, a substituted or unsubstituted phenothiazinyl group, a substituted or unsubstituted phenoxazinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof, but is not limited thereto.
In the present specification, hole characteristics refer to an ability to donate an electron to form a hole when an electric field is applied and that a hole formed in the anode may be easily injected into the light emitting layer and transported in the light emitting layer due to conductive characteristics according to a highest occupied molecular orbital (HOMO) level.
In addition, electron characteristics refer to an ability to accept an electron when an electric field is applied and that electron formed in the cathode may be easily injected into the light emitting layer and transported in the light emitting layer due to conductive characteristics according to a lowest unoccupied molecular orbital (LUMO) level.
Hereinafter, a composition for an organic optoelectronic device according to an embodiment is described.
A composition for an organic optoelectronic device according to an embodiment may include, e.g., a first compound represented by Chemical Formula 1, and a second compound represented by Chemical Formula 4.
In Chemical Formula 1, AO may be or may include, e.g., a substituted or unsubstituted C6 to C20 aryl group.
Ar2 may be, e.g., a group represented by Chemical Formula 2-1, Chemical Formula 2-2, or Chemical Formula 2-3.
Ar3 may be, e.g., a group represented by Chemical Formula 3-1, Chemical Formula 3-2, or Chemical Formula 3-3.
In Chemical Formula 2-1, Chemical Formula 2-2, Chemical Formula 2-3, Chemical Formula 3-1, Chemical Formula 3-2 and Chemical Formula 3-3, X1 and X2 may each independently be, e.g., O or S.
R1 to R4 are each independently hydrogen, deuterium, a cyano group, a halogen, a substituted or unsubstituted C1 to C20 alkyl group, or a substituted or unsubstituted C6 to C20 aryl group.
Ra, Rb, Rc, and Rd may each independently be or include, e.g., a substituted or unsubstituted C6 to C20 aryl group. In an implementation, Ra, Rb, Rc, and Rd may not include a fused ring.
m1 and m3 are each independently an integer of 0 to 3, m2 and m4 are each independently an integer of 0 to 4, and may satisfy the following relation: m1+m2+m3+m4 ≥1.
*is a linking point.
In Chemical Formula 4, Ar4 and Ar5 may each independently be or include, e.g., a substituted or unsubstituted C6 to C20 aryl group.
R5 to R10 may each independently be or include, e.g., hydrogen, deuterium, a cyano group, a halogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group.
m5, m7 and m10 may each independently be, e.g., an integer of 1 to 4.
m6, m8 and m9 may each independently be, e.g., an integer of 1 to 3.
The first compound may have two dibenzofuran or dibenzothiophene rings as substituents on a center or core of triazine. In an implementation, at least one of the two dibenzofuran or dibenzothiophene rings is necessarily substituted with an aryl group and the aryl group substituted on the dibenzofuran or dibenzothiophene ring may not include a fused aryl group. By having two dibenzofuran or dibenzothiophene rings as substituents on the triazine core, a low-actuation and high-efficiency device may be manufactured due to the effect of improving electron mobility. In addition, at least one of the two dibenzofuran or dibenzothiophene rings is necessarily substituted with an aryl group, and the aryl group substituted on the dibenzofuran or dibenzothiophene ring may not include a fused aryl group. Thereby, a deposition temperature and a glass transition temperature may be finely tuned, and thus, it is possible to synthesize a material having a low deposition temperature and a high glass transition temperature compared to the same molecular weight. The fused aryl group may be an aryl group sharing a carbon-carbon bond (e.g., in which different rings share a carbon-carbon bond), and may refer to an aryl group such as a naphthyl group.
In an implementation, the second compound may have a structure in which a carbazolyl group is substituted at a N-position of a bicarbazole skeleton.
By having a structure in which three carbazoles are linked as described above, compared to other materials having one or two carbazoles, a material with improved hole transport properties may be implemented, thereby lowering the driving voltage. In addition, a balance of electrons and holes is improved, enabling high efficiency and long life-span.
In an implementation, Ar2 in Chemical Formula 1 may be, e.g., a substituent of Group IA or Group II.
Ar3 may be, e.g., a substituent of Group IB or Group III.
In an implementation, Ar2 and Ar3 may not be substituents of Group IA and Group IB, respectively, at the same time. For example, when Ar2 is a substituent of Group IA, Ar3 may not be a substituent of Group IB, and vice versa.
[Group IA]
In Group IA, Group IB, Group II, and Group III, X1, X2, R1 to R4, RaRb, Rc, and Rd may be defined the same as those described above (e.g., in Chemical Formula 1).
Rb1, Rb2, Rd1, and Rd2 may each independently be, e.g., a substituted or unsubstituted C6 to C20 aryl group. In an implementation, Rb1, Rb2, Rd1 and Rd2 may not be or include a fused ring.
*is a linking point.
In an implementation, m1 to m4 may each independently be 0 or 1, and may satisfy the following relation: 1≤m1+m2+m3+m4≤3.
In an implementation, Ra, Rb, Rb1, Rb2, Rc, Rd, Rd1, and Rd2 may each independently be, e.g., a substituted or unsubstituted C6 to C12 aryl group.
In an implementation, Ra, Rb, Rb1, Rb2, Rc, Rd, Rd1, and Rd2 may each independently be, e.g., a substituted or unsubstituted phenyl group or a substituted or unsubstituted biphenyl group.
In an implementation, each of Ra, Rb, Rb1, Rb2, Rc, Rd, Rd1 and Rd2 may independently be, e.g., a substituent of Group IV.
In Group IV, D is deuterium.
m11 may be, e.g., an integer of 1 to 5.
m12 may be, e.g., an integer of 1 to 4.
*is a linking point.
In an implementation, AO may be, e.g., a substituted or unsubstituted C6 to C18 aryl group.
In an implementation, AO may be, e.g., a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, or a substituted or unsubstituted terphenyl group.
In an implementation, the first compound may be a compound of Group 1.
In an implementation, the second compound represented by Chemical Formula 4 may be, e.g., a compound of the Chemical Formulae of Group V.
In Group V, Ar4, Ar5, R5 to R10 and m5 to m10 may be defined the same as those described above.
In an implementation, Ar4 and Ar5 may each independently be, e.g., a substituted or unsubstituted C6 to C12 aryl group.
In an implementation, Ar4 and Ar5 may each independently be, e.g., a substituted or unsubstituted phenyl group or a substituted or unsubstituted biphenyl group.
In an implementation, Ar4 and Ar5 may each independently, e.g., a substituent of Group VI.
In Group VI, D is deuterium.
m13 may be, e.g., an integer of 1 to 5.
m14 may be, e.g., an integer of 1 to 4.
m15 may be, e.g., an integer of 1 to 7.
*is a linking point.
In an implementation, R5 to R10 of Chemical Formula 4 may each independently be, e.g., hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, or a substituted or unsubstituted C6 to C12 aryl group.
In an implementation, R5 to R10 of Chemical Formula 4 may each independently be, e.g., hydrogen or deuterium.
In an implementation, the second compound may be, e.g., a compound of
Group 2.
In an implementation, the composition for an organic optoelectronic device may include, e.g., a first compound in which Are of Chemical Formula 1 is represented by Chemical Formula 2-3 and Ar3 is represented by Chemical Formula 3-3 and a second compound represented by Chemical Formula 4-5, Chemical Formula 4-6, 4-7, Chemical Formula 4-11, or Chemical Formula 4-16.
In an implementation, the composition for an organic optoelectronic device may include, e.g., a first compound in which Ar2 of Chemical Formula 1 is represented by Chemical Formula 1-1, Chemical Formula 1-3, Chemical Formula 2-33, or Chemical Formula 2-35, and Ar3 is represented by Chemical Formula 1-4, Chemical Formula 1-6, Chemical Formula 3-31, Chemical Formula 3-32, Chemical Formula 3-33 or Chemical Formula 3-35, provided that when Ar2 is Chemical Formula 1-1 or Chemical Formula 1-3, Ar3 is not Chemical Formula 1-4 or Chemical Formula 1-6, and when Ar3 is Chemical Formula 1-4 or Chemical Formula 1-6, Ar2 is not Chemical Formula 1-1 and Chemical Formula 1-3, and the second compound represented by Chemical Formula 4-11.
In an implementation, the composition for an organic optoelectronic device may include, e.g., a first compound in which Ar2 of Chemical Formula 1 is represented by Chemical Formula 1-1, Chemical Formula 1-3, Chemical Formula 2-31, Chemical Formula 2-32, Chemical Formula 2-33, or Chemical Formula 2-35, Ar3 is represented by Chemical Formula 1-4, Chemical Formula 1-6, Chemical Formula 3-33, or Chemical Formula 3-35, provided that when Ar2 is Chemical Formula 1-1 or Chemical Formula 1-3, Ar3 is not Chemical Formula 1-4 or Chemical Formula 1-6, and when Ar3 is Chemical Formula 1-4 or Chemical Formula 1-6, Ar2 is not Chemical Formula 1-1 and Chemical Formula 1-3, and the second compound represented by Chemical Formula 4-11.
In an implementation, in the first compound included in the composition for an organic optoelectronic device, Ar2 of Chemical Formula 1 may be represented by Chemical Formula 1-3 and Ar3 may be represented by Chemical Formula 3-31, or Ar2 of Chemical Formula 1 may be represented by Chemical Formula 2-31 and Ar3 may be represented by Chemical Formula 1-6.
The first compound and the second compound may be included (e.g., mixed) in a weight ratio of, e.g., about 1:99 to about 99:1. Within the above range, bipolar characteristics may be implemented by adjusting the weight ratio using the hole transport capability of the first compound and the electron transport capability of the second compound, so that efficiency and life-span may be improved. Within the above range, the first compound and the second compound may be, e.g., included in a weight ratio of about 90:10 to about 10:90, about 80:20 to about 10:90, about 70:30 to about 10:90, or about 60:40 to about 10:90. In an implementation, they may be included in a weight ratio of about 50:50 to about 10:90, e.g., about 40:60 to about 10:90.
In an implementation, they may be included in a weight ratio of about 30:70 to about 10:90.
In an implementation, the first compound and the second compound may each be included as a host of a light emitting layer, e.g., a phosphorescent host.
Hereinafter, an organic optoelectronic device including the aforementioned composition for an organic optoelectronic device is described.
The organic optoelectronic device may be a suitable device to convert electrical energy into photoenergy and vice versa, and may be, e.g., an organic photoelectric device, an organic light emitting diode, an organic solar cell, or an organic photoconductor drum.
Herein, an organic light emitting diode as one example of an organic optoelectronic device is described referring to the drawing.
The
Referring to the FIGURE, an organic light emitting diode 100 according to an embodiment may include an anode 120 and a cathode 110 facing each other and an organic layer 105 between the anode 120 and cathode 110.
The anode 120 may be made of a conductor having a large work function to help hole injection, and may be, e.g., a metal, a metal oxide, or a conductive polymer. The anode 120 may be, e.g., a metal such as nickel, platinum, vanadium, chromium, copper, zinc, gold, or the like, or an alloy thereof; a metal oxide such as zinc oxide, indium oxide, indium tin oxide (ITO), indium zinc oxide (IZO), and the like; a combination of a metal and an oxide such as ZnO and Al or SnO2 and Sb; a conductive polymer such as poly(3-methylthiophene), poly(3,4-(ethylene-1,2-dioxy)thiophene) (PEDOT), polypyrrole, or polyaniline.
The cathode 110 may be made of a conductor having a small work function to help electron injection, and may be, e.g., a metal, a metal oxide, or a conductive polymer. The cathode 110 may be, e.g., a metal such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum silver, tin, lead, cesium, barium, or the like, or an alloy thereof; or a multi-layer structure material such as LiF/Al, LiO2/Al, LiF/Ca, LiF/Al, or BaF2/Ca.
The organic layer 105 may include the aforementioned composition for an organic optoelectronic device.
The organic layer 105 may include, e.g., the light emitting layer 130, and the light emitting layer 130 may include, e.g., the aforementioned composition for an organic optoelectronic device.
The light emitting layer 130 may include, e.g., the aforementioned composition for an organic optoelectronic device as a phosphorescent host.
In addition to the aforementioned host, the light emitting layer may further include one or more compounds.
The light emitting layer may further include a dopant. The dopant may be, e.g., a phosphorescent dopant, such as a red, green or blue phosphorescent dopant, and may be, e.g., a red phosphorescent dopant.
The composition for an organic optoelectronic device further including a dopant may be, e.g., a red-light emitting composition.
A dopant is a material that emits light by being mixed in a small amount with a compound or composition for an organic optoelectronic device. In general, the dopant may be a material such as a metal complex that emits light by multiple excitation into a triplet or more. The dopant may be, for example, an inorganic, organic, or organic-inorganic compound, and may include one or two or more.
An example of the dopant may be a phosphorescent dopant, and examples of the phosphorescent dopant may include an organometallic compound including Ir, Pt, Os, Ti, Zr, Hf, Eu, Tb, Tm, Fe, Co, Ni, Ru, Rh, Pd, or a combination thereof. The phosphorescent dopant may be, e.g., a compound represented by Chemical Formula Z.
[Chemical Formula Z]
LMX3
In Chemical Formula Z, M may be, e.g., a metal, and L and X3 may each independently be, e.g., ligands forming a complex compound with M.
In an implementation, M may be, e.g., Ir, Pt, Os, Ti, Zr, Hf, Eu, Tb, Tm, Fe, Co, Ni, Ru, Rh, Pd, or a combination thereof, and L and X3 may be, e.g., a bidentate ligand.
In an implementation, the ligand represented by L and X3 may be, e.g., a ligand of Group A.
In Group A, R300 to R302 may each independently be, e.g., hydrogen, deuterium, a C1 to C30 alkyl group substituted or unsubstituted with a halogen, a C6 to C30 aryl group substituted or unsubstituted with a C1 to C30 alkyl group, or a halogen.
R303 to R324 may each independently be, e.g., hydrogen, deuterium, a halogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C1 to C30 heteroaryl group, a substituted or unsubstituted C1 to C30 amino group, a substituted or unsubstituted C6 to C30 arylamino group, SF5, a trialkylsilyl group having a substituted or unsubstituted C1 to C30 alkyl group, a dialkylarylsilyl group having a substituted or unsubstituted C1 to C30 alkyl group and C6 to C30 aryl group, or a triarylsilyl group having a substituted or unsubstituted C6 to C30 aryl group.
In an implementation, the dopant may be represented by Chemical Formula V.
In Chemical Formula V, R101 to R116 may each independently be, e.g., hydrogen, deuterium, a C1 to C10 alkyl group, substituted or unsubstituted C6 to C30 aryl group, or SiR132R133R134.
R132 to R134 may each independently be, e.g., a substituted or unsubstituted C1 to C6 alkyl group.
In an implementation, at least one of R101 to R116 may be a functional group represented by Chemical Formula V-1.
L100 may be, e.g., bidentate ligand of monovalent anion, or a ligand that coordinates to iridium through a lone pair of electrons on a carbon or heteroatom.
m16 and m17 may each independently be, e.g., an integer of 0 to 3, m16+m17 may be, e.g., an integer of 1 to 3.
In Chemical Formula V-1, R135 to R139 may each independently be, e.g., hydrogen, deuterium, a C1 to C10 alkyl group, substituted or unsubstituted C6 to C20 aryl group, or SiR132R133R134.
R132 to R134 may each independently be, e.g., a substituted or unsubstituted C1 to C6 alkyl group.
*indicates a linking point linked to carbon atom.
In an implementation, the dopant may be represented by Chemical Formula Z-1.
In Chemical Formula Z-1, rings A, B, C, and D may each independently be, e.g., 5- or 6-membered carbocyclic or heterocyclic rings.
RA, RB, Rc, and RD may independently indicate monosubstitution, disubstitution, tri substitution, or tetrasubstitution, or unsubstitution.
LB, Lc, and LD may each independently be, e.g., a direct bond, BR, NR, PR, 0, S, Se, C═O, S═O, SO2, CRR′, SiRR′, GeRR′, or a combination thereof.
In an implementation, when nA is 1, LE may be, e.g., a direct bond, BR, NR, PR, O, S, Se, C═O, S═O, SO2, CRR′, SiRR′, GeRR′, or a combination thereof; and when nA is 0, LE is not present;
RA, RB, RC, RD, R, and R′ may each independently be, e.g., hydrogen, deuterium, a halogen, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group, or a combination thereof. In an implementation, adjacent groups of RA, RB, RC, RD, R, and R′ may be arbitrarily linked with each other to form a ring; XB, XC, XD, and XE may each independently be, e.g., carbon or nitrogen; and Q1, Q2, Q3, and Q4 may each independently be, e.g., oxygen or a direct bond.
In an implementation, the composition for the organic optoelectronic device according to an embodiment may include a dopant represented by Chemical Formula VI.
In Chemical Formula VI, X100 may be, e.g., O, S, or NR131.
R101 to R131 may each independently be, e.g., hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, or —SiR132R133R134.
R132 to R134 may each independently be, e.g., C1 to C6 alkyl group.
In an implementation, at least one of R117 to R131 may be, e.g., —SiR132R133R134 or tert-butyl group.
The organic layer may further include a charge transport region in addition to the light emitting layer.
The charge transport region may be, e.g., the hole transport region 140.
The hole transport region 140 may help further increase hole injection and/or hole mobility between the anode 120 and the light emitting layer 130 and block electrons.
In an implementation, the hole transport region 140 may include a hole transport layer between the anode 120 and the light emitting layer 130 and a hole transport auxiliary layer between the light emitting layer 130 and the hole transport layer. In an implementation, a compound of Group B may be included in at least one of the hole transport layer and the hole transport auxiliary layer.
In the hole transport region, other suitable compounds may be used in addition to the compounds described herein.
In an implementation, the charge transport region may be, e.g., the electron transport region 150.
The electron transport region 150 may help further increase electron injection or electron mobility between the cathode 110 and the light emitting layer 130 and block holes.
In an implementation, the electron transport region 150 may include an electron transport layer between the cathode 110 and the light emitting layer 130, and an electron transport auxiliary layer between the light emitting layer 130 and the electron transport layer. In an implementation, a compound of Group C may be included in at least one of the electron transport layer and the electron transport auxiliary layer.
One embodiment may provide an organic light emitting diode including a light emitting layer as an organic layer.
Another embodiment may provide an organic light emitting diode including a light emitting layer and a hole transport region as an organic layer.
Another embodiment may provide an organic light emitting diode including a light emitting layer and an electron transport region as an organic layer.
The organic light emitting diode according to an embodiment may be an organic light emitting diode including, e.g., a hole transport region 140 and an electron transport region 150 in addition to the light emitting layer 130 as the organic layer 105, as shown in the FIGURE.
In an implementation, the organic light emitting diode may further include an electron injection layer, a hole injection layer, or the like, in addition to the light emitting layer as the aforementioned organic layer.
The organic light emitting diode 100 may be produced by forming an anode or a cathode on a substrate, forming an organic layer using a dry film formation method such as a vacuum deposition method (evaporation), sputtering, plasma plating, and ion plating, and forming a cathode or an anode thereon.
The organic light emitting diode may be applied to an organic light emitting display device.
Hereinafter, the embodiments are illustrated in more detail with reference to examples. However, these examples are exemplary, and the present scope is not limited thereto.
Hereinafter, starting materials and reactants used in examples and synthesis examples were purchased from Sigma-Aldrich Co. Ltd., TCI Inc., Tokyo chemical industry or P&H tech as far as there is no particular comment or were synthesized by known methods.
(Preparation of Compound for Organic Optoelectronic Device)
Compounds were synthesized through the following steps.
(Synthesis of First Compound)
1-bromo-4-chloro-2-fluorobenzene (61 g, 291 mmol), 2,6-dimethoxyphenylboronic acid (50.4 g, 277 mmol), K2CO3 (60.4 g, 437 mmol) and Pd(PPh3)4 (10.1 g, 8.7 mmol) were put in a round-bottomed flask and dissolved in THF (500 ml) and distilled water (200 ml) and then, stirred under reflux at 60° C. for 12 hours. When a reaction was completed, after removing an aqueous layer therefrom, column chromatography (hexane:dichloromethane (DCM) (20 vol %)) was used, obtaining 38 g (51%) of Int-1.
Int-1 (38 g, 142 mmol) and pyridine hydrochloride (165 g, 1425 mmol) were put in a round-bottomed flask and then, stirred under reflux at 200° C. for 24 hours. When a reaction was completed, the resultant was cooled to ambient temperature and slowly poured into distilled water and then, stirred for 1 hour. A solid therein was filtered, obtaining 23 g (68%) of Int-2.
Int-2 (23 g, 96 mmol) and K2CO3 (20 g, 144 mmol) were put in a round-bottomed flask and dissolved in N-methylpyrrolidone (NMP) (100 ml) and then, stirred under reflux at 180° C. for 12 hours. When a reaction was completed, the mixture was poured into an excess of distilled water. A solid therein was filtered and dissolved in ethyl acetate and then, dried with MgSO4, and an organic layer was removed therefrom under a reduced pressure. Subsequently, column chromatography (hexane: ethyl acetate (30 vol %)) was used, obtaining 16 g (76%) of Int-3.
Int-3 (16 g, 73 mmol) and pyridine (12 ml, 146 mmol) were put in a round-bottomed flask and dissolved in DCM (200 ml). After decreasing a temperature to 0° C., trifluoromethanesulfonic anhydride (14.7 ml, 88 mmol) was slowly added thereto in a dropwise fashion. After stirring the mixture for 6 hours, when a reaction was completed, an excess of distilled water was added thereto and then, stirred for 30 minutes and extracted with DCM. After removing an organic solvent under a reduced pressure, the residue was vacuum-dried, obtaining 22.5 g (88%) of Int-4.
Int-4 (22.5 g, 64 mmol), phenylboronic acid (7.8 g, 64 mmol), K2CO3 (13.3 g, 96 mmol), and Pd(PPh3)4 (3.7 g, 3.2 mmol) were used in the same manner as Synthesis Example 1, synthesizing 14.4 g (81%) of Int-5.
Int-5 (22.5 g, 80 mmol), bis(pinacolato)diboron (24.6 g, 97 mmol), Pd(dppf)Cl2 (2 g, 2.4 mmol), tricyclohexylphosphine (3.9 g, 16 mmol), and potassium acetate (16 g, 161 mmol) were put in a round-bottomed flask and dissolved in 320 ml of DMF. The mixture was stirred under reflux at 120° C. for 10 hours. When a reaction was completed, the mixture was poured into an excess of distilled water and then, stirred for 1 hour. A solid therein was filtered and dissolved in DCM. After removing moisture with MgSO4, an organic solvent was filtered with a silica gel pad and removed under a reduced pressure. The solid therefrom was recrystallized with ethyl acetate and hexane, obtaining 26.9 g (90%) of Int-6.
Mg (4.9 g, 202 mmol) was put in a round-bottomed flask under a nitrogen and heated with a heat gun. When moderately cooled down, iodine (0.5 g, 2 mmol) was added thereto, and THF (30 ml) was added thereto and then, stirred. Subsequently, 3-bromodibenzofuran (50 g, 202 mmol) dissolved in THF (100 ml) was put in a dropping funnel and then, slowly added dropwise to the round-bottomed flask. The mixed solution became transparent, generating heat and thus was stirred, until completely transparent. In a new round-bottomed flask, cyanuric chloride (37.3 g, 202 mmol) was dissolved in THF (200 ml) and then, placed under an ice bath condition. Subsequently, a Grignard reagent, which had already been prepared, was slowly added thereto in a dropwise fashion. The obtained mixture was additionally stirred for 1 hour or so, and distilled water was added thereto, completing a reaction. An organic layer was separated therefrom, and the solvent was removed therefrom under a reduced pressure. After adding a small amount of DCM thereto to dissolve a product therefrom and then, adding the solution dropwise to methanol to precipitate a solid, the solid was filtered, obtaining 38 g (60%) of Int-7.
Int-7 (19 g, 60 mmol), 4-biphenylboronic acid (11.9 g, 60 mmol), K2CO3 (12.5 g, 90 mmol), and Pd(PPh3)4 (3.5 g, 3 mmol) were used under a nitrogen condition in a round-bottomed flask in the same manner as Synthesis Example 1, synthesizing 15.1 g (58%) of Int-8.
Int-7 (19 g, 60 mmol), 3-biphenylboronic acid (11.9 g, 60 mmol), K2CO3 (12.5 g, 90 mmol), and Pd(PPh3)4 (3.5 g, 3 mmol) were used under a nitrogen condition in a round-bottomed flask in the same manner as Synthesis Example 1, synthesizing 15.9 g (61%) of Int-9.
Int-8 (15 g, 35 mmol), Int-6 (12.8 g, 35 mmol), K2CO3 (7.2 g, 52 mmol) and Pd(PPh3)4 (2 g, 1.7 mmol) were used under a nitrogen condition in a round-bottomed flask in the same manner as Synthesis Example 1, synthesizing 15.5 g (70%) of Compound 12. LC/MS calculated for: C45H27N3O2 Exact Mass: 641.21 found for: 642.64
Int-9 (15.9 g, 37 mmol), Int-6 (15 g, 40 mmol), K2CO3 (7.6 g, 55 mmol) and Pd(PPh3)4 (2.1 g, 1.8 mmol)) were used under a nitrogen condition in a round-bottomed flask in the same manner as Synthesis Example 1, synthesizing 18.8 g (80%) of Compound 16. LC/MS calculated for: C45H27N3O2 Exact Mass: 641.21 found for: 642.16
1-chloro-3,5-dimethoxybenzene (70 g, 406 mmol) and pyridine hydrochloride (468 g, 4,055 mmol) were put in a round-bottomed flask and stirred under reflux at 200° C. for 24 hours. When a reaction was completed, the resultant was cooled to ambient temperature and slowly poured into distilled water for 1 hour and then, stirred. A solid therein were filtered, obtaining 51.6 g (88%) of Int-10.
Int-10 (51.6 g, 357 mmol) and p-toluene sulfonic acid monohydrate (6.8 g, 36 mmol) were put in a round-bottomed flask and dissolved in 500 ml of methanol. Subsequently, a solution prepared by dissolving N-bromosuccinimide (NBS) (63.5 g, 357 mmol) in methanol (1 L) was slowly added thereto in a dropwise fashion at 0° C. for 30 minutes. After stirring the mixture for 1 hour at ambient temperature, when a reaction was completed, a sodium thiosulfate saturated solution was poured thereinto and then, stirred. Subsequently, DCM was added thereto for extraction, and the solvent was removed therefrom under a reduced pressure. A product therein was separated through flash column chromatography, obtaining 72 g (90%) of Int-11.
In a round-bottomed flask under a nitrogen atmosphere, 2-fluorophenylboronic acid (45 g, 322 mmol), Int-11 (72 g, 322 mmol), K2CO3 (97.8 g, 708 mmol), and Pd(PPh3)4 (11.2 g, 9.7 mmol) were used in the same manner as Synthesis Example 1, synthesizing 34.5 g (45%) of Int-12.
26.9 g (85%) of Int-13 was synthesized in the same manner as Synthesis Example 3 by and dissolving Int-12 (34.5 g, 145 mmol) and K2CO3 (26 g, 188 mmol) in 450 ml of NMP in a round-bottomed flask.
Int-13 (26.9 g, 123 mmol) and pyridine (20 ml, 246 mmol) were put in a round-bottomed flask and dissolved in DCM (300 ml). After decreasing a temperature to 0° C., trifluoromethane sulfonic anhydride (24.7 ml, 148 mmol) were slowly added thereto in a dropwise fashion. The obtained mixture was stirred for 6 hours, and when a reaction was completed, an excess of distilled water was added thereto and then, stirred for 30 minutes and extracted with DCM. After removing an organic solvent therefrom under a reduced pressure, the residue was vacuum-dried, obtaining 36.2 g (84%) of Int-14.
Int-14 (36.2 g, 103 mmol), phenylboronic acid (12.6 g, 103 mmol), K2CO3 (21.4 g, 155 mmol), and Pd(PPh3)4 (5.9 g, 5 mmol) were used in the same manner as Synthesis Example 1, obtaining 25.9 g (90%) of Int-15
25.8 g (75%) of Int-16 was synthesized in the same manner as Synthesis Example 6 by dissolving Int-15 (25.9 g, 93 mmol), bis(pinacolato)diboron (28.3 g, 112 mmol), Pd(dppf)Cl2(2.3 g, 2.8 mmol), tricyclohexylphosphine (4.5 g, 18.6 mmol), and potassium acetate (18.2 g, 186 mmol) in DMF (350 ml) in a round-bottomed flask.
20.2 g (77%) of Compound 9 was synthesized in the same manner as Synthesis Example 1 by using Int-8 (12 g, 28 mmol), Int-16 (11 g, 30 mmol), K2CO3 (5.7 g, 41 mmol), and Pd(PPh3)4 (1.6 g, 1.4 mmol) in a round-bottomed flask under a nitrogen atmosphere. LC/MS calculated for: C45H27N3O2 Exact Mass: 641.21 found for: 642.31
After sequentially synthesizing Int-29, Int-30, and Int-31 in the same manner as Synthesis Examples 1 to 4 by using 1-bromo-2-fluorobenzene (42 g, 240 mmol) instead of 1-bromo-4-chloro-2-fluorobenzene, 27.4 g (38%) of Int-32 was obtained.
In a round-bottomed flask under a nitrogen atmosphere, Int-32 (27.4 g, 86.6 mmol), bis(pinacolato)diboron (26.4 g, 104 mmol), Pd(dppf)Cl2 (2.2 g, 2.6 mmol), and potassium acetate (12.8 g, 130 mmol) were dissolved in toluene (350 ml) and then, stirred under reflux at 120° C. for 15 hours. When a reaction was completed, after removing a solid therefrom using Celite, 1 L of hot toluene was poured thereinto. Subsequently, a filtrate therefrom was removed under a reduced pressure, ethyl acetate was used for recrystallization, obtaining 11.5 g (45%) of Int-33.
24.5 g (63%) of Int-34 was obtained in the same manner as Synthesis Example 7 by using 4-bromobiphenyl (30 g, 128.7 mmol) instead of 3-bromodibenzofuran.
Int-34 (16.5 g, 54.6 mmol), Int-6 (20.2 g, 54.6 mmol), K2CO3 (11.3 g, 81.9 mmol), and Pd(PPh3)4 (3.2 g, 2.7 mmol) were put in a round bottomed flask and dissolved in distilled water (50 ml) and THF (150 ml) and then, stirred under reflux at 60° C. for 12 hours. When a reaction was completed, an excess of methanol was poured thereinto and then, stirred for 30 minutes at ambient temperature. Then, a solid was filtered therefrom and recrystallized in dichlorobenzene, obtaining 20.9 g (75%) of Int-35.
Int-35 (19.9 g, 39 mmol), Int-33 (11.5 g, 39 mmol), K2CO3 (8.1 g, 58.5 mmol), and Pd(PPh3)4 (2.25 g, 1.95 mmol) were put in a round-bottomed flask and dissolved in distilled water (50 ml) and THF (150 ml) and then, stirred under reflux at 60° C. for 12 hours. When a reaction was completed, the mixture was poured into an excess of methanol and then, stirred at ambient temperature for 30 minutes. A solid therein was filtered and recrystallized in dichlorobenzene, obtaining 13 g (52%) of Compound 33. LC/MS calculated for: C45H27N3O2 Exact Mass: 641.21 found for: 642.30
2,4-bis(4-biphenylyl)-6-chloro-1,3,5-triazine (11 g, 36.4 mmol), 344,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-dibenzofuran (23.6 g, 80.1 mmol), K2CO3 (11.1 g, 80.1 mmol), and Pd(PPh3)4 (2.1 g, 1.8 mmol) were put in a round-bottomed flask under a nitrogen atmosphere, and dissolved in distilled water (60 ml) and THF (190 ml) and then, stirred under reflux at 60° C. for 12 hours. When a reaction was completed, the mixture was poured into an excess of methanol and then, stirred at ambient temperature for 30 minutes. A solid therein was filtered and vacuum-dried. The solid was recrystallized in monochlorobenzene, obtaining 14.4 g (70%) of Compound Y.
LC/MS calculated for: C39H23N3O2 Exact Mass: 565.18 found for: 566.01
(Synthesis of Second Compound)
9-phenyl-3,3′-bi-9H-carbazole (20 g, 49.0 mmol), 2-bromo-9-phenylcarbazole (15.8 g, 49.0 mmol), NaOtBu (7.1 g, 73.5 mmol), Pd2(dba)3 (2.2 g, 2.5 mmol), and P(t-Bu)3 (1.5 g, 7.4 mmol) were put in a round-bottomed flask under a nitrogen atmosphere and dissolved in xylene (245 ml) and then, stirred under reflux at 120° C. for 12 hours. When a reaction was completed, an excess of distilled water was poured thereinto and then, stirred for 1 hour. A solid therein was filtered and dissolved in toluene at a high temperature. After removing moisture with MgSO4 and filtering an organic solvent with silica gel pad, a filtrate therefrom was stirred. Subsequently, a solid generated therein was filtered and vacuum-dried, obtaining 21.6 g (68%) of Compound B-2.
Compound B-3 (22.6 g, 71%) was obtained in the same manner as Synthesis Example 24 except that 3-bromo-9-phenylcarbazole was used instead of the 2-bromo-9-phenylcarbazole.
Comparative Synthesis Example 2: Synthesis of Compound D-1
Compound D-1 was synthesized in the same manner as Synthesis Example 25 by using 1 equivalent of a synthesis intermediate of 5,7-dihydro-indolo[2,3-b]carbazole (cas: 111296-90-3) and 2.5 equivalent of 4-bromo-1,1′-biphenyl (cas:92-66-0).
LC/MS calculated for: C42H28N2 Exact Mass: 560.2252 found for: 561.24
Comparative Synthesis Example 3: Synthesis of Compound D-2
Compound D-2 was synthesized by a suitable method.
(Manufacture of Organic Light Emitting Diode)
A glass substrate coated with ITO (indium tin oxide) was washed with distilled water and ultrasonic waves. After washing with the distilled water, the glass substrate was ultrasonically washed with isopropyl alcohol, acetone, or methanol, and dried and then, moved to a plasma cleaner, cleaned by using oxygen plasma for 10 minutes, and moved to a vacuum depositor. This prepared ITO transparent electrode was used as an anode, and Compound A doped with 3% NDP-9 (Novaled GmbH) was vacuum-deposited on the ITO substrate to form a 100 Å-thick hole injection layer, and Compound A was deposited to be 1,350 Å thick on the hole injection layer to form a hole transport layer. Compound B was deposited to be 350 Å thick on the hole transport layer to form a hole transport auxiliary layer. On the hole transport auxiliary layer, Compound 12 and Compound B-3 were simultaneously used as a host and doped with 10 wt % of PhGD as a dopant and then, vacuum-deposited to form a 400 Å-thick light emitting layer. In Example 1, Compound 12 and Compound B-3 were used in a weight ratio of 2:8. Subsequently, Compound C was deposited to form a 50 Å-thick electron transport auxiliary layer on the light emitting layer, and Compound D and LiQ were simultaneously vacuum-deposited in a weight ratio of 1:1 to form a 300 Å-thick electron transport layer. On the electron transport layer, LiQ and Al were sequentially vacuum-deposited to be 15 Å-thick and 1,200 Å-thick, manufacturing an organic light emitting diode.
The structure was ITO/Compound A (3% NDP-9 doping, 100 Å)/Compound A (1,350 Å)/Compound B (350 Å)/EML [90 wt % of host (Compound 12: Compound B-3=2:8 w/w): PhGD=90 wt %: 10 wt % (400 Å)/Compound C (50 Å)/Compound D: LiQ (300 Å)/LiQ (15 Å)/Al (1,200 Å).
Compound A: N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine
Compound B: N,N-bis(9,9-dimethyl-9H-fluoren-4-yl)-9,9-spirobi(fluorene)-2-amine
Compound C: 243′-(9,9-Dimethyl-9H-fluorenc-2-yl)[1,1′-biphenyl]-3-yl]-4,6-diphenyl-1,3,5-triazine
Compound D: 2-[4-[4-(4′-Cyano-1,1′-biphenyl-4-yl)-1-naphthyl]phenyl]-4,6-diphenyl-1,3,5-triazine
[PhGD]
Examples 2 to 4 and Comparative Examples 1 to 3
Diodes of Examples 2 to 4, and Comparative Examples 1 to 3 were manufactured in the same manner as in Example 1, except that the host compositions were changed as described in Tables 1 to 3.
Evaluation
The characteristics of the organic light emitting diodes according to Examples 1 to 4 and Comparative Examples 1 to 3 were evaluated, and the results are shown in Tables 1 to 3. Specific measurement methods are as follows.
(1) Measurement of Current Density Change Depending on Voltage Change
The obtained organic light emitting diodes were measured regarding a current value flowing in the unit device, while increasing the voltage from 0 V to 10 V using a current-voltage meter (Keithley 2400), and the measured current value was divided by area to provide the results.
(2) Measurement of Luminance Change Depending on Voltage Change
Luminance was measured by using a luminance meter (Minolta Cs-1000A), while the voltage of the organic light emitting diodes was increased from 0 V to 10 V.
(3) Measurement of Current Efficiency
Current efficiency (cd/A) at the same current density (10 mA/cm2) were calculated by using the luminance and current density from the items (1) and (2).
(4) Measurement of Life-span
The luminance (cd/m2) was maintained at 6,000 cd/m2, and the time at which the current efficiency (cd/A) decreased to 90% was measured to obtain results.
(5) Measurement of Driving Voltage
A driving voltage of each diode was measured by using a current-voltage meter (Keithley 2400) at 15 mA/cm2.
(6) Calculation of Driving Voltage Ratio (%)
The relative comparison values with the measured driving voltage value of Comparative Example 1 are shown in Table 1.
The relative comparison values with the measured driving voltage value of Comparative Example 3 are shown in Table 3.
(7) Calculation of Current Efficiency Ratio (%)
The relative comparison values with the measured luminous efficiency value of Comparative Example 2 are shown in Table 2.
(8) Calculation of Life-span Ratio (%)
The relative comparison values with the measured T90(h) life-span value of Comparative Example 1 are shown in Table 1.
The relative comparison values with the measured T90(h) life-span value of Comparative Example 2 are shown in Table 2.
The relative comparison values with the measured T90(h) life-span value of Comparative Example 3 are shown in Table 3.
Referring to Tables 1 to 3, the compositions according to the Examples exhibited greatly improved driving voltage, efficiency, or life-span compared with the composition according to the Comparative Examples.
In general, the lower driving voltage and the higher efficiency and life-span mean excellent performance, and referring Tables 1 and 3, the compositions according to the Examples exhibited a relatively lower driving voltage ratio and a relatively higher current efficiency ratio or T90 life-span ratio than the Comparative Examples and thus improved device performance.
One or more embodiments may provide a composition for an organic optoelectronic device capable of implementing an organic optoelectronic device having high efficiency and a long life-span.
An organic optoelectronic device having high efficiency and a long life-span may be realized.
Example embodiments have been disclosed herein, and although specific 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 to one of ordinary skill in the art as of the filing of the present application, features, characteristics, and/or elements described in connection with a particular 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 skill in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention as set forth in the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0064311 | May 2021 | KR | national |
| 10-2022-0059688 | May 2022 | KR | national |
