# US 12,225,819 B2 · Organic electronic device

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- Number: US 12,225,819 B2
- Document ID: US12225819B2
- Status: Granted
- Kind: B2
- Application number: 17/631,592
- Filed: 2020-07-30
- Published: 2022-11-24
- Granted: 2025-02-11
- Earliest claimed: 2019-08-02
- Assignees: Duk San Neolux Co., Ltd.
- Applicants: Duk San Neolux Co., Ltd.
- Inventors: Soung Yun Mun; Min Ji Jo; Chi Hyun Park; Yong Wook Park; Sun Hee Lee; Jung Geun Lee
- Web page: https://patentgrep.com/patent/US12225819B2

## CPC

- C09B 57/008: {Triarylamine dyes containing no other chromophores}
- H10K 85/6574: {comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes}
- H10K 85/631: {Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine}
- H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/636: {comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/6576: {comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene}
- H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light
- H10K 50/15: Hole transporting layers
- H10K 50/155: comprising dopants
- H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths
- Y02E 10/549: Organic PV cells
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Embodiments of the present invention relate to an organic electronic device capable of ensuring high luminous efficiency, low driving voltage and high heat resistance, and improving color purity or lifespan.

## Claims

### Claim 1

An organic electronic device comprising:
a first electrode;
a second electrode; and
an organic material layer positioned between the first electrode and the second electrode and comprising a first stack, a second stack, and a third stack,
wherein the first stack comprises a first hole transport region, a first emission layer, and a first electron transport region,
the first hole transport region comprises a first hole transport layer and a first auxiliary emission layer,
the first hole transport layer or the first auxiliary emission layer comprises a first compound represented by the following Formula 1,
the thickness of the first hole transport layer ranges from 250 Å to 700 Å, and
10% to 50% of the thickness of the first hole transport layer is doped with a first doping material,
wherein each of m and n is independently 0 or 1, where m+n is 1,
each of Ar1 and Ar2 is selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
each of Ar3 and Ar4 is independently selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
each of L1 to L6 is independently selected from the group consisting of a single bond; a C6-C60 arylene group; a fluorenylene group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
X is selected from the group consisting of hydrogen; deuterium; a C6-C30 aryl group; a fluorenyl group; a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C30 alkyl group; a C2-C20 alkenyl group; or a C2-C20 alkynyl group,
i) when n is 0, Y is selected from the group consisting of hydrogen; deuterium; a C6-C30 aryl group; a fluorenyl group; a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C30 alkyl group; a C2-C20 alkenyl group; or a C2-C20 alkynyl group, and ii) when n is 1, Y is selected from the group consisting of a C6-C60 arylene group; a fluorenylene group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
X and Y are bonded to form a spiro compound,
each of ring A and ring B is independently a C6-C10 aryl group,
each of R1 and R2 is independently selected from the group consisting of deuterium; a halogen; a C6-C30 aryl group; a fluorenyl group; a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C30 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group,
a is an integer from 0 to 7, and b is an integer from 0 to 8,
each of the aryl group, the fluorenyl group, the heterocyclic group, the fused ring group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxy group, the arylene group, and the fluorenylene group is further substituted with one or more substituents selected from the group consisting of deuterium; a halogen group; a C1-C20 alkoxyl group; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C6-C25 aryl group; a C6-C25 aryl group substituted with deuterium; a fluorenyl group; a C2-C20 heterocyclic group; or a C3-C20 cycloalkyl group, and
each of the further substituted substituents is capable of being further substituted with one or more substituents selected from the group consisting of deuterium; a halogen group; a C1-C20 alkoxyl group; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C6-C25 aryl group; a C6-C25 aryl group substituted with deuterium; a fluorenyl group; a C2-C20 heterocyclic group; or a C3-C20 cycloalkyl group, and the substituents are bonded to each other to form a ring.

### Claim 2 (depends on 1)

The device of claim 1, wherein each of the first hole transport layer and the first auxiliary emission layer of the first stack comprises the first compound represented by Formula 1.

### Claim 3 (depends on 1)

The device of claim 1, wherein the first compound is represented by any one of the following Formula 2 to Formula 5:
wherein each of c and d is independently an integer from 0 to 4, and e is an integer from 0 to 5,
i) each of R3, R4, and R6 is independently selected from the group consisting of deuterium; a halogen; a C6-C30 aryl group; a fluorenyl group; a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C30 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group, and ii) a plurality of R3s, a plurality of R4s, and a plurality of R6s are bonded to each other to form rings, respectively,
R5 is selected from the group consisting of hydrogen; deuterium; a halogen; a C6-C30 aryl group; a fluorenyl group; a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C30 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group,
Ar1 to Ar4, L1 to L6, R1, R2, a, and b are the same as those defined in claim 1.

### Claim 4 (depends on 1)

The device of claim 1, wherein the first compound is represented by one of the following Formulas 6 to 9:
wherein Z is O, S, NR′, or CR′R″,
R′ and R″ are respectively and independently selected from the group consisting of a C1-C30 alkyl group; a C6-C30 aryl group; or a C3-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P, or bonded to each other to form spiro compounds,
i) each of R7 and R8 is independently selected from the group consisting of deuterium; a halogen; a C6-C30 aryl group; a fluorenyl group; a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C30 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group, and ii) a plurality of R7s and a plurality of R8s are bonded to each other to form rings, respectively,
f is an integer from 0 to 4, and g is an integer from 0 to 3, and
Ar2, L1 to L3, ring A, ring B, X, Y, R1, R2, a, and b are the same as those defined in claim 1.

### Claim 5 (depends on 1)

The device of claim 1, wherein the first compound is represented by one of the following Formulas 10 to 12,
wherein R9 i) is independently selected from the group consisting of deuterium; a halogen; a C6-C30 aryl group; a fluorenyl group; a C2-C30 heterocyclic group including at least one heteroatom of O, N, S, Si, or P; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C30 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group, and ii) a plurality of Ros are bonded to each other to form a ring, and
Ar1, Ar3, L1, L4, ring A, ring B, X, Y, R1, R2, a, and b are the same as those defined in claim 1.

### Claim 6 (depends on 1)

The device of claim 1, wherein the first compound comprises one or more of the following compounds:

### Claim 7 (depends on 1)

The device of claim 1, wherein the first doping material is represented by the following Formula E:
wherein, in Formula E, each of Rp1 to Rp6 is independently selected from the group consisting of hydrogen; a halogen group; a nitrile group; a nitro group; —SO2R; —SOR; —SO2NR2; —SO3R; a trifluoromethyl group; —COOR; —CONHR; —CONRR′; a C1-C30 alkoxyl group; a C1-C30 alkyl group; a C2-C20 alkenyl group; a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fluorenyl group; a C6-C30 aryl group; a fused ring group of a C3-C30 aliphatic 10 ring and a C6-C30 aromatic ring; or —NRR′,
R and R′ are respectively selected from the group consisting of a C1-C30 alkyl group; a fluorenyl group; a C6-C30 aryl group; a fused ring group of a C3-C30 aliphatic ring and a C6-C30 aromatic ring; or a C2-C30 heterocyclic group including at least one hetero atom of O, N, S, Si, or P, and
in Formula E, each of the aryl group, the fluorenyl group, the heterocyclic group, the fused ring group, the alkyl group, the alkenyl group, the alkynyl group, and the alkoxyl group is substituted with one or more substituents selected from the group consisting of deuterium; a halogen group; a C1-C20 alkoxyl group; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C6-C25 aryl group; a C6-C25 aryl group substituted with deuterium; a fluorenyl group; a C2-C20 heterocyclic group; or a C3-C20 cycloalkyl group.

### Claim 8 (depends on 1)

The device of claim 1, wherein the first hole transport layer comprises a first doping material-doped layer doped with the first doping material and a first doping material undoped layer not doped with the first doping material, and
the first doping material-doped layer comprises the first compound and 5 to 15 parts by weight of the first doping material with respect to 100 parts by weight of the first compound.

### Claim 9 (depends on 1)

The device of claim 1, wherein the second stack comprises a second hole transport region, a second emission layer, and a second electron transport region,
the second hole transport region comprises a second hole transport layer and a second auxiliary emission layer,
the second hole transport layer or the second auxiliary emission layer comprises a second compound represented by Formula 1,
the thickness of the second hole transport layer ranges from 250 Å to 700 Å,
10% to 50% of the thickness of the second hole transport layer is doped with a second doping material,
the third stack comprises a third hole transport region, a third emission layer, and a third electron transport region,
the third hole transport region comprises a third hole transport layer and a third auxiliary emission layer,
the third hole transport layer or the third auxiliary emission layer comprises a third compound represented by Formula 1,
the thickness of the third hole transport layer ranges from 250 Å to 700 Å, and
10% to 50% of the thickness of the third hole transport layer is doped with a third doping material.

### Claim 10 (depends on 9)

The device of claim 9, wherein the first compound, the second compound, and the third compound are the same compounds.

### Claim 11 (depends on 1)

The device of claim 1, wherein the first hole transport layer or the first auxiliary emission layer comprises at least one of the first compound or the fourth compound,
the fourth compound comprises a radical of a compound represented by the following Formula A or Formula B and is represented by at least one of the following Formula C or Formula D,
the thickness of the second hole transport layer ranges from 250 Å to 700 Å,
10% to 50% of the thickness of the second hole transport layer is doped with a second doping material,
wherein, in Formula A,
1) Each of a and b is independently an integer from 0 to 4,
2) X is O, S, CR′R″, or N-L1-Ar1,
3) R1 and R2 are respectively and independently selected from the group consisting of deuterium; tritium; a halogen; a cyano group; a nitro group; a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring; a C1-C50 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group, and the plurality of R1s and the plurality of R2s are bonded to form rings, respectively,
4) R′ and R″ are respectively and independently selected from the group consisting of hydrogen; deuterium; a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring, and the R′ and R″ are bonded to each other to form a ring,
5) L1 is selected from the group consisting of a single bond; a C6-C60 arylene group; a fluorenylene group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring, and
6) Ar1 is selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
in Formula B,
1) l is an integer from 0 to 5, m is an integer from 0 to 4, each of y and z is an integer from 0 to 4, where y+z is not 0,
2) Ra and Rb are respectively and independently selected from the group consisting of deuterium; tritium; a halogen; a cyano group; a nitro group; a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring; a C1-C50 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group, and the plurality of Ras and the plurality of Rbs are bonded to form rings, respectively,
in Formula C,
1) N is 1 or 2,
2) Ar2 is a radical of a compound represented by Formula A or a radical of a compound represented by Formula B,
3) Each of Ar3 and Ar4 is independently selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
4) Each of L2 to L4 is independently selected from the group consisting of a single bond; a C6-C60 arylene group; a fluorenylene group; or a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P, and
in Formula D,
1) o is an integer from 1 to 4,
2) Each of Ar5 to Ar8 is independently selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
3) Each of L5 to L9 is independently selected from the group consisting of a single bond; a C6-C60 arylene group; a fluorenylene group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring, wherein L9 is a radical of a compound represented by Formula A or a radical of a compound represented by Formula B, and
in Formulas A to D,
each of the aryl group, the fluorenyl group, the heterocyclic group, the fused ring group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxy group, the arylene group, and the fluorenylene group is further substituted with one or more substituents selected from the group consisting of deuterium; a nitro group; a nitrile group; a halogen group; an amino group; a C1-C20 alkylthio group; a C1-C20 alkoxyl group; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C6-C25 aryl group; C6-C25 aryl group substituted with deuterium; a fluorenyl group; a C2-C20 heterocyclic group; a C3-C20 cycloalkyl group; a C7-C20 arylalkyl group; or a C8-C20 arylalkenyl group, wherein the further substituted substituents are bonded to form a ring, and
each of the further substituted substituents is further substituted with one or more substituents selected from the group consisting of deuterium; a nitro group; a nitrile group; a halogen group; an amino group; a C1-C20 alkylthio group; a C1-C20 alkoxyl group; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C6-C25 aryl group; a C6-C25 aryl group substituted with deuterium; a fluorenyl group; a C2-C20 heterocyclic group; a C3-C20 cycloalkyl group; a C7-C20 arylalkyl group; or a C8-C20 arylalkenyl group, wherein the substituents are bonded to form a ring.

### Claim 12 (depends on 9)

The device of claim 9, wherein the first hole transport layer comprises a first doping material-doped layer doped with the first doping material and a first doping material undoped layer not doped with the first doping material,
the first doping material-doped layer comprises the first compound and 5 to 15 parts by weight of the first doping material with respect to 100 parts by weight of the first compound,
the second hole transport layer comprises a second doping material-doped layer doped with the second doping material and a second doping material undoped layer not doped with the second doping material,
the second doping material-doped layer comprises the second compound and 5 to 15 parts by weight of the second doping material with respect to 100 parts by weight of the second compound,
the third hole transport layer comprises a third doping material-doped layer doped with a third doping material and a third doping material undoped layer not doped with the third doping material, and
the third doping material-doped layer comprises the third compound and 5 to 15 parts by weight of the third doping material with respect to 100 parts by weight of the third compound.

### Claim 13 (depends on 10)

The device of claim 10, wherein the first hole transport layer comprises a first doping material-doped layer doped with the first doping material and a first doping material undoped layer not doped with the first doping material, and
the first doping material-doped layer comprises at least one of the first compound or the fourth compound, and comprises 5 to 15 parts by weight of the first doping material with respect to 100 parts by weight of a total amount of the first compound and the fourth compound.

### Claim 14 (depends on 1)

The device of claim 1, wherein the organic material layer further comprises a fourth stack,
wherein the fourth stack comprises a fourth hole transport region, a fourth emission layer, and a fourth electron transport region,
the fourth hole transport region comprises a fourth hole transport layer and a fourth auxiliary emission layer, the fourth hole transport layer or the fourth auxiliary emission layer comprises at least one of a fifth compound or a sixth compound,
the fifth compound is represented by Formula 1,
the sixth compound comprises a radical of a compound represented by the following Formula A or Formula B and is represented by the following Formula C or Formula D,
the thickness of the fourth hole transport layer ranges from 250 Å to 700 Å,
10% to 50% of the thickness of the fourth hole transport layer is doped with a fourth doping material,
wherein, in Formula A,
1) each of a and b is independently an integer from 0 to 4,
2) X is O, S, CR′R″, or N-L1-Ar1,
3) R1 and R2 are respectively and independently selected from the group consisting of deuterium; tritium; a halogen; a cyano group; a nitro group; a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring; a C1-C50 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group, and the plurality of R1s and the plurality of R2s are bonded to form rings, respectively,
4) R′ and R″ are respectively and independently selected from the group consisting of hydrogen; deuterium; a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring, and the R′ and R″ are bonded to each other to form a ring,
5) L1 is selected from the group consisting of a single bond; a C6-C60 arylene group; a fluorenylene group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring, and
6) Ar1 is selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
in Formula B,
1) l is an integer from 0 to 5, m is an integer from 0 to 4, each of y and z is an integer from 0 to 4, where y+z is not 0,
2) Ra and Rb are respectively and independently selected from the group consisting of deuterium; tritium; a halogen; a cyano group; a nitro group; a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring; a C1-C50 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C30 alkoxyl group; or a C6-C30 aryloxy group, and the plurality of Ras and the plurality of Ris are bonded to form rings, respectively,
in Formula C,
1) N is 1 or 2,
2) Ar2 is a radical of a compound represented by Formula A or a radical of a compound represented by Formula B,
3) Each of Ar3 and Ar4 is independently selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
4) Each of L2 to L4 is independently selected from the group consisting of a single bond; a C6-C60 arylene group; a fluorenylene group; or a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P, and
in Formula D,
1) o is an integer from 1 to 4,
2) Each of Ar5 to Ar8 is independently selected from the group consisting of a C6-C60 aryl group; a fluorenyl group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring,
3) Each of L5 to L9 is independently selected from the group consisting of a single bond; a C6-C60 arylene group; a fluorenylene group; a C2-C60 heterocyclic group including at least one hetero atom of O, N, S, Si, or P; or a fused ring group of a C3-C60 aliphatic ring and a C6-C60 aromatic ring, wherein L9 is a radical of a compound represented by Formula A or a radical of a compound represented by Formula B, and
in Formulas A to D,
each of the aryl group, the fluorenyl group, the heterocyclic group, the fused ring group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxy group, the arylene group, and the fluorenylene group is further substituted with one or more substituents selected from the group consisting of deuterium; a nitro group; a nitrile group; a halogen group; an amino group; a C1-C20 alkylthio group; a C1-C20 alkoxyl group; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C6-C25 aryl group; C6-C25 aryl group substituted with deuterium; a fluorenyl group; a C2-C20 heterocyclic group; a C3-C20 cycloalkyl group; a C7-C20 arylalkyl group; or a C8-C20 arylalkenyl group, wherein the further substituted substituents are bonded to form a ring, and
each of the further substituted substituents is further substituted with one or more substituents selected from the group consisting of deuterium; a nitro group; a nitrile group; a halogen group; an amino group; a C1-C20 alkylthio group; a C1-C20 alkoxyl group; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C6-C25 aryl group; a C6-C25 aryl group substituted with deuterium; a fluorenyl group; a C2-C20 heterocyclic group; a C3-C20 cycloalkyl group; a C7-C20 arylalkyl group; or a C8-C20 arylalkenyl group, wherein the substituents are bonded to form a ring.

### Claim 15 (depends on 1)

The device of claim 1, wherein at least one of the first emission layer, the second emission layer, or the third emission layer is a blue light emission layer.

### Claim 16 (depends on 1)

The device of claim 1, wherein each of the first emission layer, the second emission layer, and the third emission layer is a blue light emission layer.

### Claim 17 (depends on 1)

The device of claim 1, wherein one or two of the first emission layer, the second emission layer, and the third emission layer are blue light emission layers, and one or two of the first emission layer, the second emission layer, and the third emission layer may be green light emission layers.

### Claim 18 (depends on 1)

The device of claim 1, wherein two emission layers of the first emission layer, the second emission layer, and the third emission layer are blue light emission layers, and the remaining one emission layer of the first emission layer, the second emission layer, and the third emission layer is a green light emission layer.

### Claim 19 (depends on 18)

The device of claim 18, wherein the green light emission layer is positioned between the two blue light emission layers.

### Claim 20 (depends on 1)

The device of claim 1, wherein at least one of the first emission layer, the second emission layer, or the third emission layer is a multi-emission layer emitting green light and blue light.

### Claim 21 (depends on 14)

The device of claim 14, wherein two light emission layers of the first to fourth emission layers are blue light emission layers, and the remaining one emission layer different from the blue light emission layers is a green light emission layer.

### Claim 22 (depends on 14)

The device of claim 14, wherein the fourth hole transport layer comprises the fifth compound.