# US 10,374,183 B2 · Organic light emitting display device having layer to control charge transfer

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- Number: US 10,374,183 B2
- Document ID: US10374183B2
- Status: Granted
- Kind: B2
- Application number: 15/244,871
- Filed: 2016-08-23
- Published: 2017-05-25
- Granted: 2019-08-06
- Earliest claimed: 2015-11-19
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: EunJung Park
- Web page: https://patentgrep.com/patent/US10374183B2

## CPC

- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/131: {with spacer layers between the electroluminescent layers}
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 50/167: {between the light-emitting layer and the anode}
- H10K 50/19: Tandem OLEDs
- H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths
- H10K 85/30: Coordination compounds
- H10K 85/324: {comprising aluminium, e.g. Alq3}
- H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene}
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
- H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Discussed is an organic light emitting display device. The organic light emitting display device may include an anode on a substrate, a first emission part that is disposed on the anode and includes a first emission layer and a first electron transfer layer, a second emission part that is disposed on the first emission part and includes a second emission layer and a second electron transfer layer, and a cathode on the second emission part. At least one among the first electron transfer layer and the second electron transfer layer may include a first material and a second material, and an absolute value of a LUMO energy level of the first material may be larger than an absolute value of a LUMO energy level of the second material.

## Claims

### Claim 1

An organic light emitting display device, comprising:
an anode on a substrate;
a first emission part on the anode, the first emission part including a first emission layer and a first electron transfer layer;
a second emission part on the first emission part, the second emission part including a second emission layer and a second electron transfer layer;
an N-type charge generation layer between the first emission part and the second emission part; and
a cathode on the second emission part,
wherein at least one among the first electron transfer layer and the second electron transfer layer comprises a first material and a second material, and an absolute value of a lowest unoccupied molecular orbital (LUMO) energy level of the first material is larger than an absolute value of a LUMO energy level of the second material,
wherein the first material has an absolute value of the LUMO energy level within a first range of 2.91 eV to 3.40 eV and the second material has an absolute value of the LUMO energy level within a second range of 2.60 eV to 2.90 eV,
wherein the first range and the second range do not overlap,
wherein the first electron transfer layer comprises one among the first material and the second material, and the second electron transfer layer comprises the first material and the second material, and
wherein a difference between a LUMO energy level of the first electron transfer layer and a LUMO energy level of the N-type charge generation layer is 0.50 eV to 1.00 eV.

### Claim 2 (depends on 1)

The organic light emitting display device of claim 1, wherein an amount of the second material is higher than an amount of the first material.

### Claim 3 (depends on 1)

The organic light emitting display device of claim 1, wherein in the first electron transfer layer or the second electron transfer layer, a content of the second material is more than 50 wt %.

### Claim 4 (depends on 1)

The organic light emitting display device of claim 1, wherein the first material and the second material are mixed through co-deposition.

### Claim 5 (depends on 1)

The organic light emitting display device of claim 1, further comprising:
a second hole transfer layer on the first electron transfer layer; and
a second emission control layer between the second hole transfer layer and the second emission layer.

### Claim 6 (depends on 5)

The organic light emitting display device of claim 5, wherein an absolute value of a highest occupied molecular orbital (HOMO) energy level of the second emission control layer is 0.10 eV to 0.50 eV larger than an absolute value of a HOMO energy level of the second hole transfer layer.

### Claim 7 (depends on 5)

The organic light emitting display device of claim 5, wherein a hole mobility of the second emission control layer is 1.0×10−1 to 1.0×10−2 times lower than a hole mobility of the second hole transfer layer.

### Claim 8 (depends on 1)

The organic light emitting display device of claim 1,
wherein the first electron transfer layer comprises the first material and the second material.

### Claim 9 (depends on 8)

The organic light emitting display device of claim 8, further comprising:
a first hole transfer layer on the anode; and
a first emission control layer between the first hole transfer layer and the first emission layer.

### Claim 10 (depends on 9)

The organic light emitting display device of claim 9, wherein an absolute value of a highest occupied molecular orbital (HOMO) energy level of the first emission control layer is 0.10 eV to 0.50 eV larger than an absolute value of a HOMO energy level of the first hole transfer layer.

### Claim 11 (depends on 9)

The organic light emitting display device of claim 9, wherein a hole mobility of the first emission control layer is 1.0×10−1 to 1.0×10−2 times lower than a hole mobility of the first hole transfer layer.

### Claim 12 (depends on 8)

The organic light emitting display device of claim 8, further comprising:
a second hole transfer layer on the first electron transfer layer; and
a second emission control layer between the second hole transfer layer and the second emission layer.

### Claim 13 (depends on 12)

The organic light emitting display device of claim 12, wherein an absolute value of a highest occupied molecular orbital (HOMO) energy level of the second emission control layer is 0.10 eV to 0.50 eV larger than an absolute value of a HOMO energy level of the second hole transfer layer.

### Claim 14 (depends on 12)

The organic light emitting display device of claim 12, wherein a hole mobility of the second emission control layer is 1.0×10−1 to 1.0×10−2 times lower than a hole mobility of the second hole transfer layer.

### Claim 15 (depends on 1)

The organic light emitting display device of claim 1, wherein an absolute value of the LUMO energy level of the first electron transfer layer is within a range of 2.00 eV to 2.50 eV, and an absolute value of the LUMO energy level of the N-type charge generation layer is within a range of 2.90 eV to 3.20 eV.

### Claim 16 (depends on 1)

The organic light emitting display device of claim 1, further comprising:
an emission control layer under at least one of the first emission layer and the second emission layer.

### Claim 17 (depends on 1)

The organic light emitting display device of claim 1, wherein the first emission layer and the second emission layer emit light having the same color.

### Claim 18 (depends on 1)

The organic light emitting display device of claim 1, wherein a ratio of the first material and the second material is 1:1 in wt %.

### Claim 19

An organic light emitting display device, comprising:
an anode on a substrate;
a first emission part on the anode, the first emission part including a first hole transfer layer, a first emission layer, and a first electron transfer layer;
a second emission part on the first emission part, the second emission part including a second hole transfer layer, a second emission layer, and a second electron transfer layer;
an N-type charge generation layer between the first emission part and the second emission part; and
a cathode on the second emission part,
wherein at least one among the first emission part and the second emission part comprises an emission control layer having an absolute value of a highest occupied molecular orbital (HOMO) energy level which is larger than an absolute value of a HOMO energy level of the first hole transfer layer or the second hole transfer layer,
wherein at least one among the first electron transfer layer and the second electron transfer layer includes at least two materials that are mixed through co-deposition,
wherein a first material of the at least two materials has an absolute value of a lowest unoccupied molecular orbital (LUMO) energy level within a first range of 2.91 eV to 3.40 eV and a second material of the at least two materials has an absolute value of a lowest unoccupied molecular orbital (LUMO) energy level within a second range of 2.60 eV to 2.90 eV,
wherein the first range and the second range do not overlap,
wherein the first electron transfer layer comprises one among the at least two materials, and the second electron transfer layer comprises the at least two materials, and
wherein a difference between a LUMO energy level of the first electron transfer layer and a LUMO energy level of the N-type charge generation layer is 0.50 eV to 1.00 eV.

### Claim 20 (depends on 19)

The organic light emitting display device of claim 19, wherein the absolute value of the HOMO energy level of the emission control layer is 0.10 eV to 0.50 eV larger than the absolute value of the HOMO energy level of the first hole transfer layer or the second hole transfer layer.

### Claim 21 (depends on 19)

The organic light emitting display device of claim 19, wherein a hole mobility of the emission control layer is 1.0×10−1 to 1.0×10−2 times lower than a hole mobility of the first hole transfer layer or the second hole transfer layer.

### Claim 22 (depends on 19)

The organic light emitting display device of claim 19, wherein a material having a small absolute value of the LUMO energy level among the at least two materials is higher in amount than another material having a large absolute value of the LUMO energy level among the at least two materials.

### Claim 23 (depends on 22)

The organic light emitting display device of claim 22, wherein the emission control layer is provided in the second emission part and between the second hole transfer layer and the second emission layer.

### Claim 24 (depends on 19)

The organic light emitting display device of claim 19, wherein each of the first electron transfer layer and the second electron transfer layer comprises the at least two materials, and a material having a small absolute value of the LUMO energy level among the at least two materials is higher in amount than another material having a large absolute value of the LUMO energy level among the at least two materials.

### Claim 25 (depends on 24)

The organic light emitting display device of claim 24, wherein the emission control layer is provided in the first emission part and the second emission part, between the first hole transfer layer and the first emission layer, and between the second hole transfer layer and the second emission layer.

### Claim 26 (depends on 19)

The organic light emitting display device of claim 19, wherein the emission control layer is provided in the first emission part and between the first hole transfer layer and the first emission layer.

### Claim 27 (depends on 19)

The organic light emitting display device of claim 19, wherein the emission control layer is provided in the second emission part and between the second hole transfer layer and the second emission layer.

### Claim 28 (depends on 19)

The organic light emitting display device of claim 19, wherein the first electron transfer layer comprises one among anthracene derivatives, triazine derivatives, and carbozole derivatives.

### Claim 29 (depends on 19)

The organic light emitting display device of claim 19, wherein a ratio of the first material and the second material is 1:1 in wt %.