# US 12,193,248 B2 · Organic light emitting device and display apparatus

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- Number: US 12,193,248 B2
- Document ID: US12193248B2
- Status: Granted
- Kind: B2
- Application number: 17/439,406
- Filed: 2020-12-11
- Published: 2022-11-24
- Granted: 2025-01-07
- Earliest claimed: 2020-12-11
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: BOE Technology Group Co., Ltd.
- Inventors: Lei Chen; Lixia Qiu; Kun Ma
- Web page: https://patentgrep.com/patent/US12193248B2

## CPC

- H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/12: comprising dopants
- H10K 50/18: Carrier blocking layers
- H10K 50/181: {Electron blocking layers}
- H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene}
- H10K 85/624: {containing six or more rings}
- 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 85/6574: {comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes}
- 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

Provided are an organic light emitting device and a display apparatus. An organic light emitting device includes an anode, a cathode, and an emitting layer disposed between the anode and the cathode; wherein the emitting layer includes a host material and a dopant material doped in the host material; the host material includes a first host material and a second host material, and the first host material, the second host material, the electron block layer, and the hole block layer satisfy: |HOMO1-host-HOMOEBL|≤0.2 eV,|LUMOHBL-LUMO2-host|≤0.2 eV, wherein, HOMO1-host is a HOMO energy level of the first host material; HOMOEBL is a HOMO energy level of the electron block layer; LUMO2-host is a LUMO energy level of the second host material, and LUMOHBL is a LUMO energy level of the hole block layer.

## Claims

### Claim 1

An organic light emitting device, comprising an anode, a cathode, and an emitting layer disposed between the anode and the cathode, an electron block layer being disposed between the emitting layer and the anode, and a hole block layer being disposed between the emitting layer and the cathode; wherein the emitting layer comprises a host material and a dopant material doped in the host material; the host material comprises a first host material and a second host material, and the first host material, the second host material, the electron block layer, and the hole block layer satisfy:
|HOMO1-host-HOMOEBL|≤0.2 eV,|LUMOHBL-LUMO2-host|≤0.2 eV,
wherein HOMO1-host is a highest occupied molecular orbital HOMO energy level of the first host material; HOMOEBL is a HOMO energy level of the electron block layer; LUMO2-host is a lowest unoccupied molecular orbital LUMO energy level of the second host material, and LUMOHBL is a LUMO energy level of the hole block layer.

### Claim 2 (depends on 1)

The organic light emitting device of claim 1, wherein the host material and the hole block layer satisfy:
|LUMOHBL-LUMO1-host|=0.3 eV to 0.4 eV,
wherein, LUMO1-host is a LUMO energy level of the first host material.

### Claim 3 (depends on 1)

The organic light emitting device of claim 1, wherein the second host material and the hole block layer satisfy:
|HOMOHBL-HOMO2-host|≥0.3 eV,
wherein HOMOHBL is a HOMO energy level of the hole block layer and HOMO2-host is a HOMO energy level of the second host material.

### Claim 4 (depends on 1)

The organic light emitting device of claim 1, wherein hole mobility of the electron block layer is greater than electron mobility of the electron block layer.

### Claim 5 (depends on 4)

The organic light emitting device of claim 4, wherein, the hole mobility of the electron block layer is 10−4 cm2/Vs to 10−6 cm2/Vs, and the electron mobility of the electron block layer is less than 10−8 cm2/Vs.

### Claim 6 (depends on 1)

The organic light emitting device of claim 1, wherein the hole mobility of the electron block layer is greater than 10 times that of the first host material.

### Claim 7 (depends on 1)

The organic light emitting device of claim 1, wherein the hole mobility of the electron block layer is greater than electron mobility of the second host material.

### Claim 8 (depends on 1)

The organic light emitting device of claim 1, wherein electron mobility of the hole block layer is greater than hole mobility of the hole block layer.

### Claim 9 (depends on 1)

The organic light emitting device of claim 1, wherein the hole mobility of the first host material is 10−5cm2/Vs to 10−7cm2/Vs, the electron mobility of the second host material is 10−8cm2/Vs to 10−9cm2/Vs, and the electron mobility of the hole block layer is 10−7cm2 to 10−9cm2.

### Claim 10 (depends on 1)

The organic light emitting device of claim 1, wherein in the host material, a mixing ratio of the first host material and the second host material is 2:8 to 8:2.

### Claim 11 (depends on 1)

The organic light emitting device of claim 1, wherein the first host material comprises a p-type emitting material, and the second host material comprises an n-type emitting material.

### Claim 12 (depends on 1)

The organic light emitting device of claim 1, wherein a material of the electron block layer comprises a compound having the following structural formula:
wherein Ar1 to Ar2 are independently substituted or unsubstituted aryl group with 6-30 ring carbon atoms or substituted or unsubstituted heteroaryl group with 5-20 ring atoms, and at least one of them is methyl fluorene, dibenzofuran or thiophene; L1 is a single bond or substituted aryl containing 6-30 carbon atoms; R1 to R3 are independently substituted or unsubstituted alkyl or aryl with 1-30 ring carbon atoms, or substituted or unsubstituted heteroaryl with 5-20 ring atoms.

### Claim 13 (depends on 1)

The organic light emitting device of claim 1, wherein a material of the electron block layer comprises one or more compounds having the following structural formulas:

### Claim 14 (depends on 1)

The organic light emitting device of claim 1, wherein the first host material comprises a compound having the following structural formula:
wherein Ar3 to Ar4 are independently substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted heteroaryl, aryl or heteroaryl containing silicon, cyano, halogen or deuterium; L2 is a single bond or substituted or unsubstituted aryl containing 6-30 carbon atoms.

### Claim 15 (depends on 1)

The organic light emitting device of claim 1, wherein the first host material comprises one or more of the compounds having the following structural formulas:

### Claim 16 (depends on 1)

The organic light emitting device of claim 1, wherein the second host material comprises a compound having the following structural formula:
wherein Ar5 is substituted or unsubstituted aryl or heteroaryl with 6-30 carbon atoms, or contains carbazole, dibenzofuran and thiophene; L3 is aryl with 6-20 carbon atoms.

### Claim 17 (depends on 1)

The organic light emitting device of claim 1, wherein the second host material comprises one or more of the compounds having the following structural formulas:

### Claim 18 (depends on 1)

A display apparatus comprising the organic light emitting device of claim 1.

### Claim 19 (depends on 2)

The organic light emitting device of claim 2, wherein a material of the electron block layer comprises a compound having the following structural formula:
wherein Ar1 to Ar2 are independently substituted or unsubstituted aryl group with 6-30 ring carbon atoms or substituted or unsubstituted heteroaryl group with 5-20 ring atoms, and at least one of them is methyl fluorene, dibenzofuran or thiophene; L1 is a single bond or substituted aryl containing 6-30 carbon atoms; R1 to R3 are independently substituted or unsubstituted alkyl or aryl with 1-30 ring carbon atoms, or substituted or unsubstituted heteroaryl with 5-20 ring atoms.

### Claim 20 (depends on 1)

The organic light emitting device of claim 1, wherein the first host material comprises a compound having the following structural formula:
wherein Ar3 to Ar4 are independently substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted heteroaryl, aryl or heteroaryl containing silicon, cyano, halogen or deuterium; L2 is a single bond or substituted or unsubstituted aryl containing 6-30 carbon atoms.