Organic light emitting diode, display panel and display device

Patent metadata

Field	Value
Publication number	US-11374191-B2
Application number	US-202016881051-A
Country	US
Kind code	B2
Filing date	May 22, 2020
Priority date	Sep 30, 2018
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

Provided are an OLED, display panel and display device. The OLED includes a first electrode, a second electrode, a light emitting layer and at least one blocking layer. The second electrode is arranged opposite to the first electrode. The light emitting layer is arranged between the first electrode and the second electrode. The blocking layer is arranged between the light emitting layer and the second electrode and/or between the light emitting layer and the first electrode. Each blocking layer of the at least one blocking layer comprises at least two blocking materials, electron mobility of at least one blocking material of the at least two blocking materials is lower than a first preset value, electron mobility of at least another blocking material of the at least two blocking materials is higher than a second preset value, and the first preset value is lower than the second preset value.

First claim

What is claimed is:

1. An organic light emitting diode (OLED), comprising:
a first electrode;
a second electrode arranged oppositely to the first electrode;
a light emitting layer arranged between the first electrode and the second electrode; and
at least one blocking layer arranged between the light emitting layer and the second electrode, or arranged between the light emitting layer and the first electrode;

wherein each blocking layer of the at least one blocking layer comprises at least two blocking materials, electron mobility of at least one blocking material of the at least two blocking materials is lower than a first preset value, electron mobility of at least another blocking material of the at least two blocking materials is higher than a second preset value, and the first preset value is lower than the second preset value;
wherein the at least one blocking layer comprises a hole blocking layer, the hole blocking layer is arranged between the light emitting layer and the second electrode;
the hole blocking layer comprises a first hole blocking material and a second hole blocking material, electron mobility of the first hole blocking material is lower than electron mobility of the second hole blocking material;
wherein the electron mobility of the first hole blocking material is represented as B1, and 1.0×10 −6 cm 2 /(V·s)≤B1≤1.0×10 −5 cm 2 /(V·s);
the electron mobility of the second hole blocking material is represented as C1, and 1.0×10 −5 cm 2 /(V·s)≤C1≤1.0×10 −4 cm 2 /(V·s).

2. The OLED of claim 1 , wherein the each blocking layer comprises a first blocking material and a second blocking material, wherein electron mobility of the first blocking material is lower than electron mobility of the second blocking material;
in the each blocking layer, a sum of a volume of the first blocking material and a volume of the second blocking material is represented as S, the volume of the first blocking material is represented as X, and 10%≤X/S≤70%.

3. The OLED of claim 2 , Wherein, in the each blocking layer, the volume of the first blocking material and the volume of the second blocking material satisfy a following relation: 20%≤X/S≤50%.

4. The OLED of claim 1 , wherein
in the hole blocking layer, a sum of a volume of the first hole blocking material and a volume of the second hole blocking material is represented as S1, the volume of the first hole blocking material is represented as X1, and 10%≤X1/S1≤60%.

5. The OLED of claim 1 , wherein, in the hole blocking layer, a ratio of the volume of the first hole blocking material to the sum of the volume of the first hold blocking material and the volume of the second hole blocking material satisfies: 20%≤X1/S1≤50%.

6. The OLED of claim 1 , wherein a volume ratio of the first hole blocking material to the second hole blocking material is 1:1.

7. The OLED of claim 1 , wherein the at least one blocking layer comprises an electron blocking layer, the electron blocking layer is arranged between the light emitting layer and the first electrode;
the electron blocking layer comprises a first electron blocking material and a second electron blocking material, electron mobility of the first electron blocking material is lower than electron mobility of the second electron blocking material;
in the electron blocking layer, a sum of a volume of the first electron blocking material and a volume of the second electron blocking material is represented as S2, a volume of the first electron blocking material is represented as X2, and 20%≤X2/S2≤70%.

8. The OLED of claim 7 , wherein, in the electron blocking layer, a ratio of the volume of the first electron blocking material to the sum of the volume of the first electron blocking material and the volume of the second electron blocking material satisfies; 30%≤X2/S2≤60%.

9. The OLED of claim 7 , wherein a volume ratio of the first electron blocking material to the second electron blocking material is 1:1.

10. The OLED of claim 7 , wherein the electron mobility of the first electron blocking material is represented as B2, and 1.0×10 −7 cm 2 /(V·s)≤B2≤1.0×10 −5 cm 2 /(V·s);
the electron mobility of the second electron blocking material is represented as C2, and 1.0×10 −5 cm 2 /(V·s)≤C2≤1.0×10 −4 cm 2 /(V·s).

11. The OLED of claim 1 , further comprising a first carrier function layer and a second carrier function layer;
wherein the first carrier function layer is arranged between the light emitting layer and the first electrode, and in a case where the at least one blocking layer is arranged between the light emitting layer and the first electrode, the first carrier function layer is arranged between the at least one blocking layer and the first electrode;
the second carrier function layer is arranged between the light emitting layer and the second electrode, and in a case where the at least one blocking layer is arranged between the light emitting layer and the second electrode, the second carrier function layer is arranged between the at least one blocking layer and the second electrode.

12. The OLED of claim 11 , wherein the first carrier function layer comprises a hole injection layer and a hole transport layer stacked along a direction from the first electrode towards the light emitting layer;
the second carrier function layer comprises an electron injection layer and an electron transport layer stacked along a direction from the second electrode towards the light emitting layer.

13. A display panel, comprising a substrate and a plurality of pixel units arranged in an array on a side of the substrate;
wherein at least a part of the plurality of pixel units comprises an organic light emitting diode (OLED) of claim 1 .

14. A display device, comprising the display panel of claim 13 .

15. The OLED of claim 1 , wherein the electron mobility of the first hole blocking material is 5.2×10 −6 cm 2 /(V·s), and the electron mobility of the second hole blocking material is 4.5×10 −5 cm 2 /(V·s).

16. The OLED of claim 1 , wherein in the hole blocking layer, a sum of a volume of the first hole blocking material and a volume of the second hole blocking material is represented as S1, the volume of the first hole blocking material is represented as X1, and 10%≤X1/S1≤50%.

17. The OLED of claim 1 , wherein a volume ratio of the first hole blocking material to the second hole blocking material is 1:1, the electron mobility of the first hole blocking material is 5.2×10 −6 cm 2 /(V·s), and the electron mobility of the second hole blocking material is 4.5×10 −5 cm 2 /(V·s).

Assignees

• Yungu Guan Tech Co Ltd

Inventors

• Li Weiwei
• He Lin
• Li Mengzhen
• Tian Jingwen
• Li Tiantian

Classifications

• H10K2101/00

  Properties of the organic materials covered by group H10K85/00 · CPC title

• H01L27/3218

  Electricity · mapped topic

• H01L51/5072

  Electricity · mapped topic

• H01L51/5096 Primary

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic