Flexible display apparatus and its white light organic electroluminescent device

Patent metadata

Field	Value
Publication number	US-10424756-B2
Application number	US-201715553544-A
Country	US
Kind code	B2
Filing date	Jul 17, 2017
Priority date	Jun 22, 2017
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

The present application provides a flexible display apparatus and a white light organic electroluminescent device including an anode, a first blue light emitting unit, a second yellow light emitting unit, a third blue light emitting unit, and a cathode successively laminated and disposed, wherein the second yellow light emitting unit including a red light emitting layer. The flexible display apparatus and a white light organic electroluminescent device provided by the application enhances the luminous intensity of the red light band in the three-laminated layer white light organic electroluminescent device by adding a red light emitting layer, and optimizes the spectrum of the white OLED device, when used as a display device it can reduce power consumption of the display apparatus.

First claim

What is claimed is:

1. A white light organic electroluminescent device, wherein the white light organic electroluminescent device comprises: an anode, a first blue light emitting unit, a second yellow light emitting unit, a third blue light emitting unit, and a cathode successively laminated and disposed, wherein the second yellow light emitting unit comprising a red light emitting layer; wherein the material used for the red light emitting layer is TCTA: 3% Ir(piq)3.

2. The white light organic electroluminescent device according to claim 1 , wherein the thickness of the red light emitting layer is less than or equal to 5 nm.

3. The white light organic electroluminescent device according to claim 1 , wherein the first blue light emitting unit comprises: a first hole injection layer, a first hole transport layer, a first blue light emitting layer, a first electron transport layer, a first N-type charge generation layer successively laminated and disposed on the anode.

4. The white light organic electroluminescent device according to claim 3 , wherein the second yellow light emitting unit comprises: a second p-type charge generation layer, a second hole transport layer, a second yellow light emitting layer, a second electron transport layer, a second N-type charge generation layer successively laminated and disposed on the first N-type charge generation layer, and the red light emitting layer is located above the second hole transport layer.

5. The white light organic electroluminescent device according to claim 4 , wherein the third blue light emitting unit comprises: a third P-type charge generation layer, a third hole transport layer, a third blue light emitting layer, a third electron transport layer, and a third electron injection layer successively laminated and disposed on the second N-type charge generation layer.

6. The white light organic electroluminescent device according to claim 5 , wherein the material of the third P-type charge generation layer is HATCN, and having a thickness of 10 nm;
the material of the third hole transport layer is β-NPB, and having a thickness of 95 nm;
the material of the third blue light emitting unit is MADN: 3% DSA-ph, and having a thickness of 25 nm;
the material of the third electron transport layer is BmPyPb, and having a thickness of 20 nm; and
the material of the third electron injecting layer is LiF, and having a thickness of 1 nm.

7. The white light organic electroluminescent device according to claim 4 , wherein the material of the second P-type charge generation layer is HATCN, and having a thickness of 10 nm;
the material of the second hole transport layer is β-NPB, and having a thickness of 30 nm;
the material of the second yellow light emitting layer is DCZPPY:Ir(BT)2(acac), and having a thickness of 30 nm;
the material of the second electron transport layer is BmPyPb, and having a thickness of 20 nm; and
the material of the second N-type charge generation layer is BmPyPb: 4% Li, and having a thickness of 20 nm.

8. The white light organic electroluminescent device according to claim 3 , wherein the material of the first hole injection layer is MoO3, and having a thickness of 1 nm;
the material of the first hole transport layer is β-NPB, and having the thickness of 160 nm;
the material of the first blue light emitting layer is MADN: 3% DSA-ph, and having a thickness of 25 nm;
the material of the first electron transport layer is BmPyPb, and having a thickness of 10 nm; and
the material of the first N-type charge generation layer is BmPyPb:4% Li, and having a thickness of 10 nm.

9. A flexible display apparatus, wherein the flexible display apparatus is using a white light organic electroluminescent device as a light emitting source, the white light organic electroluminescent device comprises: an anode, a first blue light emitting unit, a second yellow light emitting unit, a third blue light emitting unit, and a cathode successively laminated and disposed, wherein the second yellow light emitting unit comprising a red light emitting layer; wherein the material used for the red light emitting layer is TCTA: 3% Ir(piq)3.

10. The white light organic electroluminescent device according to claim 9 , wherein the thickness of the red light emitting layer is less than or equal to 5 nm.

11. The white light organic electroluminescent device according to claim 9 , wherein the first blue light emitting unit comprises: a first hole injection layer, a first hole transport layer, a first blue light emitting layer, a first electron transport layer, a first N-type charge generation layer successively laminated and disposed on the anode.

12. The white light organic electroluminescent device according to claim 11 , wherein the second yellow light emitting unit comprises: a second p-type charge generation layer, a second hole transport layer, a second yellow light emitting layer, a second electron transport layer, a second N-type charge generation layer successively laminated and disposed on the first N-type charge generation layer, and the red light emitting layer is located above the second hole transport layer.

13. The white light organic electroluminescent device according to claim 12 , wherein the third blue light emitting unit comprises: a third P-type charge generation layer, a third hole transport layer, a third blue light emitting layer, a third electron transport layer, and a third electron injection layer successively laminated and disposed on the second N-type charge generation layer.

14. The white light organic electroluminescent device according to claim 13 , wherein the material of the third P-type charge generation layer is HATCN, and having a thickness of 10 nm;
the material of the third hole transport layer is β-NPB, and having a thickness of 95 nm;
the material of the third blue light emitting unit is MADN: 3% DSA-ph, and having a thickness of 25 nm;
the material of the third electron transport layer is BmPyPb, and having a thickness of 20 nm; and
the material of the third electron injecting layer is LiF, and having a thickness of 1 nm.

15. The white light organic electroluminescent device according to claim 12 , wherein the material of the second P-type charge generation layer is HATCN, and having a thickness of 10 nm;
the material of the second hole transport layer is β-NPB, and having a thickness of 30 nm;
the material of the second yellow light emitting layer is DCZPPY:Ir(BT)2(acac), and having a thickness of 30 nm;
the material of the second electron transport layer is BmPyPb, and having a thickness of 20 nm; and
the material of the second N-type charge generation layer is BmPyPb: 4% Li, and having a thickness of 20 nm.

16. The white light organic electroluminescent device according to claim 11 , wherein the material of the first hole injection layer is MoO3, and having a thickness of 1 nm;
the material of the first hole transport layer is β-NPB, and having the thickness of 160 nm;
the material of the first blue light emitting layer is MADN: 3% DSA-ph, and having a thickness of 25 nm;
the material of the first electron transport layer is BmPyPb, and having a thickness of 10 nm; and
the material of the first N-type charge generation layer is BmPyPb:4% Li, and having a thickness of 10 nm.

Assignees

• Shenzhen China Star Optoelect

Inventors

• Tu Aiguo
• Li Jinchuan
• Jiang Liang
• Yuan Wei
• Liu Yang
• Jiao Shibo

Classifications

• H01L51/0061

  Electricity · mapped topic

• H01L2251/303

  Electricity · mapped topic

• H01L51/0034

  Electricity · mapped topic

• H01L2251/5338

  Electricity · mapped topic

• H01L27/3209

  Electricity · mapped topic