ORGANIC ELECTROLUMINESCENT DEVICE

• US 20090001878A1
• Filed: 04/03/2008
• Published: 01/01/2009
• Est. Priority Date: 04/03/2007
• Status: Abandoned Application

• Current Assignee: Kunshan Visionox Technology Co., Ltd., Tsinghua University, Beijing Visionox Technology Co., Ltd. (Visionox Technology, Inc.)
• Original Assignee: Kunshan Visionox Technology Co., Ltd., Tsinghua University, Beijing Visionox Technology Co., Ltd. (Visionox Technology, Inc.)
• Inventors: Xie, Jing, Duan, Lian, Qiu, Yong, Gao, Yudi
• Application Number:
  US12/062,013
• Publication Number:
  US 20090001878A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers

Abstract

An organic electroluminescent device includes an anode, a cathode and an organic functional layer between the anode and the cathode, in which at least one of hole injection layer, hole transport layer and electron transport layer includes a host material and an inorganic inactive material doped in the host material, and the inorganic inactive material is a halide, oxide or carbonate of metal.

Claims

1. An organic electroluminescent device comprising

an anode;

an cathode; and

an organic functional layer between the anode and the cathode;

wherein the organic functional layer comprises at least one of light emission layer, hole injection layer, hole transport layer, electron transport layer, electron injection layer and hole blocking layer, and at least one of the hole injection layer (HIL), hole transport layer (HTL) and electron transport layer (ETL) comprises a host material and an inorganic inactive material doped in the host material.

2. The organic electroluminescent device according to claim 1, wherein the inorganic inactive material is doped in the whole host material uniformly.

3. The organic electroluminescent device according to claim 1, wherein the inorganic inactive material is doped in the partial or whole host material in a gradient manner.

4. The organic electroluminescent device according to claim 1, wherein the inorganic inactive material is doped in at least one zone of the host material.

5. The organic electroluminescent device according to claim 4, wherein the number of said zones is 1˜

5.

6. The organic electroluminescent device according to claim 1, wherein the concentration of said inorganic inactive material in the host material is 1˜

99 wt %.

7. The organic electroluminescent device according to claim 6, wherein the concentration of said inorganic inactive material in the host material is 4˜

80 wt %.

8. The organic electroluminescent device according to claim 6, wherein the concentration of said inorganic inactive material in the host material is 10˜

50 wt %.

9. The organic electroluminescent device according to claim 6, wherein the concentration of said inorganic inactive material in the host material is 30˜

40 wt %.

10. The organic electroluminescent device according to claim 1, wherein the inorganic inactive material is a halide, oxide, sulfide, carbide, nitride or carbonate of a metal, or a mixture thereof.

11. The organic electroluminescent device according to claim 10, wherein the halide, oxide, sulfide, carbide, nitride or carbonate of metal is a halide, oxide, sulfide, carbide, nitride or carbonate of a transition metal, or a halide, oxide, sulfide, carbide, nitride or carbonate of a Group 5A metal of the Periodic Table.

12. The organic electroluminescent device according to claim 11, wherein the halide, oxide, sulfide, carbide, nitride or carbonate of transition metal is a halide, oxide, sulfide, carbide, nitride or carbonate of a metal of lanthanide series of the Periodic Table, and the halide, oxide, sulfide, carbide, nitride or carbonate of Group 5A metal is a halide, oxide, sulfide, carbide, nitride or carbonate of bismuth.

13. The organic electroluminescent device according to claim 12, wherein the halide, oxide, sulfide, carbide, nitride or carbonate of metal of lanthanide series is a halide, oxide, sulfide, carbide, nitride or carbonate of neodymium, samarium, praseodymium or holmium.

14. The organic electroluminescent device according to claim 1, wherein the inorganic inactive material is selected from BiF₃, BiCl₃, BiBr₃, BiI₃, Bi₂O₃, YbF₃, YbF₂, YbCl₃, YbCl₂, YbBr₃, YbBr₂, Yb₂O₃, Yb₂(CO₃)₃, and mixtures thereof.

15. The organic electroluminescent device according to claim 1, wherein the inorganic inactive material is BiF₃ or YbF₃, and the concentration of the inorganic inactive material in the host material is 30˜

40 wt %.

16. The organic electroluminescent device according to claim 1, the inorganic inactive material doped in the host material has a thickness of 10˜

200 nm in the HIL.

17. The organic electroluminescent device according to claim 1, the inorganic inactive material doped in the host material has a thickness of 5˜

20 nm in the HTL.

18. The organic electroluminescent device according to claim 1, the inorganic inactive material doped in the host material has a thickness of 5˜

20 nm in the ETL.

19. A method for preparing an organic electroluminescent device comprising an anode, an cathode, and an organic functional layer between the anode and the cathode, in which the organic functional layer comprises at least one of light emission layer, hole injection layer, hole transport layer, electron transport layer, electron injection layer and hole blocking layer, wherein an inorganic inactive material is doped in the host material of at least one of the hole injection layer (HIL), hole transport layer (HTL) and electron transport layer (ETL).

20. The method for preparing an organic electroluminescent device according to claim 19, wherein the inorganic inactive material is a halide, oxide or carbonate of a metal, or a mixture thereof.