Light emitting material and organic light-emitting device

• US 7,396,598 B2
• Filed: 06/20/2002
• Issued: 07/08/2008
• Est. Priority Date: 06/20/2001
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Showa Denko KK
• Inventors: Naijo, Shuichi, Igarashi, Takeshi, Takahashi, Yoshiaki, Ito, Naoko, Takeuchi, Masataka, Kamachi, Motoaki, Shirane, Koro
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US10/481,442
• Publication Number:
  US 20040247934A1
• Time in Patent Office: 2,210 Days
• Field of Search: None
• US Class Current: 428/690
• CPC Class Codes: C08G 2261/1526 of Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/141 comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

A polymer light emitting material, wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer. The polymer light emitting material exhibits high light emission efficiency above 5%, which is the limit of external quantum efficiency of fluorescence and can be designed so as to have a large area and hence are suitable for mass production of organic light emitting devices.

Claims

1. A polymer light-emitting material wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer, wherein said material is obtained by polymerizing a polymerizable composition containing at least one polymerizable light emitting compound represented by the formula (H-1) below:

4. A light emitting composition comprising the polymer light emitting material according to claim 1, and a carrier transporting polymer compound.

5. The light emitting composition according to claim 4, wherein the carrier transporting polymer compound is a hole transporting polymer compound.

6. The light emitting composition according to claim 4, wherein the carrier transporting polymer compound is an electron transporting polymer compound.

7. A light emitting composition comprising the light emitting material according to claim 1, and a carrier transporting compound.

8. The light emitting composition according to claim 7, wherein the carrier transporting compound is a hole transporting compound.

9. The light emitting composition according to claim 7, wherein the carrier transporting compound is an electron transporting compound.

10. A layer containing a light emitting material for organic light emitting device, wherein a light emitting material is a polymer light emitting material described in claim 1.

11. The layer containing a light emitting material for organic light emitting device according to claim 10, wherein the polymer light emitting material is obtained by forming a polymerizable composition containing at least one light emitting compound into a film and then polymerizing it.

12. The layer containing a light emitting material for organic light emitting device according to claim 11, wherein the polymer light emitting material has no crosslinking structure.

13. The layer containing a light emitting material for organic light emitting device according to claim 11, wherein the polymer light emitting material has a crosslinking structure.

14. A layer containing a light emitting material for organic light emitting device obtained by forming into a film a polymer light emitting material described in claim 1.

15. The layer containing a light emitting material for organic light emitting device according to claim 14, wherein the polymer light emitting material has no crosslinking structure.

16. An organic light emitting device comprising the polymer light emitting material according to claim 1.

17. The organic light emitting device according to claim 16, comprising a light emitting layer comprising the polymer light emitting material having on both sides or one side thereof an electron transporting layer of a coated type, and/or a hole transporting layer of a coated type.

18. The polymer light emitting material according to claim 1, which is obtained by homopolymerizing the polymerizable compound represented by formula (H-1).

19. The polymer light emitting material according to claim 1, which is obtained by copolymerizing the polymerizable compound represented by formula (H-1) and bisstyryloxadiazole.

2. A polymer light-emitting material wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer, wherein said material is obtained by polymerizing a polymerizable composition containing at least one polymerizable light emitting compound represented by the formula (H-1) below:

3. A polymer light-emitting material wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer, wherein said material is obtained by polymerizing a polymerizable composition containing at least one polymerizable light emitting compound represented by the formula (H-1) below: