ORGANIC ELECTROLUMINESCENCE DEVICE EMITTING WHITE LIGHT

• US 20070134515A1
• Filed: 02/15/2007
• Published: 06/14/2007
• Est. Priority Date: 12/28/1999
• Status: Abandoned Application

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Fukuoka, Kenichi, Hosokawa, Chishio, Tagami, Sanae
• Application Number:
  US11/675,310
• Publication Number:
  US 20070134515A1
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1003 Carbocyclic compounds
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1014 bridged by heteroatoms, e.g. N, P, Si or B
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/60 Organic compounds having low molecular weight H10K85/10 - H10K85/50 take precedence
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/623 containing five rings, e.g. pentacene
• CPC Class Codes: H10K 85/624 containing six or more rings
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescence device emitting white light which emits white light and exhibits properties sufficient for practical applications, i.e., a high efficiency of light emission and a long life, is provided. The organic electroluminescence device emitting white light comprises a pair of electrodes and a layer of a light emitting medium disposed between the pair of electrodes, wherein the layer of a light emitting medium comprises a light emitting material emitting blue light and a fluorescent compound having at least one structure selected from a fluoranthene skeleton structure, a pentacene skeleton structure and a perylene skeleton structure.

Claims

1. An organic electroluminescence device which comprises a pair of electrodes and a layer of a light emitting medium disposed between the pair of electrodes, wherein the layer of a light emitting medium comprises a material emitting blue light and a fluorescent compound having a perylene skeleton structure, wherein the fluorescent compound has a peak wavelength of fluorescence at 540 nm or more.

2. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium comprises a light emitting layer A comprising the material emitting blue light and the fluorescent compound.

3. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium comprises a light emitting layer emitting blue light and a light emitting layer A which comprises the material emitting blue light and the fluorescent compound.

4. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium comprises a light emitting layer B comprising the material emitting blue light and a layer comprising the fluorescent compound.

6. The organic electroluminescence device according to claim 2, wherein light emitting layer A further comprises a fluorescent dopant emitting blue light.

7. The organic electroluminescence device according to claim 3, wherein light emitting layer A further comprises a fluorescent dopant emitting blue light.

8. The organic electroluminescence device according to claim 4, wherein light emitting layer B further comprises a fluorescent dopant emitting blue light.

9. The organic electroluminescence device according to claim 3, wherein the light emitting layer emitting blue light further comprises a fluorescent dopant emitting blue light.

11. An The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium comprises a hole transporting material or a hole injecting material.

12. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium comprises a hole transporting layer or a hole injecting layer.

13. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium comprises an electron transporting material or an electron injecting material.

14. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium comprises an electron transporting layer or an electron injecting layer.

15. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium which contacts an anode and comprises an oxidizing agent.

16. The organic electroluminescence device according to claim 1, wherein the layer of a light emitting medium contacts a cathode and comprises a reducing agent.

17. The organic electroluminescence device according to claim 1, wherein a layer of an inorganic compound is disposed between at least one of the electrodes and the layer of a light emitting medium.

18. The organic electroluminescence device according to claim 1, wherein the light emitting material emitting blue light is a styryl derivative, an anthracene derivative or an aromatic amine.

20. The organic electroluminescence device according to claim 18, wherein the anthracene derivative is a compound having a phenylanthracene skeleton structure.

21. The organic electroluminescence device according to claim 18, wherein the aromatic amine is a compound having 2 to 4 nitrogen atoms which are substituted with an aromatic group.

22. The organic electroluminescence device according to claim 18, wherein the aromatic amine is a compound having 2 to 4 nitrogen atoms which are substituted with an aromatic group and having at least one alkenyl group.

23. The organic electroluminescence device according to claim 6, wherein the fluorescent dopant emitting blue light is at least one compound selected from styrylamines, styryl compounds substituted with an amine and compounds having a condensed aromatic ring.

24. The organic electroluminescence device according to claim 7, wherein the fluorescent dopant emitting blue light is at least one compound selected from styrylamines, styryl compounds substituted with an amine and compounds having a condensed aromatic ring.

25. The organic electroluminescence device according to claim 8, wherein the fluorescent dopant emitting blue light is at least one compound selected from styrylamines, styryl compounds substituted with an amine and compounds having a condensed aromatic ring.

26. The organic electroluminescence device according to claim 9, wherein the fluorescent dopant emitting blue light is at least one compound selected from styrylamines, styryl compounds substituted with an amine and compounds having a condensed aromatic ring.

28. The organic electroluminescence device according to claim 1, wherein the fluorescent compound has an electron-donating group.

29. The organic electroluminescence device according to claim 1, wherein the fluorescent compound has a peak wavelength of fluorescence at 540 to 650 nm.

30. The organic electroluminescence device according to claim 1, which emits white light.

5. (canceled)

10. (canceled)

19. The organic electroluminescence device according to Claim I8, wherein the styryl derivative is at least one compound selected from distyryl derivatives, tristyryl derivatives, tetrastyryl derivatives and styrylamine derivatives.

27. (canceled)