Organic electroluminescence device emitting white light

• US 20020168544A1
• Filed: 12/28/2000
• Published: 11/14/2002
• Est. Priority Date: 12/28/1999
• Status: Active Grant

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Fukuoka, Kenichi, Hosokawa, Chishio, Tagami, Sanae
• Granted Patent: US 6,803,120 B2
• 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 emitting white light 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 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.

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

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

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

5. An organic electroluminescence device emitting white light according to claim 1, wherein the layer of a light emitting medium comprises a light emitting layer emitting blue light and a layer comprising the fluorescent compound.

6. An organic electroluminescence device emitting white light according to claim 2, wherein light emitting layer A comprises the light emitting material emitting blue light and a fluorescent dopant emitting blue light.

7. An organic electroluminescence device emitting white light according to claim 3, wherein light emitting layer A comprises the light emitting material emitting blue light and a fluorescent dopant emitting blue light.

8. An organic electroluminescence device emitting white light according to claim 4, wherein light emitting layer B comprises the light emitting material emitting blue light and a fluorescent dopant emitting blue light.

9. An organic electroluminescence device emitting white light according to claim 3, wherein the light emitting layer emitting blue light comprises the light emitting material emitting blue light and a fluorescent dopant emitting blue light.

10. An organic electroluminescence device emitting white light according to claim 5, wherein the light emitting layer emitting blue light comprises the light emitting material emitting blue light and a fluorescent dopant emitting blue light.

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

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

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

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

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

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

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

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

19. An organic electroluminescence device emitting white light according to claim 18, wherein the styryl derivative is at least one compound selected from distyryl derivatives, tristyryl derivatives, tetrastyryl derivatives and styrylamine derivatives.

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

21. An organic electroluminescence device emitting white light 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. An organic electroluminescence device emitting white light 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. An organic electroluminescence device emitting white light 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. An organic electroluminescence device emitting white light 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. An organic electroluminescence device emitting white light 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. An organic electroluminescence device emitting white light 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.

27. An organic electroluminescence device emitting white light according to claim 10, 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. An organic electroluminescence device emitting white light according to claim 1, wherein the fluorescent compound has an electron-donating group.

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