Claims
- 1. An organic electroluminescent device comprising an anode, a cathode and, between said anode and cathode, at least one organic thin-film layer which contains a compound represented by the following formula (I): wherein R1 to R4 each independently represents a hydrogen atom, a halogen atom, an amino group, a hydroxyl group, a cyano group, a nitro group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryloxy group; or R1 to R4 may be coupled together to form a ring.
- 2. The organic electroluminescent device, according to claim 1, wherein at least one of the groups R1 to R4 is not a methyl group.
- 3. The organic electroluminescent device, according to claim 1, wherein at least one of a hole transport layer and an electron transport layer contains the compound of formula (I) either singly or as a mixture.
- 4. The organic electroluminescent device, according to claim 3, wherein said at least one organic thin film layer has a film thickness within a range of several nm to one μm.
- 5. The organic electroluminescent device, according to claim 4, wherein said anode has a work function of at least 4.5 eV.
- 6. The organic electroluminescent device, according to claim 1, wherein said compound represented by formula (I) is singly used to form a light-emitting layer.
- 7. The organic electroluminescent device, according to claim 6, wherein only said light-emitting layer exists as said at least one organic thin-film layer.
- 8. The organic electroluminescent device, according to claim 6, wherein said light-emitting layer and a hole transport layer exist as said at least one organic thin-film layer.
- 9. The organic electroluminescent device, according to claim 6, wherein said light-emitting layer and an electron transport layer exist as said at least one organic thin-film layer.
- 10. The organic electroluminescent device, according to claim 6, wherein a hole transport layer, said light-emitting layer and an electron transport layer exist as said at least one organic thin-film layer.
- 11. The organic electroluminescent device, according to claim 1, wherein said compound represent by formula (I) is used as a mixture to form a light-emitting layer.
- 12. The organic electroluminescent device, according to claim 11, wherein said light-emitting layer contains the compound represented by formula (I) and a hole transporting material, and an electron transport layer further exists as said at least one organic thin-film layer.
- 13. The organic electroluminescent device, according to claim 11, wherein said light-emitting layer contains the compound represented by formula (I) and an electron transporting material, and a hole transport layer further exists as said at least one organic thin-film layer.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 09/225,284 filed on Jan. 4, 1999 now U.S. Pat. No. 6,322,908 B1.
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Continuations (1)
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Number |
Date |
Country |
Parent |
09/225284 |
Jan 1999 |
US |
Child |
09/901431 |
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US |