Title:
白色系有機エレクトロルミネッセンス素子
Document Type and Number:
Japanese Patent JP4481930
Kind Code:
B2
Abstract:
An organic electroluminescence device emitting white light which comprises at least two light emitting layers and an electron transporting layer comprising a heterocyclic derivative having nitrogen atom or silicon atom which are disposed between a pair of electrodes, wherein the energy gap of a host compound in each light emitting layer is in a specific range, the energy gap of the heterocyclic derivative having nitrogen atom or silicon atom in the electron transporting layer is in a specific range, and the ionization potential of the heterocyclic derivative having nitrogen atom or silicon atom in the electron transporting layer and the ionization potential of the host compound in the light emitting layer adjacent to the electron transporting layer satisfy a specific relation. The organic electroluminescence device provides a great efficiency of light emission under a low voltage and has a long lifetime, and exhibits no change in the chromaticity.
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Inventors:
Masahide Matsuura
Fukuoka Kenichi
Hiroshi Yamamoto
Hosokawa local tide
Fukuoka Kenichi
Hiroshi Yamamoto
Hosokawa local tide
Application Number:
JP2005511501A
Publication Date:
June 16, 2010
Filing Date:
June 24, 2004
Export Citation:
Assignee:
IDEMITSU KOSAN CO.,LTD.
International Classes:
H05B33/12; C09K11/06; H01L51/50; H01L51/00
Domestic Patent References:
| JP2003187978A | ||||
| JP2003086380A | ||||
| JP2001250690A | ||||
| JP2002216969A | ||||
| JP2002343571A | ||||
| JP200556866A | ||||
| JP2004235168A | ||||
| JP200463349A | ||||
| JP200068057A |
Attorney, Agent or Firm:
Tamotsu Otani
Masamichi Tohei
Masamichi Tohei