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Title:
有機EL素子
Document Type and Number:
Japanese Patent JP4441863
Kind Code:
B2
Abstract:

To provide an organic EL element with an organic layer having a plurality of light emitting layers different at least in light emission color laminated between a pair of electrodes, with which the service life can be lengthened for emitting light for a long time with predetermined brightness.

The organic EL element consists of an organic layer 5 having at least a plurality of light emitting layers (first and second light emitting layers) 5b and 5c between a pair of electrodes. The respective light emitting layers 5b and 5c are formed by mixing a host material, light emitting materials different in the highest occupancy orbit level and a hole transporting material respectively. In addition, the element is formed such that concentrations of the host material and the hole transporting material included in the light emitting layer 5b are high with a larger difference in the highest occupancy orbit level.

COPYRIGHT: (C)2006,JPO&NCIPI


Inventors:
Masahiro Minagawa
Application Number:
JP2004190940A
Publication Date:
March 31, 2010
Filing Date:
June 29, 2004
Export Citation:
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Assignee:
Nippon Seiki Co., Ltd.
International Classes:
H01L51/50; H05B33/12
Domestic Patent References:
JP2002367784A
JP200152870A
JP2003151776A
JP2002343571A