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Title:
LIGHT EMITTING ELEMENT
Document Type and Number:
Japanese Patent JP2004179142
Kind Code:
A
Abstract:

To provide a light emitting element including a plurality of light emitting layers capable of improving light emitting efficiency and reliability (service life of an element).

This light emitting element (organic EL element) is provided with an orange color light emitting layer 23 formed on a glass board 1, and a blue color light emitting layer 24 formed to be laminated in relation to the orange color light emitting layer 23 and for emitting the light having a wave length different from that of the orange color light emitting layer 23. The orange color light emitting layer 23 contains NPB as a host material, DBzR as a light emitting dopant, and tBuDPN as an auxiliary dopant having a function for delivering the energy from the host material to the light emitting dopant. The blue color light emitting layer 24 contains TBADN as a host material, TBT as a light emitting dopant, and NPB as an auxiliary dopant for assisting transportation of a carrier.


Inventors:
Hamada, Yuji
Jinno, Hiroshi
Nishimura, Kazuki
Application Number:
JP2003000144278
Publication Date:
June 24, 2004
Filing Date:
May 22, 2003
Export Citation:
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Assignee:
SANYO ELECTRIC CO LTD
International Classes:
H05B33/12; H01J1/68; H01L51/50; H05B33/14; (IPC1-7): H05B33/12; H05B33/14