Compositions – Light transmission modifying compositions – Modification caused by energy other than light
Patent
1997-12-10
1999-03-23
Tucker, Philip
Compositions
Light transmission modifying compositions
Modification caused by energy other than light
25230116, 313504, G02F 100, C09K 1106, H01J 162
Patent
active
058854983
ABSTRACT:
The present invention is to provide a organic light emitting device with high efficiency and long life of emitting light. The light emitting device comprises a positive electrode, a hole transporting layer, an electron transporting layer and a negative electrode on a substrate, the hole transporting layer if formed of triphenylamine tetramer as the major component, and 5,6,11,12-tetraphenylnaphthacene or 9,10-diphenylanthracene is added in a amount of 0.1-10% in the hole transporting layer. The hole transporting layer acts as a light emitting layer and suppressing reduction of luminance of the light and prevent the black spots from occurring and expanding so as to extend the life time. Furthermore, in the present invention, the transparent positive electrode is composed from two-layer structure comprising a hole injecting layer and a current distributing layer, this restricting occurrence of the black spots and reduction of the luminance due to the positive electrode.
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Inaba Ritsuo
Matsuo Mikiko
Matsushita Electric - Industrial Co., Ltd.
Tucker Philip
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