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US08703303B2 Organic electroluminescent device having a light-emitting layer comprising a host material of two or more compounds 有权
具有包含两种或更多种化合物的主体材料的发光层的有机电致发光器件

Organic electroluminescent device having a light-emitting layer comprising a host material of two or more compounds
Abstract:
Disclosed is an organic electroluminescent device (organic EL device) that is improved in the luminous efficiency, fully secured of the driving stability, and of a simple structure. The organic EL device comprises a light-emitting layer between an anode and a cathode piled one upon another on a substrate and the said light-emitting layer comprises (A) a phosphorescent dopant whose emission peak wavelength is longer than 600 nm and (B) a host material. The host material contains at least two kinds of compounds selected from two or more kinds of derivatives included in (b1) N-substituted indolocarbazole derivatives, (b2) derivatives of 8-hydroxyquinoline aluminum complex, and (b3) bisindolocarbazole derivatives.
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