Multicomponent emission from organic light emitting diodes based on polymer dispersion of an aromatic diamine and an oxadiazole derivative

被引:90
作者
Giro, G
Cocchi, M
Kalinowski, J
Di Marco, P
Fattori, V
机构
[1] Gdansk Tech Univ, Dept Mol Phys, PL-80952 Gdansk, Poland
[2] Natl Res Council, Inst Photochem & High Energy Radiat, I-40129 Bologna, Italy
关键词
D O I
10.1016/S0009-2614(99)01456-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electroluminescence (EL) spectra of single layer (SL) and double layer (DL) light emitting diodes (LEDs) based on N, N'-diphenyr-N, N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4' diamine (TPD) and 2-(4-biphenyl)-5-(4-tert.-butylphenyl)1,3,4-oxadiazole (PBD) molecules incorporated in bisphenol-A-polycarbonate (PC) matrix were investigated. The EL spectra of both SL and DL ((TPD + PC)/PBD) LEDs reveal several components up to four emission bands for DL structure devices. Only the blue band can be ascribed to emission of one of the dopants (TPD), the origin of other red-shifted bands show characteristics suggesting formation of excited hetero-molecular aggregates such as exciplexes and electroplexes including their modification by local energetic conditions. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:137 / 141
页数:5
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