High-efficiency blue multilayer polymer light-emitting diode based on poly(9,9-dioctylfluorene)

A highly efficient blue polymer light-emitting diode based exclusively on commercial poly(9,9-dioctylfluorene) and poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-s-butylphenyl)) diphenylamine)] is demonstrated. High electroluminescent efficiency is achieved by enhancing electron currents and ma...

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Bibliographic Details
Published in:Journal of applied physics 2007-04, Vol.101 (8)
Main Authors: Tseng, Shin-Rong, Li, Shiuan-Yi, Meng, Hsin-Fei, Yu, Yi-Hsiang, Yang, Chia-Ming, Liao, Hua-Hsien, Horng, Sheng-Fu, Hsu, Chian-Shu
Format: Article
Language:English
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Summary:A highly efficient blue polymer light-emitting diode based exclusively on commercial poly(9,9-dioctylfluorene) and poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-s-butylphenyl)) diphenylamine)] is demonstrated. High electroluminescent efficiency is achieved by enhancing electron currents and making devices in multilayered structures. CsF∕Al is used as the efficient electron injection cathode, and the fabrication process is in the glove box to enhance electron mobility by reducing oxygen adsorption. The multilayer structure is prepared by the liquid buffer layer technique. The maximum efficiency is 2.5 cd∕A at deep blue with the corresponding external quantum efficiency of 2%.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2721830