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

Shin Rong Tseng, Shiuan Yi Li, Hsin-Fei Meng*, Yi Hsiang Yu, Chia Ming Yang, Hua Hsien Liao, Sheng Fu Horng, Chain-Shu Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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. CsFAl 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 cdA at deep blue with the corresponding external quantum efficiency of 2%.

Original languageEnglish
Article number084510
JournalJournal of Applied Physics
Issue number8
StatePublished - 8 May 2007

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