Efficient ultraviolet-blue polymer light-emitting diodes based on a fluorene-based non-conjugated polymer

Fei Huang, Yu Hua Niu, Michelle S. Liu, Xing Hua Zhou, Yan Qing Tian, Alex K.Y. Jen

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Abstract

Efficient UV-blue polymer light-emitting diodes based on a fluorene-based nonconjugated polymer, poly[2,7-(9,9-dihexylfluorene)-alt-4,4'-phenylether] (PFPE), are fabricated. The device with PFPE as emitting layer shows a very narrow ultraviolet-blue electroluminescence emission with a peak at 397 nm and a maximal external quantum efficiency of 1.07%. By blending PFPE into poly(N-vinylcarbazole) (PVK), the device performance can be further improved. A maximum external quantum efficiency of 1.81%, with a maximum irradiance power density of 1223 μW/cm 2, was reached by using a blend of PVK and PFPE in the weight ratio of 95:5 as emitting layer.

Original languageEnglish (US)
Article number081104
JournalApplied Physics Letters
Volume89
Issue number8
DOIs
StatePublished - Aug 31 2006

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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