標題: Highly efficient blue-light-emitting diodes from polyfluorene containing bipolar pendant groups
作者: Shu, CF
Dodda, R
Wu, FI
Liu, MS
Jen, AKY
應用化學系
Department of Applied Chemistry
公開日期: 9-Sep-2003
摘要: A highly efficient blue-light-emitting copolymer with bulky hole-transporting triphenylamine (TPA) and electron-transporting oxadiazole (OXD) pendant groups at the C-9 position of fluorene was synthesized. The results from photoluminescence and electrochemical measurements reveal that both the side chains and the polyfluorene main chain retain their own electronic characteristics in the copolymer. It shows a pure blue emission with no aggregates or excimers formed even after being annealed at 150 degreesC under nitrogen for 20 h. In addition, it also demonstrates improved charge injection and balanced charge transport in electroluminescence. The maximum external quantum efficiency of a single-layer device using this copolymer as the emitting layer is 1.21% (at a brightness of 354 cd/m(2) with driving voltage of 7.6 V). The maximum luminance of the device reaches 4080 cd/m(2) at a bias of 12.0 V and a current density of 640 mA/cm(2).
URI: http://dx.doi.org/10.1021/ma030123e
http://hdl.handle.net/11536/27535
ISSN: 0024-9297
DOI: 10.1021/ma030123e
期刊: MACROMOLECULES
Volume: 36
Issue: 18
起始頁: 6698
結束頁: 6703
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