標題: White electroluminescence from a single polymer: A blue-emitting polyfluorene incorporating orange-emitting benzoselenadiazole segments on its main chain
作者: Chien, Chen-Han
Shih, Ping-I
Shu, Ching-Fong
應用化學系
Department of Applied Chemistry
關鍵字: conjugated polymers;copolymerization;light-emitting diodes (LED)
公開日期: 15-Jul-2007
摘要: We have developed efficient white-light-emitting polymers through the incorporation of low-bandgap orange-light-emitting benzoselenadiazole (BSeD) moieties into the backbone of a blue-light-emitting bipolar polyfluorene (PF) copolymer, which contains hole-transporting triphenylamine and electron-transporting oxadiazole pendent groups. By carefully controlling the concentrations of the low-energy-emitting species in the resulting copolymers, partial energy transfer from the blue-fluorescent PF backbone to the orange-fluorescent segments led to a single polymer emitting white light and exhibiting two balanced blue and orange emissions simultaneously. Efficient polymer light-emitting devices prepared using this copolymer exhibited luminance efficiencies as high as 4.1 cd/A with color coordinates (0.30, 0.36) located in the white-light region. Moreover, the color coordinates remained almost unchanged over a range of operating potentials. A mechanistic study revealed that energy transfer from the PF backbone to the low-bandgap segments, rather than charge trapping, was the main operating process involved in the electroluminescence process. (c) 2007 Wiley Periodicals, Inc. Inc.
URI: http://dx.doi.org/10.1002/pola.22049
http://hdl.handle.net/11536/10558
ISSN: 0887-624X
DOI: 10.1002/pola.22049
期刊: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume: 45
Issue: 14
起始頁: 2938
結束頁: 2946
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