標題: Bright-white light-emitting devices based on a single polymer exhibiting simultaneous blue, green, and red emissions
作者: Chuang, Chu-Ying
Shih, Ping-I
Chien, Chen-Han
Wu, Fang-Iy
Shu, Ching-Fong
應用化學系
Department of Applied Chemistry
公開日期: 23-一月-2007
摘要: We have developed efficient white-light-emitting polymers through the incorporation of low band gap green-light-emitting benzothiadiazole and red-light-emitting bisthiophenylbenzothiadiazole moieties into the backbone of a blue-light-emitting bipolar polyfluorene copolymer. Partial energy transfer from the blue-fluorescent polyfluorene backbone to the green- and red-fluorescent components resulted in individual emissions from the three emissive species. By carefully controlling the concentrations of the low-energy-emitting species in the resulting copolymers, the emission of white light, with contributions from each of the three primary colors, was achieved. Efficient polymer light-emitting devices prepared using these copolymers exhibited luminance efficiencies as high as 4.87 cd/A with color coordinates (0.37, 0.36) that were very close to the ideal CIE chromaticity coordinates for pure white light (0.33, 0.33). In addition, the color coordinates remained almost unchanged over a range of operating potentials. A mechanistic study suggested that energy transfer from the fluorene segments to the low band gap units, rather than charge trapping, was the main operating process involved in the electroluminescent process.
URI: http://dx.doi.org/10.1021/ma062192+
http://hdl.handle.net/11536/17002
ISSN: 0024-9297
DOI: 10.1021/ma062192+
期刊: MACROMOLECULES
Volume: 40
Issue: 2
起始頁: 247
結束頁: 252
顯示於類別:期刊論文


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