標題: Novel oxadiazole-containing polyfluorene with efficient blue electroluminescence
作者: Wu, FI
Reddy, DS
Shu, CF
Liu, MS
Jen, AKY
應用化學系
Department of Applied Chemistry
公開日期: 14-Jan-2003
摘要: A novel oxdiazole-containing polyfluorene copolymer (PF-OXD) was synthesized by attaching two electron-deficient, 4-tent-butylphenyl-1,3,4-oxadiazole groups onto the C-9 position of the alternating fluorene unit to form a 3-D cardo-structure. This polymer possesses a very high glass transition temperature (T-g: 213 degreesC) and very good thermal stability due to its rigid cardo-linkage. The results from the photoluminescence measurements of the isothermally heated PF-OXD thin film (150 degreesC for 20 h) show that the commonly observed aggregate/excimer formation in polyfluorenes is very effectively suppressed in this polymer due to its 3-D structure and high T-g. A double-layer LED device using this polymer as the emitting layer shows a bright blue emission with a low turn-on voltage at 5.3 V and a high brightness of 2770 cd/m(2) at a drive voltage of 10.8 V. The maximum external quantum efficiency is 0.52% at 537 cd/m(2) with a bias of 7.4 V. The improved device performance over that of poly(9,9-dioctylfluorene) (POF) may be due to better electron injection and transport in PF-OXD and the efficient energy transfer from the OXD side chain to the polyfluorene main chains.
URI: http://dx.doi.org/10.1021/cm020688+
http://hdl.handle.net/11536/28163
ISSN: 0897-4756
DOI: 10.1021/cm020688+
期刊: CHEMISTRY OF MATERIALS
Volume: 15
Issue: 1
起始頁: 269
結束頁: 274
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