標題: Single-component polyfluorene electrolytes bearing different counterions for white light-emitting electrochemical cells
作者: Tsai, Chia-Sheng
Yang, Sheng-Hsiung
Liu, Bo-Cun
Su, Hai-Ching
照明與能源光電研究所
Institute of Lighting and Energy Photonics
關鍵字: Polyfluorene electrolytes;Counterions;Light-emitting electrochemical cells;Solid-state lighting
公開日期: 1-二月-2013
摘要: A series of polyfluorene (PF) electrolytes bearing Br, BF4-, or PF6- counterions were synthesized and characterized. 2,1,3-Benzoselenadiazole moieties were incorporated into polymer main chains to produce single-component white light-emitting polymers. The thermal stability of Br-containing ionic PF was decreased because of the Hofmann elimination occurred at higher temperature. By replacing Br with BF4- or PF6- counterions, the thermal stability of polymers was significantly improved. UV-vis absorption and photoluminescence spectra revealed that Br-containing ionic PF generates blue shift in methanol, while BF4 and PF6-containing ionic PFs show blue shift in acetonitrile. Electrochemical analysis revealed that oxidation potentials of BF4 and PF6-containing ionic PFs were decreased, resulting in increase in HOMO and LUMO levels. The optimized spin-coated light-emitting electrochemical cell (LEC) with the configuration of ITO/PEDOT/polymer/Ag showed a maximum luminescence efficiency of 1.56 lm/W at a low operation bias of 3 V. The single-component LEC device exhibited pure white light emission with CIE'1931 coordinates approaching (0.33, 0.33) and high color rendering index (CRI > 85), referring to its potential use in solid-state-lighting application. (C) 2012 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orgel.2012.11.029
http://hdl.handle.net/11536/21248
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2012.11.029
期刊: ORGANIC ELECTRONICS
Volume: 14
Issue: 2
起始頁: 488
結束頁: 499
顯示於類別:期刊論文


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