標題: Highly efficient double-doped solid-state white light-emitting electrochemical cells
作者: Su, Hai-Ching
Chen, Hsiao-Fan
Shen, Yu-Chun
Liao, Chih-Teng
Wong, Ken-Tsung
照明與能源光電研究所
Institute of Lighting and Energy Photonics
公開日期: 2011
摘要: We report highly efficient, solid-state, white light-emitting electrochemical cells (LECs) based on a double-doped strategy, which judiciously introduces an orange-emitting guest, [Ir(ppy)(2)(dasb)](+)(PF(6)(-)), into a single-doped emissive layer comprised of an efficient blue-green emitting host, [Ir(dfppz)(2)(dtb-bpy)](+)(PF(6)(-)), and a red-emitting guest, [Ir(ppy)(2)(biq)](+)(PF(6)(-)), to improve the balance of carrier mobilities and, thus, to enhance the device efficiency. Photoluminescence (PL) measurements show that the single-doped (red guest) and the double-doped (red and orange guests) host-guest films exhibit similar white PL spectra and comparable photoluminescence quantum yields, while the device efficiencies of the double-doped white LECs are twofold higher than those of the single-doped white LECs. Therefore, such enhancement of the device efficiency is rationally attributed to the improved balance of carrier mobilities of the double-doped emissive layer. Peak external quantum efficiency and peak power efficiency of the double-doped white LECs reached 7.4% and 15 lm W(-1), respectively. These efficiencies are amongst the highest reported for solid-state white LECs and, thus, confirm that the double-doping strategy is useful for achieving highly efficient white LECs.
URI: http://hdl.handle.net/11536/26165
http://dx.doi.org/10.1039/c1jm10507h
ISSN: 0959-9428
DOI: 10.1039/c1jm10507h
期刊: JOURNAL OF MATERIALS CHEMISTRY
Volume: 21
Issue: 26
起始頁: 9653
結束頁: 9660
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