標題: Efficient and color-stable solid-state white light-emitting electrochemical cells employing red color conversion layers
作者: Wu, Hung-Bao
Chen, Hsiao-Fan
Liao, Chih-Teng
Su, Hai-Ching
Wong, Ken-Tsung
照明與能源光電研究所
Institute of Lighting and Energy Photonics
關鍵字: Light-emitting electrochemical cells;Color conversion layer;White light
公開日期: 1-三月-2012
摘要: We report efficient and color-stable white light-emitting electrochemical cells (LECs) by combining single-layered blue-emitting LECs with red-emitting color conversion layers (CCLs) on the inverse side of the glass substrate. By judicious choosing of the red-emitting dye doped in CCLs, good spectral overlap between the absorption spectrum of the red-emitting dye and the emission spectrum of the blue-emitting emissive material results in efficient energy transfer and thus sufficient down-converted red emission at low doping concentrations of the red-emitting dye in the CCLs. Low doping concentration is beneficial in reducing self-quenching of the red-emitting dye, rendering efficient red emission. Electroluminescent (EL) measurements show that the peak external quantum efficiency and the peak power efficiency of the white LECs employing red CCLs reach 5.93% and 15.34 lmW (1), respectively, which are among the highest reported for white LECs. Furthermore, these devices exhibit bias-insensitive white EL spectra, which are required for practical applications, due to nondoped emissive layers. These results reveal that single-layered blue-emitting LECs combined with red-emitting CCLs are one of the potential candidates for efficient and color-stable white light-emitting devices. (C) 2011 Elsevier B. V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orgel.2011.12.011
http://hdl.handle.net/11536/15585
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2011.12.011
期刊: ORGANIC ELECTRONICS
Volume: 13
Issue: 3
起始頁: 483
結束頁: 490
顯示於類別:期刊論文


文件中的檔案:

  1. 000300392100019.pdf