標題: Effects of incorporating salts with various alkyl chain lengths on carrier balance of light-emitting electrochemical cells
作者: Sun, Ray
Liao, Chih-Teng
Su, Hai-Ching
照明與能源光電研究所
Institute of Lighting and Energy Photonics
關鍵字: Light-emitting electrochemical cells;Salts;Carrier balance
公開日期: 1-十一月-2014
摘要: Recently, solid-state light-emitting electrochemical cells (LECs) have attracted much attention since they have advantages such as low operation voltages, simple device structure and balanced carrier injection. Salts are commonly added in the emissive layer of LECs to provide additional mobile ions and thus to accelerate device response. However, in addition to modified ionic property, carrier balance of LECs would also be tailored by salt additives. In this work, we improve device efficiency of LECs by incorporating imidazole-based salts bearing various alkyl chain lengths. As the alkyl chain length of the added salt increases, the device current decreases and the recombination zone approaches the anode. These results reveal that hole transport in the emissive layer of LEC containing a salt with a larger size would be impeded more significantly than electron transport. When doped with a salt possessing a proper size, nearly doubled device efficiency as compared to that of the neat-film device can be obtained due to improved carrier balance. This work demonstrates a feasible strategy to improve device performance of LECs and clarifies the physical insights of the effect of salt size on carrier balance of LECs. (C) 2014 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orge1.2014.08.031
http://hdl.handle.net/11536/123953
ISSN: 1566-1199
DOI: 10.1016/j.orge1.2014.08.031
期刊: ORGANIC ELECTRONICS
Volume: 15
Issue: 11
起始頁: 2885
結束頁: 2892
顯示於類別:期刊論文


文件中的檔案:

  1. 000344424500034.pdf