https://scholars.lib.ntu.edu.tw/handle/123456789/342721
標題: | Decreased Turn-On Times of Single-Component Light-Emitting Electrochemical Cells by Tethering an Ionic Iridium Complex with Imidazolium Moieties | 作者: | Hai-Ching Su Hsiao-Fan Chen CHUNG-CHIH WU KEN-TSUNG WONG |
關鍵字: | Electrochemical cells; Electroluminescence; Ionic liquids; Iridium; Light-emitting devices | 公開日期: | 十一月-2008 | 卷: | 3 | 期: | 11 | 起(迄)頁: | 1922-1928 | 來源出版物: | Chemistry-An Asian Journal | 摘要: | We report a significant decrease in turn-on times of light-emitting electrochemical cells (LECs) by tethering imidazolium moieties onto a cationic Ir complex. The introduction of two imidazolium groups at the ends of the two alkyl side chains of [Ir(ppy)2(dC6-daf)]+(PF 6)- (ppy=2-phenylpyridine, dC6-daf=9,9′-dihexyl-4,5- diazafluorene) gave the complex [Ir(ppy)2(dC6MIM-daf)] 3+[(PF6)-]3 (dC6MIM-daf=9,9-bis[6- (3-methylimidazolium) hexyl]-1-yl-4,5-diazafluorene). Both complexes exhibited similar photoluminescent/electrochemical properties and comparable electroluminescent efficiencies. The turn-on times ofthe LECs based on the latter complex, however, were much lower than those of devices based on the former. The improvement is ascribed to increased concentrations of mobile counterions ((PF6)-) in the neat films and a consequent increase in neat-film ionic conductivity. These results demonstrate that the technique is useful for molecular modifications of ionic transition-metal complexes (ITMCs) to improve the turn-on times of LECs and to realize single-component ITMC LECs compatible with simple driving schemes. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/342721 https://www.scopus.com/inward/record.uri?eid=2-s2.0-55449121642&doi=10.1002%2fasia.200800020&partnerID=40&md5=2715ee27816993fad74004b993adf090 |
ISSN: | 18614728 | DOI: | 10.1002/asia.200800020 |
顯示於: | 電機工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。