Decreased turn-on times of single-component light-emitting electrochemical cells by tethering an ionic iridium complex with imidazolium moieties

Hai-Ching Su, Hsiao Fan Chen, Chung Chih Wu*, Ken Tsung Wong

*此作品的通信作者

研究成果: Article同行評審

52 引文 斯高帕斯(Scopus)

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.

原文English
頁(從 - 到)1922-1928
頁數7
期刊Chemistry - An Asian Journal
3
發行號11
DOIs
出版狀態Published - 13 11月 2008

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