Emissive Iridium(III) Diimine Complexes Formed by Double Cyclometalation of Coordinated Triphenylphosphite

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• 作者：Yao-Yuan Chang ; Jui-Yi Hung ; Yun Chi ; Jong-Pyng Chyn ; Min-Wen Chung ; Chia-Li Lin ; Pi-Tai Chou ; Gene-Hsiang Lee ; Chih-Hao Chang ; Wei-Chieh Lin
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：June 6, 2011
• 年：2011
• 卷：50
• 期：11
• 页码：5075-5084
• 全文大小：1156K
• 年卷期：v.50,no.11(June 6, 2011)
• ISSN：1520-510X

文摘

We report on the synthesis of a new series of iridium(III) complexes functionalized with various diimine chromophores, together with a facially coordinated dicyclometalated phosphite chelate and a monodentate anionic ancillary. This conceptual design presents a novel strategy in obtaining a new class of iridium(III) diimine complexes without employment of traditional nitrogen-containing polyaromatic cyclometalates. Additionally, we discuss the basic charactersistics of the ground and lower-lying excited states involved, as documented by crystal structural, photophysical studies, and density functional theory calculations. Fabrication of the green-emitting organic light-emitting diodes with one such dopant, [Ir(dbbpy)(tpit)NCS] (2b), where dbbpy and tpit represent di-tert-butyl-2,2鈥?bipyridine and dicyclometalated triphenylphosphite, respectively, was successfully made, attaining a peak external quantum efficiency (畏_ext), a luminance efficiency (畏_l), and a power efficiency (畏_p) of 14.1%, 46.6 cd A^鈥?, and 39.9 lm W^鈥?, respectively.