Multicolor emitting from a single component emitter: New iridium(III) complexes with ancillary ligand 2-(2-hydroxyphenyl) benzothiazole

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• 作者：Yuying Hao ; Xiaoxia Guo ; Liping Lei ; Jianning Yu ; Huixia Xu ; Bingshe Xu
• 关键词：Iridium(III) complexes ; Multicolor emitting ; Single component
• 刊名：Synthetic Metals
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：160
• 期：11-12
• 页码：1210-1215
• 全文大小：502 K

文摘

Four new types of Ir(III) complexes (ppy)₂Ir(LX) (ppy = 2-phenylpyridine, LX = BTZ, 3-MeBTZ, 4-MeBTZ, and 4-TfmBTZ) were synthesized and investigated by optical spectroscopy, electrochemistry as well as density functional theory (DFT). These complexes all exhibit multi-emission bands under ultraviolet light excitation at room temperature because there are efficient energy transfers between different excited states (¹LC, ¹MLCT, ¹ILCT, ³MLCT, ³ILCT), especially for complexes I–III. The blue emitting relates to the fluorescence of Ir(R-BTZ) and the green emission originates in ³MLCT emission of Ir(ppy)₂ fragment. The red emission corresponds to ³ILCT transition (R-BTZ → ppy) for complexes I–III, but ³MLCT transition of Ir(4-TfmBTZ)₂ fragment for (ppy)₂Ir(4-TfmBTZ). The red emission peak wavelength can be fine-tuned from 583 to 626 nm by the electron withdrawing or donating substituent at 3- or 4-position of BTZ ligand. For these single component complexes with multicolor emitting, a very promising application is the generation of white light. Although these complexes span non-uniformly the spectral range of the visible region and consequently are insufficient to produce satisfactory white light characteristics, the luminescence mechanism of them provides a new strategy for designing organic white light-emitting material.