Improved deep-red phosphorescence in cyclometalated iridium complexes via ancillary ligand modification
Improved deep-red phosphorescence in cyclometalated iridium complexes via ancillary ligand modification
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DOI：
10.1039/c9qi01584a
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发表时间：
2020-03-21
影响因子：
7
通讯作者：
Teets, Thomas S.
中科院分区：
文献类型：
--
作者：
Kabir, Evanta;Wu, Yanyu;Teets, Thomas S.
在这项工作中，我们描述了二环化铱配合物与有效的深红色发光。用两种不同的环化（（CN）-N-boolean AND）配体1-苯基异喹啉（piq）和2-（2-吡啶基）苯并噻吩（btp）与五种强π-辅助配体（（LX）-X-boolean AND）合成了一组九种新的配合物，通式为Ir（（CN）-N-boolean AND）（2）（（LX）-X-boolean AND）.通过在辅助配体上引入空间位阻取代基来实现深红色光致发光量子产率的改善，这可以提高辐射速率常数（k（r））和/或降低非辐射速率常数（k（nr））。五个配合物的特征在于通过X-射线晶体学，并通过深入的光谱和电化学测量研究了它们。
In this work, we describe bis-cyclometalated iridium complexes with efficient deep-red luminescence. Two different cyclometalating ((CN)-N-boolean AND) ligands-1-phenylisoquinoline (piq) and 2-(2-pyridyl)benzothiophene (btp)-are used with five strong pi-donating ancillary ligands ((LX)-X-boolean AND) to furnish a suite of nine new complexes with the general formula Ir((CN)-N-boolean AND)(2)((LX)-X-boolean AND). Improvements in deep-red photoluminescence quantum yields were accomplished by the incorporation of sterically encumbering substituents onto the ancillary ligand, which can enhance the radiative rate constant (k(r)) and/or reduce the non-radiative rate constant (k(nr)). Five of the complexes were characterized by X-ray crystallography, and all of them were investigated by in-depth spectroscopic and electrochemical measurements.