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Effects of substituents on luminescent efficiency of stable triaryl methyl radicals†
Physical Chemistry Chemical Physics ( IF 3.3 ) Pub Date : 2018-06-26 00:00:00 , DOI: 10.1039/c8cp01492b
Shengzhi Dong 1, 2, 3, 4, 5 , Wei Xu 2, 3, 5, 6, 7 , Haoqing Guo 1, 2, 3, 4, 5 , Wenfu Yan 2, 3, 5, 6, 7 , Ming Zhang 1, 2, 3, 4, 5 , Feng Li 1, 2, 3, 4, 5
Affiliation  

A series of perchlorotriphenyl methyl (PTM) and tris(2,4,6-trichlorophenyl)methyl (TTM) radical derivatives were synthesized. The factors affecting the photoluminescence quantum yields (PLQYs) of π-radicals were studied systematically for the first time through comparing the photophysical properties of the synthesized PTM and TTM radicals. The room-temperature PLQY of a PTM radical derivative achieves to be 56.6%, which is the highest value among the organic near-infrared materials with peak wavelength over 650 nm. The photostabilities of the radicals was significantly enhanced via incorporation of substituent groups. The molecular rigidity, electron donating ability of the donor and dihedral angle between D–A system were found to be the potential factors to affect the luminescent efficiency of the open-shell molecules.

中文翻译:

取代基对稳定的三芳基甲基自由基的发光效率的影响

合成了一系列的全氯三苯甲基(PTM)和三(2,4,6-三氯苯基)甲基(TTM)自由基衍生物。通过比较合成的PTM和TTM自由基的光物理性质,首次系统地研究了影响π自由基的光致发光量子产率(PLQYs)的因素。PTM自由基衍生物的室温PLQY达到56.6%,这是峰值波长超过650 nm的有机近红外材料中的最高值。自由基的光稳定性通过取代基的引入。发现分子刚性,施主的电子供体能力以及D–A系统之间的二面角是影响开壳分子发光效率的潜在因素。
更新日期:2018-06-26
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