State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Qianjin Avenue 2699, Changchun, 130012, P. R. China.
Phys Chem Chem Phys. 2018 Jul 11;20(27):18657-18662. doi: 10.1039/c8cp01492b.
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.
一系列高氯三苯甲基（PTM）和三（2,4,6-三氯苯基）甲基（TTM）自由基衍生物被合成出来。通过比较所合成的 PTM 和 TTM 自由基的光物理性质，首次系统地研究了影响π-自由基荧光量子产率（PLQY）的因素。一种 PTM 自由基衍生物在室温下的 PLQY 达到 56.6%，这是在峰值波长超过 650nm 的有机近红外材料中最高的值。通过引入取代基，自由基的光稳定性得到了显著提高。发现分子的刚性、给电子能力和 D-A 体系之间的二面角是影响开壳分子发光效率的潜在因素。
