Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-Koen Kasuga-shi Fukuoka, 816-8580, Japan.
MOLFEX, Inc., Takano Nishibiraki-cho 34-4, Sakyo-ku, Kyoto, 606-8103, Japan.
Angew Chem Int Ed Engl. 2023 Jul 10;62(28):e202302550. doi: 10.1002/anie.202302550. Epub 2023 Apr 18.
A series of carbazole-dendronized tris(2,4,6-trichlorophenyl)methyl (TTM) radicals have been synthesized. The photophysical properties of dendronized radicals up to the fourth generation were compared systematically to understand how structure-property relationships evolve with generation. The photoluminescence quantum yield (PLQY) was found to increase with the increasing generation, and the fourth generation (G4TTM) in cyclohexane solution showed a PLQY as high as 63 % at a wavelength of 627 nm (in the deep-red region) from the doublet state. The dendron modification strategy also showed a blue-shift of the emission on increasing the generation number, and the photostability was also increased compared to the bare TTM radical.
一系列咔唑-树枝状三（2,4,6-三氯苯基）甲基（TTM）自由基已被合成。对树枝化自由基的光物理性质进行了系统的比较，以了解结构-性质关系如何随代际而演变。发现光致荧光量子产率（PLQY）随代的增加而增加，第四代（G4TTM）在环己烷溶液中在 627nm 处（在深红光区域）从双重态显示出高达 63%的 PLQY。与裸露的 TTM 自由基相比，树枝状修饰策略还显示出随着代际数的增加发射的蓝移，并且光稳定性也得到了提高。
