Carbazole-Dendronized Luminescent Radicals

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.

Automated summary

A series of carbazole-dendronized TTM radicals were synthesized and their photophysical properties were systematically compared up to the fourth generation to understand the evolution of structure-property relationships. It was found that the photoluminescence quantum yield (PLQY) increased with generation and the fourth generation (G4TTM) exhibited a high PLQY of 63% at 627 nm in cyclohexane solution. The dendron modification strategy also resulted in a blue-shift of the emission and improved photostability compared to the bare TTM radical.