Phenyl Derivatives Modulate the Luminescent Properties and Stability of CzBTM-Type Radicals

oleh: Quanquan Gou, Jiahao Guan, Lintao Zhang, Xin Ai

Format: Article
Diterbitkan: MDPI AG 2024-06-01

Deskripsi

The distinctive electron structures of luminescent radicals offer considerable potential for a diverse array of applications. Up to now, the luminescent properties of radicals have been modulated through the introduction of electron-donating substituents, predominantly derivatives of carbazole and polyaromatic amines with more and more complicated structures and redshifted luminescent spectra. Herein, four kinds of (<i>N</i>-carbazolyl)bis(2,4,6-tirchlorophenyl)-methyl (CzBTM) radicals, <b>Ph<sub>2</sub>CzBTM</b>, <b>Mes<sub>2</sub>CzBTM</b>, <b>Ph<sub>2</sub>PyIDBTM</b>, and <b>Mes<sub>2</sub>PyIDBTM</b>, were synthesized and characterized by introducing simple phenyl and 2,4,6-trimethylphenyl groups to CzBTM and PyIDBTM. These radicals exhibit rare blueshifted emission spectra compared to their parent radicals. Furthermore, modifications to CzBTM significantly enhanced the photoluminescence quantum yields (PLQYs), with a highest PLQY of 21% for <b>Mes<sub>2</sub>CzBTM</b> among CzBTM-type radicals. Additionally, the molecular structures, photophysical properties of molecular orbitals, and stability of the four radicals were systematically investigated. This study provides a novel strategy for tuning the luminescent color of radicals to shorter wavelengths and improving thermostability.