School of Materials Science and Engineering, Collaborative Innovation Center of Information Technology, Collaborative Innovation Center of Marine Science and Technology, Hainan University, No 58, Renmin Avenue, Haikou 570228, China.
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, No. 2699, Qianjin Avenue, Changchun 130012, China.
Molecules. 2023 Jun 16;28(12):4805. doi: 10.3390/molecules28124805.
The kinetic isotope effect (KIE) is beneficial to improve the performance of luminescent molecules and relevant light-emitting diodes. In this work, the influences of deuteration on the photophysical property and stability of luminescent radicals are investigated for the first time. Four deuterated radicals based on biphenylmethyl, triphenylmethyl, and deuterated carbazole were synthesized and sufficiently characterized. The deuterated radicals exhibited excellent redox stability, as well as improved thermal and photostability. The appropriate deuteration of relevant C-H bonds would effectively suppress the non-radiative process, resulting in the increase in photoluminescence quantum efficiency (PLQE). This research has demonstrated that the introduction of deuterium atoms could be an effective pathway to develop high-performance luminescent radicals.
动力学同位素效应（KIE）有利于提高发光分子及其相关发光二极管的性能。在这项工作中，首次研究了氘代对发光自由基光物理性质和稳定性的影响。合成并充分表征了基于联苯甲基、三苯甲基和氘代咔唑的四个氘代自由基。氘代自由基表现出优异的氧化还原稳定性，以及改善的热稳定性和光稳定性。相关 C-H 键的适当氘代可以有效抑制非辐射过程，从而提高光致发光量子效率（PLQE）。这项研究表明，引入氘原子可能是开发高性能发光自由基的有效途径。
