南京邮电大学黄维团队报道了光活化有机超长室温磷光的共振诱导动态三重态激子群。相关研究成果发表在2024年7月11日出版的《美国化学会杂志》。

在外部刺激下动态填充三重态激子是开发智能光电材料所需要的，但这仍然是一个艰巨的挑战。

该文中，研究人员报告了一种共振诱导激发态调控策略，通过在荧光粉中引入自适应的N-C═O结构来动态调节三重态激子群。所开发的荧光粉在高功率紫外线照射下活化，表现出增强的光活化有机超长室温磷光（PA-OURTP），寿命高达～500 ms。增强的PA-OURTP归因于活化的N-C═O共振变化引起的系统间交叉，从而产生过量的三重态激子。

研究人员所开发材料的优异PA-OURTP性能和在环境条件下的超长失活时间，可以作为可重复使用的记录介质，通过光学打印进行时间敏感信息加密。

该研究为动态调节三重态激子提供了一种有效的方法，并为开发用于安全印刷应用的高性能PA-OURTP材料提供了有价值的指导。

附：英文原文

Title: Resonance-Induced Dynamic Triplet Exciton Population for Photoactivated Organic Ultralong Room Temperature Phosphorescence

Author: Gaozhan Xie, Ningning Guo, Xudong Xue, Qianxiu Yang, Xiaolong Liu, Hui Li, Huanhuan Li, Ye Tao, Runfeng Chen, Wei Huang

Issue&Volume: July 11, 2024

Abstract: Dynamically populating triplet excitons under external stimuli is desired to develop smart optoelectronic materials, but it remains a formidable challenge. Herein, we report a resonance-induced excited state regulation strategy to dynamically modulate the triplet exciton population by introducing a self-adaptive N–C═O structure to phosphors. The developed phosphors activated under high-power ultraviolet irradiation exhibited enhanced photoactivated organic ultralong room temperature phosphorescence (PA-OURTP) with lifetimes of up to ～500 ms. The enhanced PA-OURTP was ascribed to activated N–C═O resonance variation-induced intersystem crossing to generate excess triplet excitons. The excellent PA-OURTP performance and ultralong deactivation time under ambient conditions of the developed materials could function as a reusable recorded medium for time-sensitive information encryption through optical printing. This study provides an effective approach to dynamically regulating triplet excitons and offers valuable guidance to develop high-performance PA-OURTP materials for security printing applications.

DOI: 10.1021/jacs.4c06577

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c06577