Liang Xiao, Zheng You-Xuan, Zuo Jing-Lin
State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.
Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Angew Chem Int Ed Engl. 2021 Jul 26;60(31):16984-16988. doi: 10.1002/anie.202106472. Epub 2021 Jun 24.
Organic long persistent luminescence (OLPL) materials with afterglow duration in the scale of minutes or even hours are still rare. Most OLPL systems are based on exciplexes, which require complicated multi-component system in order to realize white afterglow but with slightly compromised duration and color stability. In this work, OLPLs lasting from 20 to 40 minutes are realized in a simple binary system based on two-photon ionization mechanism, which can simultaneously harvest excitons from both singlet and triplet excited states, making it potentially one of the most promising candidates to achieve stable white OLPL. Through modulation and optimization of dopant molecules in dibenzo[b,d]thiophen-2-yldiphenyl phosphine oxide host, the emission profiles of afterglow can be readily tuned from cyan (0.19, 0.22), cold white (0.31, 0.35), standard white (0.33, 0.33) to warm white (0.31, 0.46), with excellent color consistency.
余辉持续时间在几分钟甚至几小时范围内的有机长余辉发光（OLPL）材料仍然很少见。大多数OLPL系统基于激基复合物，为了实现白色余辉，这需要复杂的多组分体系，但余辉持续时间和颜色稳定性会稍有折损。在这项工作中，基于双光子电离机制，在一个简单的二元体系中实现了持续20到40分钟的OLPL，该体系可以同时从单重态和三重态激发态收集激子，这使其有可能成为实现稳定白色OLPL最有前景的候选材料之一。通过对二苯并[b,d]噻吩-2-基二苯基氧化膦主体中掺杂分子的调控和优化，余辉的发射光谱可以很容易地从青色（0.19, 0.22）、冷白色（0.31, 0.35）、标准白色（0.33, 0.33）调整到暖白色（0.31, 0.46），具有出色的颜色一致性。
