双光子电离诱导的稳定白色有机长余辉，这一成果由南京大学化学化工学院Jing-Lin Zuo小组经过不懈努力而取得。2021年6月4日出版的《德国应用化学》杂志发表了这一最新研究成果。

据介绍，余辉持续时间在分钟级甚至是小时级的有机长余辉材料（OLPL）仍然很少见。大多数OLPL系统都是基于复合物，需要复杂的多组分系统才能实现持续时间和颜色稳定性稍差的白光余辉。

在本研究中，课题组利用一个基于双光子电离机制的简单二元系统实现了持续20-40分钟的OLPL，该系统可以同时从单态和三重态激发态捕获激子，使其成为最有可能实现稳定的白色OLPL的候选材料。通过对二苯并[b,d]噻吩-2-基二苯基氧化膦基体中掺杂剂结构的调制和优化，余辉的发射曲线可以从青色(0.19,0.22)、冷白色(0.31,0.35)、标准白色(0.33,0.33)到暖白色(0.31,0.46)，具有良好的色一致性。

附：英文原文

Title: Two-Photon Ionization Induced Stable White Organic Long Persistent Luminescence

Author: Xiao Liang, You-Xuan Zheng, Jing-Lin Zuo

Issue&Volume: 2021-06-04

Abstract: 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 with slightly compromised duration and color stability. In this work, OLPLs lasting from 20 to 40 minutes are realized with a simple binary system based on two-photon ionization mechanism, which can harvest simultaneously excitons from both singlet and triplet excited states, making it potentially the most promising candidate to achieve stable white OLPL. Through modulation and optimization of dopant structures 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.

DOI: 10.1002/anie.202106472

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202106472