吉林大学化学学院杨兵研究组揭示了利用噻吩取代基效应改善纯有机室温磷光。相关论文于2025年3月17日发表在《中国化学》杂志上。

为了深入了解噻蒽（TA）的潜力，系统研究了其取代基对室温磷光（RTP）性质的影响，包括TA的1位给电子取代基和2位吸电子取代基。理论和实验研究均表明，2位吸电子取代基比1位取代基显著提高了RTP性能，而给电子取代基则恰恰相反。与1位取代基相比，2位吸电子取代基的RTP辐射率较高，非辐射率较低，有利于RTP效率的提高。

此外，在2位取代中引入苯基极大地抑制了非辐射，从而同时提高了RTP效率和延长了寿命。最后，对这些RTP材料进行主题化，实现了信息的动态可逆操作（写-读-擦），以及加密和随时间的解密演示。本研究不仅对TA基RTP材料的结构-性能关系有了更深入的了解，而且为提高纯有机RTP材料的性能提供了分子内结构改性策略。

附：英文原文

Title: Improving Pure Organic Room-Temperature Phosphorescence by Substituent Effect of Thianthrene

Author: Zhe Feng, Zhiqiang Yang, Shuaiqiang Zhao, Junjie Qian, Shi-Tong Zhang, Haichao Liu, Bing Yang

Issue&Volume: 2025-03-17

Abstract: To gain insights into the potential of thianthrene (TA), its substituent effects were systematically studied on the room-temperature phosphorescence (RTP) properties, including the electron-donating and electron-withdrawing substituents at 1- and 2-positions of TA, respectively. Both theoretical and experimental investigations show that the 2-position electron-withdrawing substituents greatly enhance RTP performance than the 1-position substituents, while the situation is exactly the opposite for electron-donating substituents. Compared with the 1-position substitution, the 2-position electron-withdrawing substituents induce the higher RTP radiation rate and lower non-radiation rate, in favor of the enhancement of RTP efficiency. Furthermore, the introduction of phenylene into the 2-position substitution greatly suppresses the non-radiation, resulting in the simultaneously improved RTP efficiency and elongated lifetime. Finally, using these RTP materials, the dynamically reversible operations of information (write-read-erase) are realized, as well as the encryption and time-dependent decryption demonstration. This work not only provides a better understanding of structure–property relationship on TA-based RTP materials, but also suggests an intramolecular structural modification strategy to improve the performance of pure organic RTP materials.

DOI: 10.1002/cjoc.202500024

Source: https://onlinelibrary.wiley.com/doi/full/10.1002/cjoc.202500024