近日，南京邮电大学Ling-Hai Xie及其团队提出了蓝色荧光发射器对抗光氧化诱导降解的位阻盔甲策略，这一研究成果发表在2024年2月6日出版的国际学术期刊《中国化学》上。

该研究团队采用结晶策略，使14H-螺[二苯并[c,h]吖啶-7,9'-芴] (SFDBA)紧密堆积，以抵抗氧化引起的荧光衰减。在这种情况下，SFDBA的惰性基团充当“位阻盔甲”，保护光敏基团不受氧气的攻击。因此，与SFDBA粉末在光照下2 h的荧光猝灭相比，SFDBA晶体在相同条件下可以保持8 h以上的荧光发射。此外，晶体薄膜的光致发光量子产率(PLQYs)比非晶薄膜高327%。这表明结晶策略是一种有效的抗氧化方法。

据介绍，抗氧稳定性是影响有机半导体器件性能的重要因素。提高光氧化稳定性可以延长器件的使用寿命，保持器件的机械性能和光电性能。一般来说，从分子结构到宏观器件水平的各种包封方法都可用来提高光氧化稳定性。

附：英文原文

Title: “Steric Armor” Strategy of Blue Fluorescent Emitters against Photooxidation-Induced Degradation

Author: Sha-Sha Wang, Jing-Rui Zhang, Kuan-De Wang, Hao-Ran Li, Peng-Hui Meng, Yang Zhou, Xiang Yu, Ying Wei, Quan-You Feng, Yu-He Kan, Ling-Hai Xie

Issue&Volume: 2024-02-06

Abstract: Stability against oxygen is an important factor affecting the performance of organic semiconductor devices. Improving photooxidation stability can prolong the service life of the device and maintain the mechanical and photoelectric properties of the device. Generally, various encapsulation methods from molecular structure to macroscopic device level are used to improve photooxidation stability. Here, we adopted a crystallization strategy to allow 14H-spiro[dibenzo[c,h]acridine-7,9′-uorene] (SFDBA) to pack tightly to resist fluorescence decay caused by oxidation. In this case, the inert group of SFDBA acts as a “steric armor”, protecting the photosensitive group from being attacked by oxygen. Therefore, compared with the fluorescence quenching of SFDBA powder under 2 h of sunlight, SFDBA crystal can maintain its fluorescence emission for more than 8 h under the same conditions. Furthermore, the photoluminescence quantum yields (PLQYs) of the crystalline film is 327% higher than that of the amorphous film. It shows that the crystallization strategy is an effective method to resist oxidation.

DOI: 10.1002/cjoc.202300638

Source: https://onlinelibrary.wiley.com/doi/10.1002/cjoc.202300638