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

作　　者：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 

机构地区：[1]Centre for Molecular Systems and Organic Devices(CMSOD),State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials,Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing University of Posts&Telecommunications,Nanjing,Jiangsu,210023 China [2]Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials,School of Chemistry and Chemical Engineering,Huaiyin Normal University,Huai'an,Jiangsu,223300 China

出　　处：《Chinese Journal of Chemistry》2024年第11期1223-1229,共7页中国化学（英文版）

基　　金：supported by the Natural Science Foundation of Nanjing University of Posts and Telecommunications(NY222157,NY221085);State Key Laboratory of Organic Electronics and Information Display(GZR2022010008);Key Laboratory of Low-dimensional Materials Chemistry of Jiangsu Province(JSKC20022);General Program of China Postdoctoral Science Foundation(2022M711684);General Program of Basic Science(Natural Science)of Colleges and Universities of Jiangsu Province(22KJB430036);National Overseas Study Fund(202008320051);National Key Laboratory(2009DS690095);the National Natural Science Foundation of China(62288102).

摘　　要：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′-fluorene](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.

关 键 词：Organic semiconductor PHOTOOXIDATION Spirocyclic aromatic hydrocarbons Crystal engineering Fluorescence 

分 类 号：O657.3[理学—分析化学]