Crystallization-induced phosphorescence of benzils at room temperature  

作　　者：GONG YongYang TAN YeQiang LI Hong ZHANG YiRen YUAN WangZhang ZHANG YongMing SUN JingZhi TANG Ben Zhong 

机构地区：[1]School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University [2]Department of Polymer Science and Engineering,Zhejiang University [3]Department of Chemistry,The Hong Kong University of Science & Technology [4]HKUST Shenzhen Research Institute

出　　处：《Science China Chemistry》2013年第9期1183-1186,共4页中国科学（化学英文版）

基　　金：the National Natural Science Foundations of China (21104044);the National Basic Research Program of China (973 Program, 2013CB834701 and 2013CB834704);the Ph.D. Programs Foundation of Ministry of Education of China (20110073120040);the Shanghai Leading Academic Discipline Project (B202). W.Z.Y. thanks the Start-up Foundation and SMC-Chenxing Young Scholar Pro- gram of Shanghai Jiao Tong University.

摘　　要：Efficient room temperature phosphorescence (RTP) is rarely observed in pure organic luminogens. However, we have newly observed that benzil and its derivatives are nonluminescent in solvents and thin layer chromatography (TLC) plates, but become highly phosphorescent in crystal state at room temperature, exhibiting typical crystallization-induced phosphorescence (CIP) characteristics. The CIP phenomenon is ascribed to the restriction of intramolecular rotations in crystals owing to effective intermolecular interactions. Such intermolecular interactions greatly rigidify the molecular conformation and significantly decrease the nonradiative deactivation channels of the triplet excitons, thus giving boosted phosphorescent emission at room temperature.Efficient room temperature phosphorescence （RTP） is rarely observed in pure organic luminogens. However, we have newly observed that benzil and its derivatives are nonluminescent in solvents and thin layer chromatography （TLC） plates, but become highly phosphorescent in crystal state at room temperature, exhibiting typical crystallization-induced phosphorescence （CIP） characteristics. The CIP phenomenon is ascribed to the restriction of intramolecular rotations in crystals owing to effective intermolecular interactions. Such intermolecular interactions greatly rigidify the molecular conformation and significantly decrease the nonradiative deactivation channels of the triplet excitons, thus giving boosted phosphorescent emission at room temperature.

关 键 词：crystallization-induced phosphorescence room temperature phosphorescence BENZILS intermolecular interactions 

分 类 号：O625.6[理学—有机化学]