期刊
SCIENCE CHINA-CHEMISTRY
卷 56, 期 9, 页码 1183-1186出版社
SCIENCE PRESS
DOI: 10.1007/s11426-013-4930-9
关键词
crystallization-induced phosphorescence; room temperature phosphorescence; benzils; intermolecular interactions
资金
- National Natural Science Foundations of China [21104044]
- National Basic Research Program of China (973 Program) [2013CB834701, 2013CB834704]
- Ph.D. Programs Foundation of Ministry of Education of China [20110073120040]
- Shanghai Leading Academic Discipline Project [B202]
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.
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