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: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University,Department of Polymer Sc
• 出 处: 中国科学:化学
• 发表日期: 2013年09期
• 关键词: intermolecular intramolecular conformation giving carbonyl ambient aromatic comp

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. If you 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. CIP phenomenon is ascribed to the restriction of intramolecular rotations in the phasing of the intramolecular interactions to make effective intermolecular interactions. Shuch intermolecular interactions greatly rigid the molecular conformation and significantly decrease the nonradiative deactivation channels of the triplet excitons, thus giving boosted phosphorescent emission at room temperature.