Extremely simple phenothiazine molecules with room-temperature phosphorescence for understanding mechanoluminescence excitation process

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 641-642
• 页数: 2页
• 语种: 英文

摘要

Mechanoluminescence (ML) is a light-emitting process induced by mechanical stimuli and has attracted ever increasing attention due to its potential applications in displays, lighting, bio-imaging and pressure sensing[1, 2].On the other hand, room-temperature phosphorescent (RTP) materials are attractive because of their multidisciplinary applications in electronics, optics, and biological areas[3].The development of organic ML luminogens with RTP properties is very important but extremely challenging because of a lack of reliable guidance, the unclear inherent mechanisms for ML excitation process, and the weakness of pin-orbit coupling and the sensitivity of triplet excitons.Bright organic ML luminogens, especially the rarely reported mechanophosphorescent ones, are very important for stud-ying the ML excitation process.In 2016, Prof.Li's group[4]at Wuhan University observed mechanophosphorescence in an organic luminogen DPP-BO (Figure 1) at room temperature, demonstrating the existence of an excited triplet state in the ML process, which is an important step towards organic mechanophosphorescence luminogens.