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长余辉发光材料在激发源停止激发后,仍然能够持续发光[1],在弱光照明、应急指示、建筑节能、智能交通、信息存储和显示等领域,特别是能在“免激发”条件下实现生物传感和成像以及多重数据加密和防伪方面,具有广泛的应用前景。与无机长余辉材料的悠久历史和如火如荼的研究现状相比,有机长余辉材料的发展甚晚,这是因为有机分子的激发态高度活泼,辐射和非辐射跃迁、激子转化和迁移、能量传输和转移等多种过程并存[2—4],激发态寿命
The long afterglow luminescent material can still continue to emit light after the excitation source ceases to be excited [1], especially in the field of low light illumination, emergency indication, building energy saving, intelligent transportation, information storage and display, Under the conditions of biosensing and imaging as well as multiple data encryption and security, with a wide range of applications. Compared to the long history of inorganic long afterglow materials and the state of the art research in full swing, the development of organic long afterglow materials is very late because of the highly active excited states of organic molecules, radiation and non-radiation transitions, exciton transformation and migration, energy transfer And transfer and other processes co-exist [2-4], excited state life expectancy