Cui Jiaying, Ali Syed Husnain, Shen Zhuoyao, Xu Wensheng, Liu Jiayi, Li Pengxiang, Li Yang, Chen Ligong, Wang Bowei
School of Chemical Engineering and Technology, Tianjin University Tianjin 300350 P. R. China
Tianjin Engineering Research Center of Functional Fine Chemicals Tianjin 300350 P.R. China.
Chem Sci. 2024 Feb 4;15(11):4171-4178. doi: 10.1039/d3sc06271f. eCollection 2024 Mar 13.
Achieving long-lived room-temperature phosphorescence from pure organic amorphous polymers is attractive, and afterglow materials with colour-tunable and multiple-stimuli-responsive afterglow are particularly important, but only few materials with these characteristics have been reported so far. Herein, a facile and general method is reported to construct a series of ε-polylysine (ε-PL)-based afterglow materials with tunable colour (from blue to red) and long life. By doping guest molecules into ε-PL to obtain composite materials, the polymer matrix provides a rigid environment for luminescent groups, resulting in amorphous polymers with different RTPs. In this system, the materials even have impressive humidity-stimulated responses, and the phosphorescence emission exhibits excitation-dependent and time-dependent properties. The humidity-responsive afterglow is caused by the destruction of hydrogen bonds and quenching of triplet excitons. The time-dependent afterglow should stem from the formation of diversified RTP emissive species with comparable but different lifetimes. 9,10-diaminophene has Ex-De properties in the film doping state. With the change of excitation wavelength (254 nm to 365 nm), the emission wavelength shifts from 461 nm to 530 nm, accompanied by the change of emission colour from blue to green. In addition, the phosphorescence life of the film is the longest, up to 2504.7 ms, and the afterglow lasts up to 15 s, which is conducive to its applications in anti-counterfeiting and information encryption.
从纯有机无定形聚合物中实现长寿命室温磷光很有吸引力，具有颜色可调谐和多刺激响应余辉的余辉材料尤为重要，但迄今为止只有少数具有这些特性的材料被报道。在此，报道了一种简便通用的方法来构建一系列基于ε-聚赖氨酸（ε-PL）的余辉材料，其具有可调谐颜色（从蓝色到红色）和长寿命。通过将客体分子掺杂到ε-PL中以获得复合材料，聚合物基质为发光基团提供了刚性环境，从而产生具有不同室温磷光的无定形聚合物。在该体系中，材料甚至具有令人印象深刻的湿度刺激响应，并且磷光发射表现出激发依赖性和时间依赖性特性。湿度响应余辉是由氢键的破坏和三重态激子的猝灭引起的。时间依赖性余辉应源于形成具有可比但不同寿命的多种室温磷光发射物种。9,10-二氨基菲在薄膜掺杂状态下具有激发-延迟特性。随着激发波长（254 nm至365 nm）的变化，发射波长从461 nm移至530 nm，同时发射颜色从蓝色变为绿色。此外，该薄膜的磷光寿命最长，可达2504.7 ms，余辉持续时间长达15 s，这有利于其在防伪和信息加密方面的应用。
