Switchable and Highly Robust Ultralong Room‐Temperature Phosphorescence from Polymer‐Based Transparent Films with Three‐Dimensional Covalent Networks for Erasable Light Printing
Jian‐An Li, Letian Zhang, Chunlei Wu, Zihao Huang, Shufeng Li, Huaqing Zhang, Qingchen Yang, Zhu Mao, Suilian Luo, Cong Liu, Guang Shi, Bingjia Xu
Abstract
In this work, an efficient polymer-based organic afterglow system, which shows reversible photochromism, switchable ultralong organic phosphorescence (UOP), and prominent water and chemical resistance simultaneously, has been developed for the first time. By doping phenoxazine (PXZ) and 10-ethyl-10H-phenoxazine (PXZEt) into epoxy polymers, the resulting [email protected] % and [email protected] % films show unique photoactivated UOP properties, with phosphorescence quantum yields and lifetimes up to 10.8 % and 845 ms, respectively. It is found that the steady-state luminescence and UOP of [email protected] % are switchable by light irradiation and thermal annealing. Moreover, the doped films can still produce conspicuous UOP after soaking in water, strong acid and base, and organic solvents for more than two weeks, exhibiting outstanding water and chemical resistance. Inspired by these exciting results, the [email protected] % has been successfully exploited as an erasable transparent film for light printing.