Blue/deep-blue emission is crucial for organic optoelectronics but remains a formidable challenge in organic afterglow due to the difficulties in populating and stabilizing the high-energy triplet excited states. Here, a facile strategy to realize the efficient deep-blue organic afterglow is proposed via host molecules to sensitize the triplet exciton population of guest and water implement to suppress the non-radiative decays by matrices rigidification. A series of highly luminescent deep-blue (405–428 nm) organic afterglow materials with lifetimes up to 1.67 s and quantum yields of 46.1% are developed. With these high-performance water-responsive materials, lifetime-encrypted rewritable paper has been constructed for water-jet printing of high-resolution anti-counterfeiting patterns that can retain for a long time (>1 month) and be erased by dimethyl sulfoxide vapor in 15 min with high reversibility for many write/erase cycles. These results provide a foundation for the design of high-efficient blue/deep-blue organic afterglow and stimuli-responsive materials with remarkable applications.

蓝色/深蓝色发射对于有机光电子学至关重要，但由于难以填充和稳定高能三重激发态，因此在有机余辉中仍然是一个艰巨的挑战。在这里，提出了一种通过主体分子实现有效深蓝色有机余辉的简便策略，以敏化客体和水体的三重态激子群，以通过基质硬化抑制非辐射衰变。开发了一系列高发光深蓝色（405-428 nm）有机余辉材料，寿命可达1.67 s，量子产率为46.1%。借助这些高性能的水响应材料，构建了终生加密的可擦写纸，用于喷水打印可长时间保留的高分辨率防伪图案 (> 1 个月）并在 15 分钟内被二甲基亚砜蒸气擦除，对于许多写入/擦除循环具有高度可逆性。这些结果为设计具有显着应用的高效蓝色/深蓝色有机余辉和刺激响应材料提供了基础。