State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, 163 Xianlin Street, Nanjing, 210023, P. R. China.
Angew Chem Int Ed Engl. 2023 May 22;62(22):e202301993. doi: 10.1002/anie.202301993. Epub 2023 Apr 19.
Room-temperature phosphorescence (RTP) polymers, whose emission can persist for a long period after photoexcitation, are of great importance for practical applications. Herein, dynamic covalent boronic ester linkages with internal B-N coordination are incorporated into a commercial epoxy matrix. The reversible dissociation of B-N bonds upon loading provides an efficient energy dissipation pathway for the epoxy network, while the rigid epoxy matrix can inhibit the quenching of triplet excitons in boronic esters. The obtained polymers exhibit enhanced mechanical toughness (12.26 MJ m ), ultralong RTP (τ=540.4 ms), and shape memory behavior. Notably, there is no apparent decrease in the RTP property upon prolonged immersion in various solvents because the networks are robust. Moreover, the dynamic bonds endow the polymers with superior reprocessablity and recyclability. These novel properties have led to their potential application for information encryption and anti-counterfeiting.
室温磷光（RTP）聚合物在光激发后可以长时间持续发射，对于实际应用非常重要。在此，将具有内部 B-N 配位的动态共价硼酸酯键合引入商业环氧树脂基体中。在负载下 B-N 键的可逆解离为环氧树脂网络提供了有效的能量耗散途径，而刚性的环氧树脂基体可以抑制硼酸酯中三重态激子的猝灭。所得到的聚合物表现出增强的机械韧性（12.26MJm）、超长的 RTP（τ=540.4ms）和形状记忆行为。值得注意的是，由于网络坚固，聚合物在长时间浸泡在各种溶剂中后，其 RTP 性能没有明显下降。此外，动态键赋予聚合物优异的再加工和可回收性。这些新特性使其在信息加密和防伪方面具有潜在的应用。
