Boron Nitride Dots In-Situ Embedded In A B2o3 Matrix With The Long Lifetime Room-Temperature Phosphorescence In Dry And Wet States

Developing metal-free room-temperature phosphorescence (RTP) materials with ultralong lifetimes in dry and wet states simultaneously has been widely concerned due to their potential applications, which is also a tough challenge up to now. Herein, a smart construction strategy is proposed to in-situ embed boron nitride dots (BNDs) into an isogenous B2O3 matrix. The BND-based materials exhibit unexpected bluish-green RTP in solid and various wet conditions (water, oxidants, organic solvents, strong acids and bases). The RTP lifetime of them in powder is as long as similar to 1.7 s, lasting over 10 s to naked eye. B2O3 matrix can not only uniformly disperse the BNDs in it, but also provide a rigid environment via forming hydrogen-bonded and covalently bonded interactions between them to strongly stabilize the triplet states excitions on the dots from nonradiative deactivation. More interestingly, RTP quenching of the BND-based powder in various solutions is effectively suppressed because the B2O3 matrix is not collapsed in them. For instance, the RTP lifetime in water is as long as similar to 0.9 s. Based on the distinctive RTP properties in dry and various harsh wet states, the applications of the BND-based RTP materials in multi-level anti-counterfeiting and information encryption are demonstrated.