Ag Nanocluster-Enhanced Scintillation Properties of Borophosphate Glasses Doped with CsPbBr Quantum Dots.

A novel and effective method to improve scintillation properties of glass-ceramics, such as intensity enhancement and decay-time shortening, is reported in this work. Compared with crystal scintillators, glass scintillators always have the problems of low efficiency and long decay; how to solve them has always been a scientific puzzle in the field of scintillation glass-ceramics. The plasma enhancement effect can be predicted to solve the above problems. Ag ions were diffused into glasses by ion exchange, and then Ag nanoparticles and CsPbBr quantum dots were formed by heat treatment. The structure of the CsPbBr perovskite consists of a series of shared corner PbBr octahedra with Cs ions occupying the cuboctahedral cavities. By using Ag and the plasma resonance effect, the photoluminescence intensity of CsPbBr quantum dot glasses was enhanced by 3 times, its radioluminescence intensity increased by 6.25 times, and its decay time was reduced by a factor of more than one. Moreover, the mechanism of photoluminescence and radioluminescence enhanced by Ag and plasma was discussed based on the experimental results and finite-difference time-domain method. We concluded that the increase in radioluminescence intensity was related to plasma enhancements and the energy exchange between Ag nanoclusters and CsPbBr quantum dots. Doping Ag is a valid means to improve the scintillation luminescence of CsPbBr quantum dot glasses, which can be applied in the field of scintillation.