Ag Nanocluster-Enhanced Scintillation Properties of Borophosphate Glasses Doped with CsPbBr3 Quantum Dots

Abstract

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 CsPbBr3 quantum dots were formed by heat treatment. The structure of the CsPbBr3 perovskite consists of a series of shared corner PbBr6 octahedra with Cs ions occupying the cuboctahedral cavities. By using Ag and the plasma resonance effect, the photoluminescence intensity of CsPbBr3 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 CsPbBr3 quantum dots. Doping Ag is a valid means to improve the scintillation luminescence of CsPbBr3 quantum dot glasses, which can be applied in the field of scintillation.

All‐Inorganic Glass Scintillators: Scintillation Mechanism, Materials, and Applications

“…Due to the plasma enhancement effect, the luminous intensity of quantum dots is increased by 6.25 times. [ 100 ] Eu was doped into borosilicate glass, which optimized the crystallization of quantum dots, thus significantly improving the imaging resolution. [ 21 ] In order to shorten the decay time, a high refractive index borosilicate glass matrix was employed, which effectively improved the radiation recombination rate of nanocrystals and reduced the decay time to 15.2 ns.…”

“…Du et al diffused Ag + into the borophosphate CsPbBr 3 quantum dot glass, reducing the decay time to half of the original value (Figure 7b). [ 100 ] Recently, several groups have conducted researches on long‐term stability. [ 72,99,108,109 ] Among them, CsPbBr 3 nanocrystals borosilicate glass showed excellent stability to water and heat, while CdS quantum dot embedded borosilicate glass ceramics also exhibited good irradiation stability, moisture and heat resistance.…”

“…Reproduced with permission. [ 100 ] Copyright 2022, MDPI (Basel, Switzerland). c) Photographs of CsPbBr 3 glass ceramic, CsPbBr 3 :1.5%Eu glass ceramic (optimal concentration of Eu dopant) and conventional CsPbBr 3 nanocrystal film with thickness of about 100 µm (CsPbBr 3 nanocrystals and polystyrene are uniformly mixed with the ratio of 1:5).…”

“…Du et al diffused Ag + into the borophosphate CsPbBr 3 quantum dot glass, reducing the decay time to half of the original value (Figure 7b). [100] Recently, several groups have conducted Solid line shows data for the PbO-B 2 O 3 system and that the ternary system yields glasses of superior density. Reproduced with permission.…”

Ag Nanoparticles Optimized the Optical Properties and Stability of CsPbBrI2 Glass for High Quality Backlight Display

“…Chen et al added Ag into borophosphate glass. The PL intensity of CsPbBr 3 quantum dot glass was increased by 3 times, and its radioluminescence intensity was increased by 6.25 times . Numerous studies have demonstrated that the incorporation of noble metal nanoparticles into glass systems can realize the excitation of plasmons, resulting in a localized surface plasmon resonance effect (LSPR). − As noble metal nanoparticles aggregate, their localized surface plasmon resonances become mutually coupled, leading to the emergence of the Purcell effect .…”