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Erasable Cs4PbBr6 quantum dots glass with switchable photoluminescence

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Abstract

Encapsulating quantum dots (QDs) into a transparent glass matrix can not only increase their stability but also explore new luminescence properties. Herein, erasable ${\rm{C}}{{\rm{s}}_4}{\rm{PbB}}{{\rm{r}}_6}$ QDs with switchable photoluminescence are successfully obtained by a heat-treatment method in a borosilicate glass matrix. First, QDs can self-crystalize in borosilicate glass without the heat treatment. Second, it is found that when the QDs glass is heat treated below ${{\rm{T}}_g}$, QDs can be destroyed. Further, when the QDs glass is reheat treated above ${{\rm{T}}_g}$, atom rearrangement can occur and QDs can reprecipitate in the glass matrix. Consequently, the switchable photoluminescence of QDs can be achieved. The special erasable QDs glass and switchable photoluminescence in this work can resolve the technological challenge of recovering the luminescence performance of QDs after they have been destroyed.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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