In recent years, femtosecond (fs) laser direct writing has been shown to be an effective way to induce local crystallization of perovskite quantum dots (PeQDs) within glass matrix. However, an additional heat treatment is necessary to promote the growth of the QDs and induce their luminescence, which to some extent brings inconvenience to the operation and affects their practical application.
To address these concerns, the research team report that CsPb(Cl/Br)3 PeQDs can be generated or erased in specially designed transparent glass via fs laser printing without the requirement of heat-treatment. More importantly, humidity is found to be able to induce spontaneous recovery of PeQDs decomposed by laser irradiation. By placing the laser-erased glass in the air for a certain time, photoluminescence in the erased region can be recovered without further heat-treatment, achieving reversible cryptographic reading and repeatable erasing/refreshing of multimodal information encryption.
The research findings, titled “Humidity-induced reversible crystallization of laser-printing perovskite quantum dots in glass,” have been published in Laser & Photonics Reviews, a journal in the field of physics. FNU is the first affiliation of the paper, with Xiao Han, a postgraduate of FNU, as the first author and professor Chen Daqin as the corresponding author.
Official website link: https://doi.org/10.1002/lpor.202300705
(Translated by Zou Chenxin/ Reviewed by Xie Xiujuan)