Fluorescence Lifetime-Tunable Water-Resistant Perovskite Quantum Dots for Multidimensional Encryption

Abstract

Using temporal dimension in optical multiplexing is a promising method to increase the security of data encryption. However, adjusting the fluorescence lifetime of light-emitting material often results in inevitable changes in their fluorescence spectra, which is unfavorable for confidential information protection. Here, we report the preparation of various perovskite quantum dot/polymer nanospheres (PQD/polymer) with tunable and long fluorescence lifetimes but identical fluorescence spectra, which are ideal multidimensional data encryption materials. This new data encryption strategy utilizes the water sensitivity of perovskite and achieves spatial dimension encryption of information using different water stabilities between uncoated perovskite quantum dots and PQD/ polymer. The fluorescence lifetime of PQD/polymer is used as the coding element to achieve temporal dimension data encryption, and the data are decrypted by fluorescence lifetime imaging microscopy and time-gated luminescence imaging techniques. This study shows the potential of PQD/polymer as a new class of materials for advanced data encryption.

Design of two-dimensional halide perovskite composites for optoelectronic applications and beyond

“…The record of photoluminescence and electroluminescence efficiency 216 of 2D perovskites has continuously been broken in display, encryption, biological imaging and X-Ray detection. 52,217,218 For instance, Chandra et al 219 reported the use of specific antibody attached water-resistant CsPbBr 3 nanocrystals in different dimensions for two-photon imaging of breast cancer cells in the near IR region, superior to conventional organic fluorescence labels.…”

Highly Emissive Deep‐Red Perovskite Quantum Dots in Glass: Photoinduced Thermal Engineering and Applications

“…The fast‐decay component (τ 1 ) can be attributed to exciton recombination in the interior crystal, and the slow‐decay component (τ 2 ) can be attributed to the trap‐mediated exciton recombination. [ 46,47 ] As shown in Table S3, Supporting Information, τ 1 is ≈4–7 ns for the samples, and it is very close to that of colloid PQDs and shorter than that of PQDs in glass generated by traditional heat treatment, which confirms the high quality of interior crystals in the PQDs generated by ultrafast laser direct writing. [ 48–51 ] An increase in RF from 50 to 100 kHz results in a slight decrease in average lifetime τ ave with the proportion of τ 1 (τ 2 ) decreases (increases).…”

Progress of Backlight Devices: Emergence of Halide Perovskite Quantum Dots/Nanomaterials

“…To overcome the instability problem, several strategies were proposed, including doping (Liu et al, 2017), inorganic shell (Wang et al, 2018;Dirin et al, 2019), ligand passivation (Zhang et al, 2019;Lu et al, 2021;Min et al, 2022), polymer matrix (Liu et al, 2020b). Liu et al (2017) doped the aluminum into perovskite quantum dots and fabricated the white LED that displays 116% NTSC.…”