Please use this identifier to cite or link to this item: https://doi.org/10.1021/acsami.1c14071
Title: Perovskite Nanocrystals with Tunable Fluorescent Intensity during Anion Exchange for Dynamic Optical Encryption
Authors: Liu, Yang 
Zhang, Yong 
Keywords: perovskite
nanocrystals
dynamic encryption
capping ligands
ion exchange
Issue Date: 28-Sep-2021
Publisher: AMER CHEMICAL SOC
Citation: Liu, Yang, Zhang, Yong (2021-09-28). Perovskite Nanocrystals with Tunable Fluorescent Intensity during Anion Exchange for Dynamic Optical Encryption. ACS APPLIED MATERIALS & INTERFACES 13 (39) : 47072-47080. ScholarBank@NUS Repository. https://doi.org/10.1021/acsami.1c14071
Abstract: Perovskite nanocrystals (PNCs) have demonstrated their potential use in many applications such as optical encryption because of their excellent optical properties. However, the optical encryption using PNCs is mainly based on the formation of static patterns with luminescence on/off switching. In this work, we demonstrated that the capping ligands play an important role in tuning the luminescence intensity of the PNCs during ion exchange. The surfactant, oleylamine (OAm), is essential in shifting the luminescence color of the PNCs from green to yellow during the ion exchange. In the absence of OAm, the luminescence in the green and yellow regions is quenched during the ion exchange and the luminescence is recovered in the red region by adding trioctylphosphine (TOP) into the ion-exchange solution. On the basis of these findings, we proposed a dynamic optical encryption strategy using PNCs with different capping ligands by tuning the luminescence intensity. The encoded message is hidden in the green pattern at the beginning, shown during the ion exchange, and erased when the pattern is completely converted from a green color to a red color after the ion exchange ends. This dynamic encryption strategy enhances the security level and is compatible with human eye-perceivable patterns and binary coding algorithms.
Source Title: ACS APPLIED MATERIALS & INTERFACES
URI: https://scholarbank.nus.edu.sg/handle/10635/227583
ISSN: 1944-8244
1944-8252
DOI: 10.1021/acsami.1c14071
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