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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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Published on: October 1, 2019

Core-Shell Structured Upconversion/Lead-Free Perovskite Nanoparticles for Anticounterfeiting Applications.

Hui Xiao^1,2, Bin Liu³, Lei Qiu⁴

¹State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022, China.

Angewandte Chemie (International Ed. in English)

|December 17, 2021

Summary

This study introduces a novel dual optical encryption strategy for anticounterfeiting using a core-shell nanocomposite. The material exhibits tunable luminescence under different excitation sources, enhancing information security.

Keywords:

Lead-free materials Low-dimensional perovskites Luminescence Manganese Nanocomposites

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Inkjet Printing All Inorganic Halide Perovskite Inks for Photovoltaic Applications

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Published on: January 22, 2019

Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Nanocrystalline metal halide perovskites offer excellent luminescence for optoelectronic applications, including anticounterfeiting.
Current anticounterfeiting methods often require multiple optical modes for robust information security.
Developing advanced materials with multi-modal optical properties is crucial for enhanced security.

Purpose of the Study:

To develop an efficient dual optical encryption strategy for anticounterfeiting applications.
To create a novel core-shell nanocomposite exhibiting tunable luminescence.
To enhance the security and reliability of anticounterfeiting materials.

Main Methods:

Fabrication of a core-shell nanocomposite using NaYF4:Er3+,Yb3+ as the core and CsMnCl3 as the shell.
Utilizing dual luminescence properties: upconversion and downconversion.
Investigating the effect of excitation source (980 nm laser and UV light) on luminescence emission and color.

Main Results:

The synthesized nanocomposite demonstrated dual optical encryption capabilities.
Emission color and luminescent patterns were successfully tuned by altering the excitation source and penetration depth.
The material exhibited distinct luminescent responses to different incident radiations, enabling unique encryption patterns.

Conclusions:

The developed core-shell nanocomposite provides an efficient dual optical encryption strategy for anticounterfeiting.
The tunable luminescence based on excitation source offers a novel approach to enhance anticounterfeiting security.
This technology has the potential for fabricating advanced, professional anticounterfeiting materials.