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Lanthanide Perovskite Heterostructures with Stabilized Dual-Mode Luminescence for Multilevel Information Encryption.

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  • 1Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China.

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Summary

Lanthanide double perovskites (Ln-DPs) achieve efficient dual-mode luminescence using a simple bilayer structure. This approach enhances upconversion and downshifting, enabling advanced optical coding and encryption applications.

Keywords:
dual-mode luminescenceheterostructurelanthanidelead-free perovskiteupconversionwater-stability

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Luminescence

Background:

  • Lanthanide double perovskites (Ln-DPs) exhibit tunable emission and low toxicity.
  • Weak crystal fields in Ln-DPs limit efficient upconversion luminescence and multimodal applications.
  • Conventional methods for dual-mode luminescence often involve complex core-shell architectures.

Purpose of the Study:

  • To demonstrate highly efficient dual-mode (upconversion and downshifting) emission from a simple bilayer heterostructure.
  • To overcome limitations of weak crystal fields in Ln-DPs for enhanced luminescence.
  • To explore applications in optical coding and information encryption.

Main Methods:

  • Synthesis of heterostructure nanocomposites of Ln-DPs using an optimized thermal injection approach.
  • Incorporation of NaLnF4 to enhance luminescence and structural stability via surface passivation.
  • Leveraging ion migration to optimize the crystal field for Er3+ ions.

Main Results:

  • Achieved highly efficient dual-mode emission from a simple bilayer heterostructure, contrasting with complex core-shell designs.
  • NaLnF4 incorporation enhanced Ln-DPs' intrinsic luminescence and structural stability.
  • Tunable upconversion luminescence was enabled through Er3+ self-absorption, with red emission intensity improved by a factor of 13.23.

Conclusions:

  • A simple bilayer heterostructure design provides a powerful strategy for high-performance Ln-DPs light-emitting devices.
  • The developed method overcomes the limitations of weak crystal fields in Ln-DPs.
  • The findings highlight potential applications in advanced optical coding and information encryption.