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Updated: Jul 31, 2025

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New Strategy: Molten Salt-Assisted Synthesis to Enhance Lanthanide Upconversion Luminescence.

Pengye Du1,2, Pengpeng Lei1, Yuan Liang1,3

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

Small (Weinheim an Der Bergstrasse, Germany)
|May 10, 2023
PubMed
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A novel molten salt-assisted synthesis method significantly enhances lanthanide-doped upconversion luminescent materials (LUCMs). This approach overcomes previous limitations, boosting luminescence intensity for improved applications.

Area of Science:

  • Materials Science
  • Luminescence
  • Nanotechnology

Background:

  • Lanthanide-doped upconversion luminescent materials (LUCMs) offer unique properties but suffer from low luminescence intensity and efficiency.
  • Existing enhancement strategies often have implementation drawbacks, hindering LUCM development.

Purpose of the Study:

  • To introduce a novel and simple molten salt-assisted synthesis strategy for enhancing lanthanide upconversion luminescence.
  • To demonstrate the effectiveness of this method in improving the luminescence intensity of rare earth oxides.

Main Methods:

  • A one-step molten salt-assisted synthesis using molten NaCl as reaction media and rare earth chlorides as precursors.
  • Systematic investigation of enhancement factors at varying reaction temperatures, using Yb3+/Er3+ co-doped Y2O3 as a model system.
Keywords:
enhanced luminescencemolten saltsrare earthupconversionupconversion white light-emitting diodes (WLEDs)

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  • Extension of the molten salt strategy to all alkali chlorides to confirm its universality.

    • Main Results:

    • A series of rare earth oxides with significantly enhanced luminescence were successfully prepared.
    • Up to a six-fold enhancement in luminescence intensity was achieved for Yb3+/Er3+ co-doped Y2O3.
    • The molten salt method proved effective across various alkali chlorides, indicating broad applicability.

    Conclusions:

    • Molten salt-assisted synthesis is a novel, simple, and universal strategy for enhancing lanthanide upconversion luminescence.
    • This method effectively addresses the bottleneck of weak luminescence intensity in LUCMs.
    • The enhanced upconversion luminescent materials show potential for applications in white light-emitting diodes (WLEDs) and other LED devices.