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A solid-solution modulation strategy in trivalent bismuth-doped gallate phosphors for single substrate tunable

Yao Wang1, Ning Guo1, Yanmei Xin1

  • 1Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China. guoning@usst.edu.cn.

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|September 21, 2021
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Summary

This study introduces a new strontium lanthanum gallium oxide fluoride phosphor doped with bismuth ions, enabling tunable luminescence for anti-blue lighting and white light applications. The material also shows promise for optical thermometry due to its temperature-dependent luminescence.

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Area of Science:

  • Solid-state inorganic chemistry
  • Luminescence and spectroscopy
  • Materials science for lighting and sensing

Background:

  • Lanthanide-doped phosphors typically require reducing atmospheres for synthesis, posing challenges.
  • Bismuth (Bi3+) doping offers an alternative, avoiding harsh conditions and providing environmental benefits.
  • Tuning the spectral properties of Bi3+ remains a significant challenge for its widespread application.

Purpose of the Study:

  • To develop a novel solid-solution phosphor based on Sr2+La1-xGaO5-xFx for tunable luminescence.
  • To investigate the luminescence properties of Bi3+ and its potential for anti-blue lighting.
  • To explore dual-doping strategies (Bi3+-Eu3+ and Bi3+-Er3+) for white light emission and optical thermometry.

Main Methods:

  • Synthesis of Sr2+La1-xGaO5-xFx solid solutions with varying 'x' values.
  • Photoluminescence spectroscopy to analyze excitation and emission properties.
  • Evaluation of thermal stability and temperature-dependent luminescence for optical thermometry applications.

Main Results:

  • Regulating 'x' in Sr2+La1-xGaO5-xFx effectively promotes and tunes Bi3+ luminescence, achieving redshifted emission via an excitation-driven strategy.
  • A Bi3+-Eu3+ co-doped system was realized, producing stable white light emission across varying concentrations and excitation wavelengths.
  • The phosphor exhibited excellent thermal stability with an activation energy of 0.257 eV (for 2.5% Eu3+ doping) and demonstrated high relative and absolute sensitivities for optical thermometry.

Conclusions:

  • The developed Sr2+La1-xGaO5-xFx solid solutions provide a viable platform for tunable Bi3+ luminescence, suitable for anti-blue lighting.
  • The Bi3+-Eu3+ system successfully achieves single-matrix white light phosphors.
  • The material's distinct thermal luminescence responses make it a promising candidate for advanced optical thermometry sensors.