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<p>This study explores the regulatory effect of heat-treatment temperature on the phase composition and luminescent properties of Mg<sub>2</sub>SnO<sub>4</sub>:Eu<sup>3+</sup> phosphors prepared by microdroplet spray pyrolysis.&#xa0;A series of phosphors were synthesized, and their phase composition, morphology, and luminescent properties were systematically investigated via X-ray diffraction, fluorescence spectroscopy, and thermal stability testing. Results show that heat-treatment temperature is critical for phase regulation as pure cubic inverse spinel Mg<sub>2</sub>SnO<sub>4</sub> is obtained at 1100&#xa0;°C, while Mg<sub>2</sub>SnO<sub>4</sub>/SnO<sub>2</sub> biphasic composite structure forms at 900–1000&#xa0;°C. All samples exhibit well-defined, monodisperse spherical particles with morphology unaffected by phase evolution. Under 254&#xa0;nm excitation, biphasic composite phosphors show dominant Eu<sup>3+ 5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>1</sub> orange emission with strong afterglow, while pure-phase samples exhibit weak Eu<sup>3+</sup> red emission and green afterglow, confirming SnO<sub>2</sub> enhances Eu<sup>3+</sup> orange emission. The optimal Eu<sup>3+</sup> doping concentration is 0.02&#xa0;mol; excessive doping induces concentration quenching. Afterglow decay follows a multi-exponential model attributed to multiple trap levels, and samples with different phases show distinct thermal quenching behaviors and stability.</p>

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Heat-treatment temperature tuning the phase composition and luminescence of Mg2SnO4:Eu3+ phosphors

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Ting Yao,
  • Keke Wang,
  • Xiang Zhang,
  • Lei Cao,
  • Shixian Xiong

摘要

This study explores the regulatory effect of heat-treatment temperature on the phase composition and luminescent properties of Mg2SnO4:Eu3+ phosphors prepared by microdroplet spray pyrolysis. A series of phosphors were synthesized, and their phase composition, morphology, and luminescent properties were systematically investigated via X-ray diffraction, fluorescence spectroscopy, and thermal stability testing. Results show that heat-treatment temperature is critical for phase regulation as pure cubic inverse spinel Mg2SnO4 is obtained at 1100 °C, while Mg2SnO4/SnO2 biphasic composite structure forms at 900–1000 °C. All samples exhibit well-defined, monodisperse spherical particles with morphology unaffected by phase evolution. Under 254 nm excitation, biphasic composite phosphors show dominant Eu3+ 5D0 → 7F1 orange emission with strong afterglow, while pure-phase samples exhibit weak Eu3+ red emission and green afterglow, confirming SnO2 enhances Eu3+ orange emission. The optimal Eu3+ doping concentration is 0.02 mol; excessive doping induces concentration quenching. Afterglow decay follows a multi-exponential model attributed to multiple trap levels, and samples with different phases show distinct thermal quenching behaviors and stability.