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<p>This research successfully prepared a novel series of La<sub>3</sub>Ga<sub>5</sub>SnO<sub>14</sub>:<i>x</i>Sm<sup>3+</sup> phosphors (<i>x</i> = 1, 2, 5, 10, 15, 20, 25, and 30&#xa0;mol%) through high-temperature solid-state synthesis. This series of phosphors exhibited excellent phase purity. The excitation spectrum of La<sub>3</sub>Ga<sub>5</sub>SnO<sub>14</sub>:Sm<sup>3+</sup> showed an optimal excitation wavelength at 403&#xa0;nm. Four distinct peaks (566, 598, 644, and 708&#xa0;nm) were observed in the emission spectrum, with the most prominent peak appearing at 598&#xa0;nm, corresponding to the <sup>4</sup>G<sub>5/2</sub>-<sup>6</sup>H<sub>7/2</sub> radiative transition of Sm<sup>3+</sup> ions. The La<sub>3</sub>Ga<sub>5</sub>SnO<sub>14</sub>:2&#xa0;mol%Sm<sup>3+</sup> was the optimal sample for effective optical performance. The concentration quenching effect is caused by nearest neighbor ion interactions. Within the temperature range of 300 to 480&#xa0;K, the La<sub>3</sub>Ga<sub>5</sub>SnO<sub>14</sub>:Sm<sup>3+</sup> phosphor demonstrated very stable luminescence, with little changes in luminous intensity and Commission Internationale de l´Eclairage (CIE) chromaticity coordinates. The synthesized phosphors show remarkable thermal stability with an activation energy barrier of <i>E</i><sub>a</sub> = 0.51&#xa0;eV, displaying unusual thermal quenching characteristics. These properties make them a highly potential candidate for white light-emitting diode (WLED) applications.</p>

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Synthesis and Optical Characterization of Novel Orange-Red Emitting La3Ga5SnO14:Sm3+ Phosphors with Abnormal Thermal Quenching and Application To w-LEDs

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Linghuan Li,
  • Huapeng Sun,
  • Anlin Zhang,
  • Min Zhong,
  • Bin Deng

摘要

This research successfully prepared a novel series of La3Ga5SnO14:xSm3+ phosphors (x = 1, 2, 5, 10, 15, 20, 25, and 30 mol%) through high-temperature solid-state synthesis. This series of phosphors exhibited excellent phase purity. The excitation spectrum of La3Ga5SnO14:Sm3+ showed an optimal excitation wavelength at 403 nm. Four distinct peaks (566, 598, 644, and 708 nm) were observed in the emission spectrum, with the most prominent peak appearing at 598 nm, corresponding to the 4G5/2-6H7/2 radiative transition of Sm3+ ions. The La3Ga5SnO14:2 mol%Sm3+ was the optimal sample for effective optical performance. The concentration quenching effect is caused by nearest neighbor ion interactions. Within the temperature range of 300 to 480 K, the La3Ga5SnO14:Sm3+ phosphor demonstrated very stable luminescence, with little changes in luminous intensity and Commission Internationale de l´Eclairage (CIE) chromaticity coordinates. The synthesized phosphors show remarkable thermal stability with an activation energy barrier of Ea = 0.51 eV, displaying unusual thermal quenching characteristics. These properties make them a highly potential candidate for white light-emitting diode (WLED) applications.