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Abstract <p>Y<sub>2</sub>GaTaO<sub>7</sub> complex oxide and a series of (Y<sub>1–<i>x</i></sub>Sm<sub><i>x</i></sub>)<sub>2</sub>GaTaO<sub>7</sub> solid solutions were synthesized by the citrate method for the first time. The samples were studied by X-ray diffraction of synchrotron radiation, scanning electron microscopy, diffuse reflection, and photoluminescence. All synthesized compounds have a layered pyrochlore-like structure (space group <i>R</i><InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\bar {3}\)</EquationSource> <!--InrgChem2660152Egorysheva-m1--> </InlineEquation>). Y<sub>2</sub>GaTaO<sub>7</sub> is a self-activated phosphor that exhibits a wide emission band with a maximum at 455 nm. The origin of the self-luminescence in Y<sub>2</sub>GaTaO<sub>7</sub> is attributed to electron transitions in TaO<sub>6</sub> and GaO<sub>6</sub> groups. (Y<sub>1–<i>x</i></sub>Sm<sub><i>x</i></sub>)<sub>2</sub>GaTaO<sub>7</sub> phosphors exhibit bright orange-red radiation under excitation at near-UV light. Their emission spectrum contains bands associated with both the host-luminescence and the <i>f</i>–<i>f</i>-transitions of Sm<sup>3+</sup> ions. Concentration quenching of Sm<sup>3+</sup> luminescence in (Y<sub>1–<i>x</i></sub>Sm<sub><i>x</i></sub>)<sub>2</sub>GaTaO<sub>7</sub> is observed at an activator content &gt;7 mol %. Due to the energy transfer from TaO<sub>6</sub> and GaO<sub>6</sub> to Sm<sup>3+</sup> ions, it is possible to change the luminescence spectrum of the phosphor by varying the Sm<sup>3+</sup>concentration.</p>

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Synthesis, Structure, and Luminescent Properties of a New Phosphor Y2GaTaO7: Sm3+

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • A. V. Egorysheva,
  • E. F. Popova,
  • D. V. Kombanaki,
  • A. G. Son,
  • E. S. Kulikova

摘要

Abstract

Y2GaTaO7 complex oxide and a series of (Y1–xSmx)2GaTaO7 solid solutions were synthesized by the citrate method for the first time. The samples were studied by X-ray diffraction of synchrotron radiation, scanning electron microscopy, diffuse reflection, and photoluminescence. All synthesized compounds have a layered pyrochlore-like structure (space group R \(\bar {3}\) ). Y2GaTaO7 is a self-activated phosphor that exhibits a wide emission band with a maximum at 455 nm. The origin of the self-luminescence in Y2GaTaO7 is attributed to electron transitions in TaO6 and GaO6 groups. (Y1–xSmx)2GaTaO7 phosphors exhibit bright orange-red radiation under excitation at near-UV light. Their emission spectrum contains bands associated with both the host-luminescence and the f–f-transitions of Sm3+ ions. Concentration quenching of Sm3+ luminescence in (Y1–xSmx)2GaTaO7 is observed at an activator content >7 mol %. Due to the energy transfer from TaO6 and GaO6 to Sm3+ ions, it is possible to change the luminescence spectrum of the phosphor by varying the Sm3+concentration.