Radioluminescence and visible photoluminescence tunability features from a single Tm³⁺-doped yttrium tantalate phosphor prepared by a soft sol–gel method designed to afford cubic Y₃TaO₇ and monoclinic M′-YTaO₄ crystalline phases are reported. The annealing temperature influenced the crystallization kinetics and stabilized a preferential phase. To investigate how the crystalline phase affected the Tm³⁺ optical properties, excitation and emission spectra in the visible range were recorded for the samples annealed at 900 or 1100 °C. Inhomogeneous broadening in the emission spectra was due to the structural disorder of the Y₃TaO₇ phase. Energy transfer between the yttrium tantalate host and Tm³⁺ ions was observed upon CT band excitation. Under UV light, an intense and tunable cyan to blue emission ascribed to both the Tm³⁺ transitions ¹D₂ → ³F₄ and ¹G₄ → ³H₆ also emerged and could be observed by the naked eye. The lifetime decay curves demonstrated the occupation of distinct sites and that the symmetry sites occupied by Tm³⁺ ions in the Y₃TaO₇ host have higher lifetime values than in the M′-YTaO₄ phase. A radioluminescence study was carried out to evaluate the yttrium tantalate scintillation performance, which was considerably enhanced in the presence of the M′-YTaO₄ phase. Intense white light emission displaying a large color correlated temperature range could be obtained by controlling the delay time for the time-resolved measurements and upon an orange-emitting phosphor addition. All the above-mentioned structural and photoluminescence properties make these Tm³⁺-doped yttrium tantalates potential candidates for photonic applications, particularly integrated w-LED systems.

中文翻译：

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用于产生青色和白光的 Tm3+ 掺杂钽酸钇的相敏辐射发光和光致发光特征

报道了通过软溶胶-凝胶法制备的单一 Tm ³⁺掺杂钽酸钇荧光粉的放射发光和可见光致发光可调特性，该荧光粉旨在提供立方 Y ₃ TaO ₇和单斜晶 M'-YTaO ₄晶相。退火温度影响结晶动力学并稳定了优先相。为了研究结晶相如何影响 Tm ³⁺光学特性，记录了在 900 或 1100 °C 下退火的样品在可见光范围内的激发和发射光谱。发射光谱的不均匀展宽是由于 Y ₃ TaO _{7的结构无序造成的}阶段。在 CT 波段激发下观察到钽酸钇主体和 Tm ^{3+离子之间的能量转移。}在紫外光下，由于 Tm ³⁺跃迁¹ D ₂ → ³ F ₄和¹ G ₄ → ³ H ₆引起的强烈且可调谐的青色到蓝色发射也出现并且可以通过肉眼观察到。寿命衰减曲线证明了不同位点的占据，并且Y ₃ TaO _7主体中Tm ³⁺离子占据的对称位点具有比M'-YTaO _{4更高的寿命值}阶段。进行了放射发光研究以评估钽酸钇闪烁性能，该性能在 M'-YTaO ₄相存在下显着增强。通过控制时间分辨测量的延迟时间和添加橙色荧光粉，可以获得显示大颜色相关温度范围的强烈白光发射。所有上述结构和光致发光特性使这些 Tm ³⁺掺杂的钽酸钇成为光子应用的潜在候选者，特别是集成的 w-LED 系统。