In this study, a series of spindle-like Na₃Y_1−x(PO₄)₂: xTb³⁺ phosphors have been controllably synthesized by an ionic liquid-assisted hydrothermal route. The structures and morphologies of the as-synthesized products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Photoluminescence spectroscopy (PL), fluorescence decay, and temperature-dependent emission spectroscopy were adopted to characterized the luminescence properties of the samples. The excitation spectra of Na₃Y_1−x(PO₄)₂: xTb³⁺ comprised several well-resolved absorption bands at 273, 285, 304, 318, 340, 352, 368, and 378 nm. When excited at 368 nm, Na₃Y_1−x(PO₄)₂: xTb³⁺ phosphors could exhibit emission bands at 490 nm (⁵D₄ → ⁷F₆), 545 nm (⁵D₄ → ⁷F₅), 586 nm (⁵D₄ → ⁷F₄), and 624 nm (⁵D₄ → ⁷F₃), respectively. The concentration quenching occurred when x is beyond 0.22. The decay time of the photoluminescence of Na₃Y_1−x(PO₄)₂: xTb³⁺ decreased with the increase of Tb³⁺ doping, which demonstrated the existence of energy transfer among Tb³⁺ ions. The Commission Internationale de L’Eclairage (CIE) chromaticity coordinates of Na₃Y_0.78(PO₄)₂: 0.22Tb³⁺ were (0.3273, 0.5199) at 273 K, which located in the green region. The temperature dependence experiments revealed that the title material had excellent luminescence thermal stability. The luminescence intensity of Na₃Y_0.78(PO₄)₂: 0.22Tb³⁺ phosphor at 473 K declined 22.1% to its initial intensity. The title material could be used as green light-emitting phosphor for cold white LED applications.

在这项研究中，通过离子液体辅助水热途径可控制地合成了一系列纺锤状的Na ₃ Y _{1- x}（PO ₄）₂：x Tb ³⁺荧光粉。通过X射线衍射（XRD）和扫描电子显微镜（SEM）表征所合成产物的结构和形态。采用光致发光光谱（PL），荧光衰减和依赖温度的发射光谱来表征样品的发光特性。Na ₃ Y _{1− x}（PO ₄）₂：x Tb的激发光谱³⁺包含几个在273、285、304、318、340、352、368和378 nm处良好分辨的吸收带。当在368 nm处激发时，Na ₃ Y _{1- x}（PO ₄）₂：x Tb ³⁺磷光体可以在490 nm（⁵ D ₄  →  ⁷ F ₆），545 nm（⁵ D ₄  →  ⁷ F ₅）处显示发射带。），586 nm（⁵ D ₄  →  ⁷ F ₄）和624 nm（⁵ D ₄  →  ⁷ F ₄）₃）。当x超过0.22时，发生浓度猝灭。Na ₃ Y _{1- x}（PO ₄）₂：x Tb ³⁺的光致发光衰减时间随Tb ³⁺掺杂的增加而减少，这表明在Tb ³⁺离子之间存在能量转移。Na ₃ Y _0.78（PO ₄）_2的国际照明委员会（CIE）色度坐标：0.22Tb ³⁺分别为（0.3273，0.5199）和273 K，位于绿色区域。温度依赖性实验表明标题材料具有优异的发光热稳定性。Na ₃ Y _0.78（PO ₄）₂：0.22Tb ³⁺荧光粉在473 K处的发光强度下降至其初始强度的22.1％。标题材料可用作冷白色LED应用的绿色发光磷光体。