A series of LuNbO₄:xDy³⁺ (x = 0–0.20) phosphors was prepared using a high-temperature solid-state reaction technique. X-ray diffraction (XRD) along with Rietveld refinement, field emission scanning electron microscopy (FE-SEM) observations, diffuse reflectance spectra (DRS), UV-vis photoluminescence (PL), fluorescence decays, PL quantum yields (QYs), and low-voltage cathodoluminescence (CL) were employed to characterize the phosphors. Nonradiative relaxation and host sensitization dramatically influence the LuNbO₄:Dy³⁺ luminescence spectra and decay dynamics. It is shown that cross-relaxation arising from electric dipole–dipole interactions between adjacent Dy³⁺ ions is the leading mechanism of quenching the Dy³⁺ emission. The host sensitization for Dy³⁺ emission in LuNbO₄ was confirmed and the energy transfer efficiency from the host to Dy³⁺ increased with increasing Dy³⁺ doping concentration/temperature. Upon excitation with ultraviolet light (261 nm) and a low-voltage electron beam (2 kV, 127 μA cm⁻²), the synthesized LuNbO₄:Dy³⁺ phosphors show both the blue broadband emission of the LuNbO₄ host and the characteristic emission of Dy³⁺ (the dominant one is the ⁴F_9/2 → ⁶H_13/2 transition, yellow), and the luminescence colour of the LuNbO₄:Dy³⁺ phosphors can be tuned over a large gamut of colours by varying the Dy³⁺ doping concentration, and a single-phase intense white-light-emission has been achieved in the LuNbO₄:0.015Dy³⁺ phosphor. On the basis of the good UV-vis PL and CL properties, LuNbO₄:Dy³⁺ phosphors might be promising for applications in UV light-emitting diodes (UV-LEDs) and field emission displays (FEDs).

中文翻译：

---

紫外线和低压电子束激发下LuNbO ₄中Dy ³⁺的主体致敏发光：能量转移和白光发射

使用高温固态反应技术制备了一系列LuNbO ₄：x Dy ³⁺（x = 0-0.20）荧光粉。X射线衍射（XRD）以及Rietveld精修技术，场发射扫描电子显微镜（FE-SEM）观测，漫反射光谱（DRS），紫外可见光致发光（PL），荧光衰减，PL量子产率（QYs）和低压阴极发光（CL）用于表征磷光体。非辐射弛豫和主体敏化显着影响LuNbO ₄：Dy ³⁺发光光谱和衰减动力学。结果表明，相邻Dy ³⁺之间的电偶极-偶极相互作用引起的交叉弛豫离子是猝灭Dy ³⁺发射的主要机制。证实了主体对LuNbO _4中的Dy ³⁺发射的敏化，并且随着Dy ³⁺掺杂浓度/温度的增加，从主体到Dy ³⁺的能量转移效率增加。在用紫外线（261 nm）和低压电子束（2 kV，127μAcm ^-2）激发时，合成的LuNbO ₄：Dy ³⁺荧光粉既显示LuNbO ₄主体的蓝色宽带发射光，又显示出其特性的Dy发射³⁺（占主导地位的是⁴ ˚F _9/2 → ⁶可以通过改变Dy ^3+的掺杂浓度和单相强白光来调节H _13/2过渡（黄色）和LuNbO ₄：Dy ³⁺荧光粉的发光颜色。在LuNbO ₄：0.015Dy ³⁺荧光粉中实现了发射。基于良好的紫外可见光PL和CL特性，LuNbO ₄：Dy ³⁺磷光体可能有望在紫外发光二极管（UV-LED）和场发射显示器（FED）中应用。