Ba3WO6:Eu3+红色荧光粉的结构及其发光特性

以高温固相法成功合成了一系列Eu³⁺离子激活Ba₃WO₆红色荧光粉。分别采用X射线衍射（XRD）和荧光光谱（FL）对样品的晶体结构和发光性能进行了表征。结果表明，样品均具有立方晶系的双钙钛矿结构；Eu³⁺离子的激发谱由一个宽带（包括Eu³⁺-O^2-和W⁶⁺-O^2-电荷转移带）和若干个窄峰（4f-4f电子跃迁）组成，而跃迁⁵D₀→⁷F₁和⁵D₀→⁷F₂则构成了发射谱的主要部分。调整原材料中BaCO₃和WO₃的量的比，XRD的主衍射峰位发生红移至与标准谱完全吻合，发光强度有所提升并分析了原因。Eu³⁺离子的临界摩尔分数为0.05，临界距离（R_c）为1.263 4 nm。在314 nm或394 nm激发光下，样品发出红光（λ_max=596 nm），色坐标为（0.618，0.342），在LED照明、显示等领域具备一定潜力。

Structure and Luminescence of Red Phosphor Ba3WO6: Eu3+

A series of Eu³⁺ activated Ba₃WO₆ red phosphors were synthesized by high temperature solid state method. The structure and luminescence properties were characterized by XRD and FL, respectively. The results show that all samples have the cubic double-perovskite structure. The excitation spectrum of Eu³⁺ is consisted of a broad band including the Eu³⁺-O^2- and W⁶⁺-O^2- charge transfer bands and several peaks due to 4f-4f transitions of Eu³⁺. The emission spectrum is majorly consisted of transitions ⁵D₀→⁷F₁ and ⁵D₀→⁷F₂. By adjusting the mole ratio of BaCO₃ and WO₃, the peaks of XRD are red shifted and accorded with the standard, the luminescence intensity is promoted. The critical mole fraction of Eu³⁺ is 0.05 and the critical distance(R_c) is 1.263 4 nm. Under 314 or 394 nm excitation, the samples can emit red light(λ_max=596 nm) with CIE color coordinates around (0.618, 0.342), suggesting the synthesized phosphors as promising candidate in the LED lighting and display fields.