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+-O2-和W6+-O2-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(Rc)为1.263 4 nm。在314 nm或394 nm激发光下, 样品发出红光(λmax=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。

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+-O2- and W6+-O2- 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(Rc) is 1.263 4 nm. Under 314 or 394 nm excitation, the samples can emit red light(λmax=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.