微波辅助均相沉淀法制备（Y1-x-y, Lay）2O3:xEu3+红色荧光粉

用微波辅助均相沉淀法制备了一系列（Y_1-x-y, La_y）₂O₃:xEu3+(x=0.01~0.05, y=0.05~0.25) 红色荧光粉.研究Eu3+、La3+的掺杂浓度和煅烧温度对荧光粉性能的影响.通过差热分析仪、红外光谱仪、XRD、SEM和荧光分光光度计，对前驱体热重曲线和FTIR曲线、样品的晶体结构、表面形貌及颗粒大小和荧光性能进行表征.结果表明:前驱体组成为 (Y, La, Eu) OHCO₃·nH₂O；所制备样品为立方晶系；SEM显示荧光粉为均匀分散的球形颗粒，粒度为200 nm左右；较为适宜的焙烧温度为900 ℃；La3+掺杂含量y=10 %, Eu3+掺杂含量x=3 %时，样品荧光粉发光性能最好，最大发射波长为614 nm，对应的是Eu3+的5D₀→7F₂跃迁；样品的色坐标为 (0.654, 0.346).所制备的（Y_1-x-y, La_y）₂O₃:xEu3+荧光粉具备较好的发光强度与色纯度. 

Preparation of (Y1-x-y, Lay)2O3:xEu3+ red phosphors by microwave-assisted homogeneous precipitation method

A series of (Y_1-x-y, La_y)₂O₃:xEu3+(x=0.01~0.05, y=0.05~0.25) red phosphors were synthesized by microwave-assisted homogeneous precipitation method. The effects of doping density of Eu3+ and La3+, the calcining temperature on the characteristics of lumen-escence were investigated. The TG and FTIR curves of precursor, crystal structure, surfacemorphology, particle size and spectral characteristics of the samples were also investigated by differential thermal analysis, infrared spectroscopy, X-ray diffraction, SEM and fluoresc-ence spectrophotometer. The results indicate that the composition of precursor is (Y, La, Eu) OHCO₃·nH₂O and the as-prepared samples are cubic system. The SEM show that the samples are uniformly dispersed spherical phosphors particles with particle size of being about 200 nm. The optimum calcining temperature is 900 ℃. The optimum emission intensity of 614 nm is obtained when the x=0.03, y=0.1, 614 nm is corresponding to 5D₀→7F₂ transitionof Eu3+ ions in emission spectrum. The color coordinates of the sample is (0.654, 0.346).(Y_1-x-y, La_y)₂O₃:xEu3+ phosphors have good color purity and luminous intensity.