化学共沉淀法制备的(Y_(1-x-y),Gd_y)_2O_3∶xEu^(3+)红色荧光粉及其发光性能

Co-precipitation Synthesis and Luminescence Properties of (Y_(1-x-y),Gd_y)_2O_3∶xEu^(3+) Red Phosphors

用化学共沉淀法一次煅烧工艺合成了(Y1-x-y,Gdy)2O3∶xEu3+(x=0.06～0.10,y=0,0.20～0.25)系列红色荧光粉。用XRD、SEM和荧光分光光度计,对试样的晶体结构、表面形貌及发光性能进行表征。研究了Eu3+、Gd3+的掺杂浓度、表面活性剂的加入、煅烧温度对样品性能的影响。结果表明:样品为立方晶系;Gd3+的加入会使基体晶格发生畸变,晶胞参数增加,起到改善样品色纯度和发光效率的作用;最佳煅烧温度为900℃,比传统的高温固相法低500℃左右;所合成荧光粉的粒度主要分布在300～400 nm,结构比较松散;当x=0.08,y=0.23时,最大发射峰(λem=613 nm)强度最大。所合成的Y1-x-y,Gdy)2O3∶xEu3+荧光粉是一种性能较好的PDP用红色荧光粉。

A series of（Y1-x-y,Gdy）2O3∶xEu3＋（x=0.06-0.10,y=0,0.20-0.25） red phosphors have been synthesized by co-precipitation synthesis.The crystal structure,surface morphology and spectral characteristics of the samples were investigated by X-ray diffraction（XRD）,SEM and fluorescence spectrophotometer.The effects of doping density of Eu3＋and Gd3＋,the calcining temperature and the addition of surfactant on the characteristics of luminescence have also been investigated.It is found that the synthesized crystalline powders are cubic system.The introduction of Gd3＋ would make the crystal structure distorted and aggrandize the cell parameters,which may improve samples＇ color purity and luminous efficiency.The completely crystallized phosphors were obtained at 900 ℃,which is nearly 500 ℃ lower than the temperature of solid-state method.The particle size of the samples is loose,and their sizes are ranging from 300 to 400 nm.The optimum emission intensity of 613 nm is obtained when the x=0.08,y=0.23.Therefore,it suggests that the sample phosphors have a good spectral characteristics and can be used as PDP red phosphors.