CaMoO_4:Eu^(3+)红色荧光粉化学共沉淀合成与表征  

Synthesis and Characteristic of CaMoO_4:Eu^(3+) Red Phosphor for W-LED by Co-precipitation

作　　者：杨玉玲[1] 黎学明[1] 冯文林[1] 李武林[1] 陶传义[1] 

机构地区：[1]重庆大学化学化工学院,重庆400044

出　　处：《无机材料学报》2010年第10期1015-1019,共5页Journal of Inorganic Materials

基　　金：重庆市自然科学基金重点项目(2005BA4016);重庆大学211工程创新人才培养计划建设项目(S-091013);中国博士后基金(20100470810)~~

摘　　要：以NH4HCO3-NH3·H2O为混合沉淀剂,采用化学共沉淀法制备CaMoO4:Eu3+红色荧光粉.通过TG-DTA和XRD研究CaMoO4:Eu3+前驱体的热分解和晶相形成过程;采用SEM和PL表征了该荧光粉的表面形貌和发光性能,并与NH4HCO3沉淀剂、NH3·H2O沉淀剂合成的CaMoO4:Eu3+荧光粉以及高温固相法制备的荧光粉进行对比.结果表明,煅烧温度700℃时,前驱体能够完全转换成单一CaMoO4:Eu3+白钨矿结构;煅烧温度900℃制备的荧光粉发光强度达到最大值;采用混合沉淀剂制备的荧光粉大小均匀、无团聚、呈类球型,平均粒径0.9μm.与高温固相法比较,其激发光谱中的Eu-O电荷迁移带向长波方向微小移动,而7F0→5L6(394nm)和7F0→5D2(465nm)的强电子吸收能有效改善红色荧光粉使用性能;与单独的NH4HCO3或NH3·H2O沉淀剂或高温固相法相比,该荧光粉发光性能显著改善,发光强度为传统固相法的2倍.Using NH4HCO3-NH3·H2O as a mixed precipitator,CaMoO4：Eu3＋ red phosphor was successfully synthesized by chemical co-precipitation method.The processes of thermal decomposition and phase formation for CaMoO4：Eu3＋ precursor were analyzed by TG-DTA and XRD.Compared with solid-state method,both surface morphology and luminescence properties of CaMoO4：Eu3＋ red phosphor using precipitators NH4HCO3,NH3·H2O and NH4HCO3-NH3·H2O are evaluated by means of SEM and PL respectively.After calcination at 700℃,the precursor is completely converted to a single scheelite structure of CaMoO4：Eu3＋.Photoluminescence intensity of the phosphor reaches the maximum value at 900 ℃.The phosphor prepared by using mixed precipitator is uniform spherical particle,and has no aggregation with average size of 0.9μm.Compared with solid-state method,the Eu-O CTS of the red phosphor slightly shifts toward long wavelength.The strong electron absorbability of 7F0→5L6（394nm） and 7F0→5D2（465nm） effectively improves the performance of red phosphor.In addition,the photoluminescent intensity from the mixed precipitation is increased to 2 times of that of the red phosphors prepared by solid-state method.

关 键 词：共沉淀 CaMoO4:Eu3+ 红色荧光粉 

分 类 号：TQ174[化学工程—陶瓷工业]