(Y，Gd)_2O_3：Eu^(3+)纳米粒子制备及光谱特性  

PREPARATION AND SPECTRUM CHARACTERISTICS OF(Y,Gd)_2O_3:Eu^(3+)NANOPARTICLES

作　　者：郭易芬[1] 马伟民[1] 闻雷[2] 沈世妃[3] 刘晶[1] 王华栋[3] 尹凯[3] 

机构地区：[1]沈阳化工学院材料科学与工程学院,沈阳110142 [2]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016 [3]沈阳大学材料科学与工程系,沈阳110044

出　　处：《金属学报》2008年第9期1149-1152,共4页Acta Metallurgica Sinica

基　　金：辽宁省自然科学基金项目20062001;辽宁省科技攻关计划项目2005222009资助~~

摘　　要：用湿化学共沉淀法制备了(Y,Gd)_2O_3:Eu^(3+)纳米粒子.用XRD,TEM,SEM及差示/热重分析(DSC/TG)手段对粉体进行了表征.用荧光光度计分析了样品的激发光谱和发射光谱.结果表明:在煅烧温度为800℃保温2h时,合成出近似球形、粒径均匀且分散性好的(Y,Gd)_2O_3:Eu^(3+)纳米粒子,一次颗粒尺寸约为20 nm.样品在波长为612.0 nm监控光下激发,出现235和250 nm两个激发峰,分别为(Y,Gd)_2O_3基质吸收和Eu^(3+)迁移态(CTS)吸收造成的.两个波长激发下的发射光谱峰强度前者高于后者.当掺杂Eu^(3+)的摩尔浓度为3%时,发射光谱对应~5D_0→~7F_2能级跃迁的相对峰强度最大,当Eu^(3+)掺杂的摩尔浓度为7%时,相对峰强度反而降低,这是由于Eu^(3+)的浓度猝灭造成的.（Y, Gd）2O3：Eu^3＋ nanoparticles were prepared by co precipitation method, in which ammonia was employed as precipitating agent. XRD, TEM, SEM and DSC/TG were used to analyze the morphology and characteristics of the powders. The excitation spectrum and emission spectrum of the samples were analyzed by the fluorophotometer. The results show that the powders are spherical particles with uniform size distribution of 20 nm under calcining at 800 ℃ for 2 h. The sample has two excitation peaks at 235 nm and 250 nm when the monitoring wavelength is 612.0 nm, which are caused by the （Y, Gd）2O3 medium absorption and the CTS absorption of Eu^3＋, respectively. And the intensity of the former is higher than that of the latter. When the molar concentration of doping Eu^3＋ is 3%, the emission peak of ^5D0→^7F2 transition states has the strongest intensity, and when the concentration of Eu^3＋ is 7%, the intensity decreased due to the concentration quenching.

关 键 词：闪烁体 共沉淀法 (Y Gd)2O3:Eu^3+纳米粒子 光谱特性 

分 类 号：O614.33[理学—无机化学] TQ422[理学—化学]