纳米Y_2O_3:Eu^(3+)荧光强度降低的J-O理论分析  

Analysis of the Fluorescence Intensity Decrease of Nanocrysalline Y_2O_3:Eu^(3+) Based on the J-O Theory

作　　者：张伦[1] 罗宏雷[1] 俞先妙[1] 郭庆文[1] 

机构地区：[1]中国矿业大学南湖校区理学院物理系,江苏省徐州市三环南路221116

出　　处：《光谱实验室》2011年第2期631-635,共5页Chinese Journal of Spectroscopy Laboratory

基　　金：浙江省自然科学基金资助(101020)

摘　　要：用均相沉淀法制备了纳米Y2O3:Eu3+样品。归纳了纳米Y2O3:Eu3+荧光强度降低的原因及提高途径。应用Judd-Ofelt理论从Y2O3:Eu3+的发射光谱编程计算了纳米与微米Y2O3:Eu3+的跃迁强度参数之比Ω′2/Ω2,比值均小于1,这表明纳米Y2O3:Eu3+颗粒的5D0→7F2电偶跃迁几率比微米材料小,5D0→7F2跃迁几率小则612nm的荧光强度低。因此纳米YO:Eu3+颗粒的荧光强度较微米材料低。Different sizes of nanocrysalline Y2O3：Eu3＋ were prepared by the homogeneous precipitation method.The influence of the nano particle size on the its fluorescence intensity were studied.According to Judd-Ofelt（J-O） therory,the ratio of the transition intensity parameters Ω′ 2Ω 2 between the nanocrystalline Y2O3：Eu3＋ and the bulk material were calculated from the emitting spectra of Eu3＋ ions by computer programs.All the ratio less than one indicates that the 5D0→7F2 transition probability of the nanocrystalline Y2O3：Eu3＋is smaller than that of the bulk material.Low 5D0→7F2 transition probability causes light fluorescence intensity of 612nm.Thus the fluorescence intensity of nanocrysalline Y2O3：Eu3＋ is lower than that of bulk material.

关 键 词：纳米Y2O3:Eu3+ 发射光谱 Judd-Ofelt参数 荧光强度 

分 类 号：O482.31[理学—固体物理] O657.61[理学—物理]