GdAlO3：Er^3＋／Yb^3＋／Tm^3＋上转换荧光粉的制备与发光性能表征  

Preparation and Up-Conversion Photoluminescence Properties of GdAlO_3:Er^(3+)/Yb^(3+)/Tm^(3+)

作　　者：邓陶丽 闫世润[2] 

机构地区：[1]安顺学院化学化工学院,贵州安顺561000 [2]复旦大学化学系,复旦-科恒发光材料研究中心,上海200433

出　　处：《中国稀土学报》2018年第1期27-33,共7页Journal of the Chinese Society of Rare Earths

基　　金：贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]273);贵州省科技计划项目(黔科合LH字[2016]7271号)资助

摘　　要：采用NH4HCO3共沉淀法合成了单相的钙钛矿(Gd AlO 3:Er^(3+)/Yb^(3+)/Tm^(3+))纳米荧光粉体,并用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱仪(FR-IR)、荧光发射光谱对荧光粉体(Gd AlO 3:Er^(3+)/Yb^(3+)/Tm^(3+))进行表征。结果表明:使用NH4HCO3共沉淀法比传统的固相法制备发光体系所需的煅烧温度更低,而且能够得到分散均匀的、颗粒大小一致的纳米荧光粉。在980 nm波长激发下,掺杂Er^(3+)/Yb^(3+)的Gd AlO 3荧光粉体系得到524,546(绿光)与659 nm(红光)的上转换发射光谱,且红光比例随着Er^(3+)和Yb^(3+)的掺杂浓度增加而不断增加,并对其能量传递机制进行了分析;最后,通过添加Tm^(3+)离子,在荧光粉(Gd AlO ^(3+)3:Er^(3+)/Yb^(3+)/Tm)体系中调节三种稀土离子的掺杂浓度,得到了较理想的复合白光。The single phase nano-phosphor GdAlO3： Er^3＋/Yb^3＋/Tm^3＋ was prepared by coprecipitation methods with NH4HCO3 as the precipitator, and up-conversion photoluminescence （UCPL） of the phosphors was investiga- ted using powder X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Fourier-transform infrared （FTIR） spectroscopy, and UCPL spectroscopy. The results showed that the preparation using coprecipitation method gave a uniform distribution and same size nano-phosphor GdAlO3 ：Er^3＋/Yb^3＋/Tm^3＋ under lower calcinations tem- perature than those needed for solid-state reactions. Under excitation with 980 nm IR radiation, bright green UCPL at wavelengths of 524 and 546 nm, and red UCPL at 659 nm were observed. The ratio of the red UCPL was im- proved with the increase of the concentrations of Er^3＋ and Yb^3＋, and the energy transfer mechanism of the UCPL was explained successfully. Finally, the doping concentration of the three rare earth ions in the phosphor （ GdAlO3 ： Er^3＋/Yb^3＋/Tm^3＋ ） system was adjusted to obtain the ideal composite white light by adding Tm^3＋ ions.

关 键 词：GdAlO3荧光粉 复合白光 上转换发光材料 稀土离子 

分 类 号：O646[理学—物理化学]