Ba^(2+)共掺杂YPO_4∶Tb^(3+)荧光材料的水热合成与荧光性能  

Ba^(2+) Co-doped YPO_4∶Tb^(3+) Phosphors:Hydrothermal Synthesis and Photoluminescence Properties

作　　者：付兵 欧娅[1,2] 刘欢 顾曼琦 陈卓[1,2] 杨锦瑜[1,2] FU Bing OU Ya LIU Huan GU Manqi CHEN Zhuo YANG Jinyu(School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001 Key Lab for Functional Materials Chemistry of Guizhou Province, Guiyang 550001)

机构地区：[1]贵州师范大学化学与材料科学学院,贵阳550001 [2]贵州省功能材料化学重点实验室,贵阳550001

出　　处：《材料导报》2017年第18期16-20,共5页Materials Reports

基　　金：国家自然科学基金(213610007);贵州省自然科学基金(黔科合J字[2012]2269号);贵州省高层次人才科研特助经费项目(TZJY-2011-40);贵州省国际科技合作计划项目(黔科合外G字[2013]7015号)

摘　　要：采用水热法合成Ba^(2+)共掺杂YPO4∶Tb^(3+)荧光材料,并通过X射线衍射(XRD)、扫描电子显微镜(SEM)和荧光分光光度计等研究了合成样品的物相组成和荧光性能,并分析了Ba^(2+)掺杂量和反应体系pH值等对合成样品的物相结构及荧光性能的影响。结果表明,反应体系pH值和Ba^(2+)掺杂量直接影响所制备样品的结构与性能。少量Ba^(2+)(≤10%,原子分数,下同)共掺杂YPO4∶1%Tb^(3+)样品均为纯相四方晶系磷钇矿结构晶体,过量Ba^(2+)掺杂导致Ba_3(PO_4)_2杂质相的出现;pH值为6的水热环境下可获得高结晶度的单一相Ba^(2+)、Tb^(3+)共掺杂YPO4样品。激发和发射光谱测试结果表明,所制备的YPO4∶1%Tb^(3+),x%Ba^(2+)样品可被225nm的紫外光有效地激发而发射出强烈的Tb^(3+)特征的黄绿色光。一定量的Ba^(2+)共掺杂可以有效地提高YPO4∶1%Tb^(3+)样品的荧光性能,但过量(高于10%)的Ba^(2+)掺杂又会导致Tb^(3+)的荧光猝灭现象出现,最佳的Ba^(2+)共掺杂量为10%。所制备的YPO4∶1%Tb^(3+),10%Ba^(2+)样品在225nm紫外光激发下位于545nm处的发射带强度是YPO4∶1%Tb^(3+)样品的1.8倍。Ba（2＋） co-doped YPO4∶Tb（3＋） phosphors were successfully synthesized by hydrothermal method.The crystal structure and optical properties of the as-synthesized samples were investigated by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,photoluminescence（PL）.The influences of Ba（2＋） co-doping concentration and precursor solution pH on the phase structure and luminescence properties of the as-products were investigated.The results show that the pH and Ba（2＋） co-doping concentration play the key role in the structure and luminescence properties of the as-synthesized samples.A small amount of Ba（2＋）（no more than10 at%）co-doped YPO4∶1 at%Tb（3＋）samples are single-phase crystals with tetragonal xenotime structure,and Ba3（PO4）2 impurity phase can be observed in the sample co-doped with a large amount of Ba（2＋）.The pure and high crystallinity Ba（2＋）,Tb（3＋）co-doped YPO4 samples can be obtained at pH 6 condition.The results of excitation and emission spectra show that the YPO4∶1 at%Tb（3＋）,xat% Ba（2＋） samples can be excited by 225 nm UV light and emit the characteristic yellow-green light of Tb（3＋）.An appropriate amount of Ba（2＋）co-doped YPO4∶1 at% Tb（3＋）samples display enhanced luminescence,and a large amount of Ba（2＋）（more than 10 at%）co-doping in the YPO4∶1 at%Tb（3＋）samples can quench the Tb（3＋）emission.The optimized doping content of Ba（2＋）is 10 at%.The intensity of emission peak located at 545 nm of YPO4∶1 at%Tb（3＋）,10 at% Ba（2＋）sample are 1.8 times as many of the YPO4∶1 at%Tb（3＋）sample.

关 键 词：YPO4∶Tb3+/Ba2+ 共掺杂 水热法 荧光 稀土发光材料 

分 类 号：TQ171.112[化学工程—玻璃工业]