摘要
稀土Tb^(3+)掺杂磷酸钆(GdPO_(4))绿色荧光粉是实现白光LED的潜在荧光粉,其常规水热法的制备存在反应时间较长、Tb^(3+)的掺杂量偏低等问题。本文采用水热法结合高温烧结制备了一系列Gd_(1-x)PO_(4)∶xTb^(3+)(x=0、1%、5%、11%、13%、15%、17%、19%)样品,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)-能谱仪(EDS)、红外光谱仪(FT-IR)和荧光分光光度计对所得样品的相结构、形貌、元素组成、光学吸收和发光性能进行了表征。研究结果表明,所合成样品均为GdPO_(4)的纯相,属于单斜晶系独居石结构,且Tb^(3+)均匀分布在GdPO_(4)基质中引起晶格收缩。在274 nm的光激发下,GdPO_(4)∶Tb^(3+)荧光粉的最强发射峰位于545 nm处,属于Tb^(3+)的^(5)D_(4)→^(7)F_(5)跃迁,且其荧光猝灭摩尔分数高达15%,此样品(GdPO_(4)∶15%Tb^(3+))表现出优异的绿光发射和良好的热稳定性。
Rare earth Tb^(3+)doped gadolinium phosphate(GdPO_(4))green phosphor is a potential phosphor for white LED,while the preparation by conventional hydrothermal method has some problems,such as long reaction time and low doping amount of Tb^(3+).A series of Gd_(1-x)PO_(4)∶xTb^(3+)(x=0,1%,5%,11%,13%,15%,17%,19%)samples were prepared by hydrothermal method combined with high temperature sintering.The phase structure,morphology,elemental composition,optical absorption and luminescence properties of samples were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM)-energy spectrometer(EDS),infrared spectrometer(FT-IR)and fluorescence spectrophotometer.The results show that,all the synthesized samples are pure phase of GdPO_(4)belonging to monoclinic monazite structure,and the Tb^(3+)are uniformly distributed in GdPO_(4)matrix and cause lattice shrinkage.Under 274 nm photoexcitation,GdPO_(4)∶Tb^(3+)phosphors have the strongest emission peak at 545 nm,which belongs to^(5)D_(4)→^(7)F_(5)transition of Tb^(3+).The fluorescence quenching concentration of Tb^(3+)was determined to be 15%(molar ratio),and this sample(GdPO_(4)∶15%Tb^(3+))exhibits excellent green light emission and good thermal stability.
作者
孟晓燕
廖云
张丽蓉
张雨蒙
吴丽丹
杨流赛
MENG Xiaoyan;LIAO Yun;ZHANG Lirong;ZHANG Yumeng;WU Lidan;YANG Liusai(School of Chemistry and Environmental Science,Shangrao Normal University,Shangrao 334001,China)
出处
《人工晶体学报》
北大核心
2024年第1期107-114,共8页
Journal of Synthetic Crystals
基金
江西省教育厅科技项目(GJJ211714)
江西省自然科学基金(20212BAB213029)
上饶市科技厅项目(2022YF022)。
关键词
磷酸钆
Tb
3+掺杂
水热法
高温烧结
发光性能
绿色荧光粉
gadolinium phosphate
Tb^(3+) doping
hydrothermal method
high temperature sintering
luminescent property
green phosphor
