Tb^(3+),Sm^(3+)掺杂的可变色KSrGd(WO_(4))_(3)荧光粉的制备及发光性能研究  

Synthesis and Luminescence Properties of Tb^(3+),Sm^(3+)Doped Color-Tunable KSrGd(WO_(4))_(3)Phosphors

作　　者：王元娥 王晶 葛彩霞 傅国娟 宋明君 WANG Yuan’e;WANG Jing;GE Caixia;FU Guojuan;SONG Mingjun(School of Chemical Engineering,Shandong Chemical Engineering&Vocational College,Weifang 261100,China;School of Chemistry and Chemical&Environmental Engineering,Weifang University,Weifang 261061,China)

机构地区：[1]山东化工职业学院化学与工程学院,潍坊261100 [2]潍坊学院化学化工与环境工程学院,潍坊261061

出　　处：《人工晶体学报》2025年第4期674-683,共10页Journal of Synthetic Crystals

基　　金：潍坊市科技发展计划(2023GX011)。

摘　　要：采用高温固相法合成了系列Tb^(3+)、Sm^(3+)单掺及Tb^(3+)/Sm^(3+)共掺杂的KSrGd(WO_(4))_(3)荧光粉,并通过X射线衍射(XRD)、扫描电子显微镜(SEM)、激发光谱和发射光谱对合成荧光粉的结构、发光性能及能量传递机理进行了深入研究。在260和405 nm波长激发下,Tb^(3+)和Sm^(3+)各自发出较强的绿色光和橙红色光,二者的最佳掺杂浓度分别为0.7和0.08,此后,在浓度猝灭效应的影响下,Tb^(3+)和Sm^(3+)的发光强度均呈现逐渐下降的趋势。在KSrGd(WO_(4))_(3)∶x Tb^(3+)和KSrGd(WO_(4))_(3)∶y Sm^(3+)样品中,激活剂离子间的能量传递类型分别为电偶极-电四极、电偶极-电偶极作用。在KSrGd(WO_(4))_(3)∶Tb^(3+)荧光粉中,当掺入Sm^(3+)后,在发射光谱图上,既出现了Tb^(3+)的特征发射峰,也观察到了Sm^(3+)的特征发射峰,而且随着Sm^(3+)掺杂浓度的增加,Tb^(3+)的发光强度渐渐变弱,Sm^(3+)的发光强度却逐渐增强。实验结果表明Tb^(3+)/Sm^(3+)掺杂的KSrGd(WO_(4))_(3)荧光粉中不仅存在WO_(4)^(2-)基团向Tb^(3+)、Sm^(3+)的能量传递,也存在Tb^(3+)向Sm^(3+)的能量传递,Tb^(3+)荧光寿命实验也证实了Tb^(3+)向Sm^(3+)的能量传递。通过CIE色坐标计算,随着Sm^(3+)共掺杂浓度的增加,荧光粉的发光颜色从绿色逐渐向橙红色方向移动,实现了荧光粉的发光颜色可调,因而,合成的荧光粉在近紫外激发的白光发光二极管中具有潜在的应用价值。A series of Tb^(3+)and/or Sm^(3+)doped KSrGd(WO_(4))_(3)phosphors were prepared by the high temperature solid-state reaction.The structure,morphology,luminescence properties and energy transfer mechanisms were also investigated.Under the excitation of 260 and 405 nm,KSrGd(WO_(4))_(3)∶Tb^(3+)and KSrGd(WO_(4))_(3)∶Sm^(3+)phosphors give rise to an intense green and orange red emission,respectively.And the optimal concentration of Tb^(3+)and Sm^(3+)in KSrGd(WO_(4))_(3)phosphors are 0.7 and 0.08,separately.After that,the luminescence intensity gradually decreases with increasing of doping concentration,due to the concentration quenching effect.In KSrGd(WO_(4))_(3)∶x Tb^(3+)and KSrGd(WO_(4))_(3)∶y Sm^(3+)samples,the types of energy transfer between activator ions are dipole-quadrupole and dipole-dipole interaction,respectively.When Sm^(3+)were co-doped in KSrGd(WO_(4))_(3)∶Tb^(3+)phosphors,the characteristic emissions of both Tb^(3+)and Sm^(3+)can be observed.Furthermore,as increasing concentration of Sm^(3+),the emission intensities of Tb^(3+)decreases,while those of Sm^(3+)were enhanced.The experimental results show that there are not only energy transfer from WO_(4)^(2-)to Tb^(3+)and Sm^(3+),but also energy transfer from Tb^(3+)to Sm^(3+),in Tb^(3+)and/or Sm^(3+)doped KSrGd(WO_(4))_(3)phosphors.The fluorescence lifetime analysis of Tb^(3+)further confirmed the energy transfer from Tb^(3+)to Sm^(3+).On the basis of CIE calculation,the color of phosphor can be adjusted by fixing the doping concentration of Tb^(3+)and changing the concentration of Sm^(3+)without changing the excitation wavelength.These above results confirm that the synthesized KSrGd(WO_(4))_(3)∶Tb^(3+),Sm^(3+)phosphors may have potential application prospects for white light-emitting diodeds.

关 键 词：KSrGd(WO_(4))_(3) 荧光粉 高温固相法 浓度猝灭效应 能量传递 

分 类 号：O482[理学—固体物理]