摘要
采用水热法合成了不同Tb^(3+)浓度掺杂的单分散球形PaWO_4绿色荧光粉。通过粉末X射线衍射(XRD)和扫描电子显微镜(SEM),能量色散光谱仪(EDS)来表征荧光粉的晶体结构、颗粒大小、形貌及成分;激发光谱和发射光谱以及荧光衰减曲线来表征荧光粉的荧光性能。XRD分析确认不同Tb^(3+)浓度掺杂的BaWO_4具有白钨矿结构;SEM图像显示不同Tb^(3+)浓度掺杂BaWO_4为单分散的球形荧光粉以及颗粒大小为2～4μm。研究Tb^(3+)离子掺杂浓度对发光强度的影响,结果表明,荧光粉中Tb^(3+)离子的最佳掺杂原子数分数为12%。发射光谱表明在254 nm的UV光激发下12%BaWO_4:Tb荧光粉样品与商用绿色荧光粉LaPO_4:Ce,Tb发光强度相当。由于Tb掺杂的BaWO_4绿色荧光粉具有优良的发光性能和容易制备的特点,有望成为新一代的绿色荧光粉。
Monodispersed spheres for Tb3＋-doped BaWO4 phosphors are synthesized by a hydrothermal method.Xray diffraction（XRD）,and field-emission scanning electron microscopy（SEM）,energy dispersive spectrometer （EDS） are used to characterize the resulting samples of crystal phase structure,particle size and morphology and composition.Photoluminescence excitation and emission spectra and decay curve are used to characterize the fluorescence properties of phosphors.XRD analysis confirms the formation of BaWO_4 with scheelite structure.SEM study shows that the obtained BaWO_4：Tb phosphors of different Tb^（3＋） concentrations appear to be dispersed spheres and their particle sizes range from 2 to 4μm.Analysis of the photoluminescence spectra with different Tb^（3＋） concentration reveals that the optimum dopant concentration is about 12%of Tb^（3＋） ions in BaWO_4：Tb phosphors. Photoluminescence spectra indicate the phosphors emit strong green light centered at 545 nm under 254 nm UV light excitation in comparison with the commercial green fluorescent lamp phosphor（LaPO_4：Ce,Tb）.The results shows that the intensity of BaWO_4：Tb phosphors is comparable to that of LaPO_4：Ce,Tb.The excellent luminescence properties make it a new promising green phosphor for fluorescent lamps application.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第3期839-843,共5页
Acta Optica Sinica
基金
江西省教育厅2010年度科技计划项目(GJJ10472)
赣州市有色金属技术创新公共服务平台(PT08006)
博士启动基金资助课题
关键词
光谱学
发光材料
发光
水热合成
绿色荧光粉
spectroscopy
luminescent materials
luminescence
hydrothermal synthesis
green phosphor
