CaBi_2Ta_2O_9:Pr^(3+)黄色荧光粉的制备与性能研究  

Synthesis and photoluminescence properties of the Pr^(3+) doped CaBi_2Ta_2O_9 yellow-emitting phosphors

作　　者：崔瑞瑞[1] 龚新勇[1] 邓朝勇[1] 

机构地区：[1]贵州大学电子信息学院电子科学系,贵州省电子功能复合材料特色重点实验室,贵州贵阳550025

出　　处：《光电子．激光》2014年第6期1134-1139,共6页Journal of Optoelectronics·Laser

基　　金：贵州省科技计划支持项目(2012-3005);贵阳市科技计划(2012101-2-4)资助项目

摘　　要：采用高温固相反应法,制备了系列Pr3+掺杂的CaBi2Ta2O9(CBTO:Pr3+)Bi层状结构铁电氧化物(BLSFs)粉体。利用X射线衍射(XRD)、扫描电子显微镜(SEM)对样品的晶体结构和形貌进行了表征。利用积分球式分光光度计和荧光光谱仪对样品的光学性能进行了分析。XRD结果表明,所生成的样品均为CBTO纯相。样品的吸收和激发光谱表明,在449~500nm波长范围存在Pr3+的f-f跃迁吸收;样品的发射光谱由绿光(525~575nm)和红光(575~700nm)发射两部分组成,避免了白光LED中再吸收的问题。随着Pr3+掺杂浓度的增加,样品的发光强度先增强后减弱,当Pr3+的掺杂浓度为2mol%时发光强度最大。研究了Ca0.98Pr0.02Bi2Ta2O9的热稳定性,并通过计算得到其热猝灭激活能E=0.24eV。显色指数(CIE)色坐标图表明,所制备的样品可以被蓝光有效激发而发出黄光。研究结果表明,CBTO:Pr3+可以用于蓝光LED芯片激发用的黄色荧光粉。A series of Pr^3＋ions doped bismuth layered-structure ferroelectrics（BLSFs）oxides CaBi2Ta2O9powders were synthesized by a solid-state reaction method.Crystal structure and morphologies of the samples were characterized by X-ray diffraction（XRD）and scanning electron microscopy（SEM）.The luminescent properties of the samples were analyzed by a spectrophotometer and a fluorescence spectrometer.The XRD results indicate that all the samples are the CaBi2Ta2O9phase.The f-f transitions of Pr^3＋ions are observed at 449-500nm through the absorption and excitation spectra of the samples.The emission spectra of the samples include a green band（525-575nm）and a red band（575-700nm）,avoiding the reabsorption problem in the white LED.And as the increase of the Pr^3＋ion concentration,the emission intensity increases first,and then decreases due to the concentration quenching effect.When the Pr^3＋ion mole concentration is 2%,the emission intensity gets to the maximum.Through the investigation of the thermal stability,the thermal activation energy of Ca0.98Pr0.02Bi2Ta2O9is calculated to be 0.24eV.The CIE chromaticity coordination shows that the samples could be effectively excited by the blue light and could emit yellow light.The results suggest that the CBTO：Pr^3＋could be used as a yellow phosphor excited by the blue LED chips.

关 键 词：光致发光(PL) Bi层状结构铁氧化物(BLSFs) 荧光粉 热稳定性 

分 类 号：O443.4[理学—电磁学]