Bi^3+浓度对Y2O3基荧光粉发光性能的影响  

Effect of Bi Concentration on Photoluminescence Properties of YO:Bi^3+ Phosphors

作　　者：李倩[1] 张彪 史忠旗[1] 康永锋[2] LI Qian;ZHANG Biao;SHI Zhongqi;KANG Yongfeng(State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Key Laboratory for Physical Electronics and Devices of the Ministry of Education,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学材料科学与工程学院,金属材料强度国家重点实验室,西安710049 [2]西安交通大学电子与信息工程学院,电子物理与器件教育部重点实验室,西安710049

出　　处：《硅酸盐学报》2020年第9期1462-1467,共6页Journal of The Chinese Ceramic Society

基　　金：陕西省创新能力支撑计划项目(2018TD-031)。

摘　　要：采用高温固相法合成了Y2O3:x Bi^3+[x=0.05-1.00%(摩尔分数)]荧光粉,研究了Bi^3+掺杂浓度对荧光粉相组成、微观形貌及发光性能的影响。结果表明:Bi^3+掺杂量增加会引起Y2O3基质晶格膨胀和晶胞体积增大;荧光粉呈等轴状颗粒形貌,且随着Bi^3+掺杂量的增加,粒径逐渐从250 nm增加到600 nm。Y2O3:x Bi^3+荧光粉在波长为335 nm的紫外光激发下,其发射光谱由370、410和483 nm 3个宽带发射组成。370 nm紫外光发射和410 nm蓝光发射分别是由Bi^3+的S6位点的3Au→1Ag和3Eu→1Ag电子跃迁产生,483 nm蓝绿光发射是由C2位点的3B→1A电子跃迁产生。当Bi^3+掺杂浓度为0.25%时,荧光粉发光性能最优;掺杂量大于0.25%时,由于Bi^3+间的偶极-偶极相互作用,产生浓度猝灭现象。所制备的Y2O3:0.25%Bi^3+荧光粉的色坐标为(0.159 2、0.218 1),显色指数Ra为69.27,表明这种蓝绿色荧光粉在白光LED领域具有良好应用前景。Y2O3:xBi^3+(x=0.05-1.0%(mole fraction)) phosphors were synthesized by a solid-phase reaction route.Effect of Bi^3+concentration on the phase composition,microstructure and photoluminescence (PL) performance was investigated.The results show that the lattice parameter and cell volume of Y2O3 host increase with the increase of Bi^3+concentration.In addition,the phosphors are equiaxed grains,and the grain size increases gradually from 250 to 600 nm with the Bi^3+concentration increasing.The emission spectra of Y2O3:Bi^3+phosphors excited by ultraviolet light (λEX=335 nm) are composed of three broadband emission spectra centered at 370 nm,410 nm and 483 nm.The ultraviolet-emission at 370 nm and blue-light emission at 410 nm appear due to 3Au→1Ag and3Eu→1Ag electron transitions of S6 sites of Bi^3+,respectively.The blue-green emission at 483 nm occurs due to 3B→1A electron transition of C2 sites of Bi^3+.The Y2O3:0.25%Bi^3+phosphor shows the optimal PL performance.The concentration quenching occurs when Bi^3+concentration is higher than 0.25%due to the dipole-dipole interaction between Bi^3+ions.The color coordinate of Y2O3:0.25%Bi^3+is (0.159 2,0.218 1),and the color rendering index Ra is 69.27,indicating that the as-synthesized blue-green phosphors have a broad application prospect in the field of white light-emitting diode.

关 键 词：氧化钇 蓝绿色 浓度猝灭 荧光粉 

分 类 号：TB32[一般工业技术—材料科学与工程]