Ca_2Y_(7.9)(SiO_4)_6O_(2-0.5x)F_x:Eu_(0.1)^((3+,2+))荧光粉的合成和发光特性  

Synthesis and Spectral Properties of Phosphors Ca_2Y_(7.9)(SiO_4)_6O_(2-0.5x)F_x:Eu_(0.1)^((3+,2+))

作　　者：石维[1] 田一光[1] 张乔[1] 赵财德 宋皎皎[1] 

机构地区：[1]温州大学化学与材料工程学院,浙江温州325035

出　　处：《中国稀土学报》2013年第4期421-430,共10页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(20771086)

摘　　要：采用高温固相反应法在弱还原气氛下制备了Ca2Y7.9(SiO4)6O2-0.5xFx:Eu(2+,3+)0.1(x=0～4)系列荧光粉。晶胞参数a,c和晶胞体积V均随着F-置换量的增加呈线性减小,晶胞参数a和c的变化率相近。荧光体中Eu2+和Eu3+共存,Eu2+3d5/2与Eu3+3d5/2电子结合能分别为1128.4和1136.3 eV,Eu2+的3d5/2与3d3/2的电子结合能差为28.4 eV。Eu2+和Eu3+的3d5/2态XPS峰面积比为6.9∶1。激发光谱由Eu3+的两个电荷迁移(CTS)带和f-f跃迁激发线组成,x=0,1的试样中出现了Eu2+的f-d跃迁强激发谱带。激发到Eu3+的电荷迁移态或激发Eu2+,除了来自Eu3+的5D0能级的发射之外,还观察到了5D1能级的强发射和5D2能级的弱发射,并且激发Eu2+时5D1→7F4发射强度超过5D0→7F2,没有出现Eu2+的明显发射,Eu2+对Eu3+发光起到很好的敏化作用。5DJ(J>0)高能级发射来自4f格位的Eu3+发光中心,Eu2+的敏化起关键作用。Eu3+在4f和6h两种格位的分布比为4∶6。The phosphors Ca2Y7.9（SiO4）6O2-0.5xFx：Eu（3＋,2＋）0.1（x=0~4） were synthesized by high-temperature solid state reactions in weak reduction atmosphere.The lattice parameters a,c and unit cell volume decreased linearly as F-content increased in host,and the rates of variation of a and c are approximate close.The binding energy of Eu2＋ 3d5/2 and Eu3＋ 3d5/2 were 1128.4 and 1136.3 eV,respectively,and the area ratio of the two XPS peaks was 6.9∶ 1.ΔEb between peaks of 3d5/2 and 3d3/2 of Eu2＋ was 28.4 eV.A strong excitation band belonging to f-d transition of Eu2＋ appeared in the excitation spectra of Eu3＋ for samples of x=0,1.The intense emission lines from transitions 5D1→7FJ（J=0~4） and weaker lines from 5D2 level of Eu3＋ were observed in the emission spectra of exciting into Eu2＋ or charge transfer state（CTS） of Eu3＋,besides lines from 5D0 level.The emission intensity of 5D1→7F4 exceeded that of 5D0→7F2 while Eu2＋ was excited and emission band from Eu2＋ was not obvious.The sensitization of Eu2＋ to Eu3＋ luminescence was excellent.The emission from the levels 5DJ（J0） is generated from luminescent center Eu3＋ situated in 4f site and depended on the existence of Eu2＋.The molar ratio of Eu3＋ ion occupied in sites 4f and 6h of phosphor is 4∶ 6.

关 键 词：发光 Eu(Ⅱ Ⅲ) 高能级 氧磷灰石 氟硅酸盐 

分 类 号：O482.31[理学—固体物理]