中文摘要：

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。

英文摘要：

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.