摘要
本文研究了基质发光材料Na_5Eu(MoO_4)_4制备过程中加入H_2WO_4或SiO_2后发光增强的现象.对Na_5Eu(Mo(1-x)W_xO_4)_4体系,当0<x<0.21时,Eu^(3+)发光增强,当x=0.033时,增强达约30％.对Na_5Eu(MoO_4)4-SiO_2体系,当Si与(Si+Mo)的摩尔数比y在0<y<0.08范围时,Eu^(3+)发光增强,当y=0.028时,增强达约50％.
Na5Eu(MoO4)4 is a stoichiometric host luminescent material. If H2WC4 and Na2WO4 are added as reactants in synthetic process of Na5Eu(MoO4)4, the Na5Eu(Mo1-xWxO4)4 system will be synthesised. When 0<x<0.21, the fluorescence spectrum of the system, is almost the same as Na5Eu(MoO4)4 and the intensity of main emission peak is higher than that of latter. The maximal increase is about 30% when x is 0.033. The X-ray powder diffraction analysis shows that when the value of x increases, the ratio of crystal cell parameter c/a decrease. It means that W ions enter into the lattice of Na5Eu(MoO4)4. The reason of enhancement by W might be related to the change of crystal field environment of Eu3 + . If SiO2 is added as a reactant in synthesis process of Na5Eu(MoO4)4, when the molar ratio of Si to(Si + Mo), y, in 0<y<0.08, the intensity of main peak will increase and the maximal increase is about 50% when ;y = 0.028. According to X-ray diffraction analysis, the reason of enhancement might be related to alpha cristobe-lite which is formed by added SiO2 and forms the encapsulation of Na5Eu(MoO4)4.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1991年第3期267-271,共5页
Chinese Journal of Luminescence
