无机化学学报

(Li,Ca,A)₂SiO₄:Eu,Bi发光体的合成和发光性能的研究(A=Al,Y,La,Gd)

STUDIES ON THE SYNTHESIS AND LUMINESCENCE PROPERTIES OF(Li,Ca,A)₂SiO₄ : Eu,Bi

作者	单位
李彬	吉林大学材料科学系, 长春130023
田一光	沈阳化工学院精细化工系, 沈阳110021
孟继武	中国科学院长春物理研究所, 长春130022

摘要: 为了寻找新的发光基质材料,用高温固相反应合成了(Li,Ca,A)₂SiO₄:Eu,Bi系列发光体(A=Al,Y,La,Gd).通过激发光谱和发射光谱的测试.首次在碱土金属硅酸盐体系中研究了Al,Y,La,Gd等三价金属离子对Bi³⁺、Eu³⁺发光特性和Bi³⁺敏化Eu³⁺发光性能的影响,得到了良好的基质组成.实验结果表明.基质中适当含量的Gd³⁺可大幅度提高Eu³⁺的发光强度,使⁵D₀-⁷F₂发射强度增加6倍.Bi³⁺对Eu³⁺有很好的敏化作用,以A=Gd或Al时较好,对⁵D₀-⁷F₁辐射跃迁的敏化效果尤为突出.

关键词: 无机材料光致发光硅酸盐

基金项目:

Abstract: The luminophors of Li_xCa_2-2xAx-y-zSiO₄: EuyBiz(A=Al,Y,La,Gd)series were synthesized by solid state reactions in order to seek new host materials of photoluminophors.In the excitation spectrum for Eu³⁺ emission, there is an intensive absorption band of Bi³⁺, and its maximum depends on the radii of A(Ⅲ)ions, besides the excitation lines of Eu³⁺ ions. The emission lines of Eu³⁺ ions at about 588nm(⁵D₀-⁷F₁)and 614nm(⁵D₀-⁷F₂)can be greatly intensed by exciting into the Bi³⁺ ion absorption band. For Gd=0.5mol, the intensity of ⁵D₀-⁷F₂ emission is increased by 6 times as compared with Gd=0.4mol. The Bi³⁺ ion can transfer a part of excitation energy to Eu³⁺ ion and acts as both sensitizer and co-activater, and the Gd³⁺ ions in the host can promote the energy transfer processes.The intensity ratio ⁵D₀-⁷F₂/⁵D₀-⁷F₁ of Eu³⁺ emission can be raised as A(Ⅲ)ion radius is larger and the ⁵D₀-⁷F₂ emission is up to the most for A=La.

Keywords: inorganle material photoiuminescence silicate

投稿时间：1989-06-08

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李彬,田一光,孟继武.(Li,Ca,A)₂SiO₄:Eu,Bi发光体的合成和发光性能的研究(A=Al,Y,La,Gd)[J].无机化学学报,1991,7(4):429-433.

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