【作者】 潘文； 宁桂玲； 林源； 杨雪峰；

【Author】 PAN Wen NING Gui-ling LIN Yuan YANG Xue-feng (State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116012,China)

【机构】 大连理工大学精细化工国家重点实验室；

【摘要】 研究溶胶-凝胶法合成 Sr₂Al₂SiO₇：Ce³⁺,Tb³⁺ 白色长余辉发光材料。用 X 射线粉末衍射鉴定 Sr₂Al₂SiO₇晶型结构的形成。通过扫描电镜照片可以观察到合成粉体的微观结构,是由0．5～1μm 烧结良好的规则颗粒组成．荧光分光光度测定了光谱特性。Ce³⁺, Tb³⁺共激活的 Sr₂Al₂SiO₇白色长余辉材料有4个发射光谱,其中包括：在414nm Ce³⁺的特征光谱和在482,543 和588nm Tb³⁺的特征光谱。通过改变激活离子的组成可以观察到 Tb³⁺和 Ce³⁺之间的能量转移。溶胶-凝胶法合成的磷光体形成晶相更加完全,颗粒直径小、粉体松散, 具有更强的发光起始强度和更优异的余辉性能。更多还原

【Abstract】 Sr₂Al₂SiO₇:Ce³⁺,Tb³⁺white emitting phosphors were fabricated by the sol-gel method.X-ray powder diffraction（XRD）analysis confirmed the formation of Sr₂Al₂SiO₇:Ce³⁺,Tb³⁺.Scanning electron microscopy（SEM） observation indicated that the microstructure of the phosphor consisted of regular fine grains with an average size of about 0.5-1μm.Luminescence properties were analyzed by measuring the photoluminescence spectra.The resultant(Ce³⁺, Tb³⁺)-codoped Sr₂Al₂SiO₇ phosphors show four main emission peaks:one at 414 nm for Ce³⁺and three at 482,543 and 588 nm for Tb³⁺.The emission spectra of the samples with different doping concentrations show that the Tb³⁺emission is dominantly due to the persistent energy transfer from Ce³⁺.The decay characteristic is better than that prepared by solid-state process in the comparable condition.The codoped phosphor showed long persistence white phosphorescence.更多还原