Ce3+和Tb3+掺杂的BaO-La2O3-B2O3-SiO2玻璃的发光性质

来源期刊:中南大学学报(自然科学版)2009年第6期

论文作者:左成钢 卢安贤 肖卓豪 李秀英 朱立刚

文章页码:1522 - 1528

关键词:Ce3+;Tb3+;BaO-La2O3-B2O3-SiO2玻璃;闪烁;发光

Key words:Ce3+; Tb3+; BaO-La2O3-B2O3-SiO2 glass; scintillation; luminescence

摘    要:采用传统熔体冷却技术制备Ce3+和Tb3+掺杂的BaO-La2O3-B2O3-SiO2玻璃,并测试样品的吸收光谱和荧光光谱。实验结果表明:由于Ce3+在5d-4f轨道之间的电子跃迁,基础玻璃掺Ce3+后吸收截止边明显红移;掺Ce3+的BaO-La2O3-B2O3-SiO2玻璃的荧光发射光谱为峰值位于410 nm附近的宽带,对应于Ce3+的5d-4f跃迁;由于SiO2比B2O3的光碱度大,玻璃的荧光发射波长,体现出随硼硅比的降低而略有红移;还原性气氛有利于提高玻璃中Ce3+的含量,从而增强发光强度;对Ce3+和Tb3+共掺玻璃,Ce3+和Tb3+在波长200~311 nm间有激发带重叠,因存在竞争吸收,导致以此区间波长激发时Tb3+的发光有所减弱;Ce3+和Tb3+在311~444 nm间也有激发带(或激发带与发射带)部分重叠,因Ce3+和Tb3+之间存在的辐射和无辐射能量传递导致Ce3+强烈敏化Tb3+的发光。

Abstract: Ce3+ and Tb3+ doped BaO-La2O3-B2O3-SiO2 glasses were prepared by conventional melt quenching technology. Absorption spectrum and fluorescence spectrum of samples were investigated. Due to 5d-4f electronic transition, absorbent border of Ce3+ doped BaO-La2O3-B2O3-SiO2 glasses shifts toward longer wavelength. Photoluminescence spectra of Ce3+ doped BaO-La2O3-B2O3-SiO2 glasses show an obvious broad band with peak value of about 410 nm, which ascribes to 5d-4f electronic transition of Ce3+ ion. Emission wavelength increases with the reduce of the ratio of boron and silicon reduced in glasses, which can be explained with optical basicity of SiO2 and B2O3. Luminescent intensity of glasses can be enhanced as Ce3+ concentration increases in deoxidization atmosphere. For Ce3+ and Tb3+ co-doped glass, luminescent intensity of Tb3+ decreases, which can be related to the competitive absorption between Ce3+ and Tb3+ when excitation wavelength locates at 200-311 nm. However, the luminescent sensitization of Tb3+ by Ce3+ was observed on the wavelength of 311-444 nm, which is explained with the radiation energy transfer and non-radiation energy transfer from Ce3+ to Tb3+.

基金信息:国家自然科学基金资助项目

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