A2B2O7型异质同构体中Er离子上转换发光的调控机理及其数学表征

项目名称： A2B2O7型异质同构体中Er离子上转换发光的调控机理及其数学表征

项目编号： No.11464017

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 游维雄

作者单位： 江西理工大学

项目金额： 54万元

中文摘要： A2B2O7（A=Y，Gd，La；B=Ce，Zr，Ti）型异质同构体是一种良好的发光基质材料.然而前期研究发现，相比于其他基质,在该体系中低声子能量的Ln2Zr2O7中却观察不到上转换发光现象，同时,申请者认为Er3+离子的上转换绿光发射应该存在新的上转换发光过程和机理.本项目拟通过设计实验方案和测试手段,对Er离子在该体系中的发光过程和机理进行明确的阐述和深入研究,在此基础上考虑基质材料组成离子种类、声子能量和稀土离子浓度等对Er3+离子上转换发光的调控机理并建立速率方程模型,并通过数学表达式把这种调控作用联系起来从而实现对Er3+离子的上转换发光强度与材料结构和稀土离子浓度之间关系进行定量或半定量表征.本项目研究有助于对Er3+离子的上转换发光机制进行深入研究和扩展,深入探索上转换发光强度与其影响因素的变化规律,为更多高效上转换发光材料的选择和制备提供一定的理论依据.

中文关键词： 异质同构体；上转换发光材料；Er离子；调控机理；数学表征

英文摘要： A2B2O7 (A=Y, Gd, La; B=Ce, Zr, Ti) isomorphisms are good candidates for luminescence materials. Our previous work shows that the upconversion emissions can not be observed in the low phonon energy Ln2Zr2O7 materials comparing with other hosts in A2B2O7 series. On the other hand, we think a new process and mechnism for green upconversion emission of Er3+ ion should be recognized. So in this program these assumptions will be confirmed and investigated deeply by means of experimental design and instrumental detection, and then rate equation model will be created by considering the role of rare earth concentrations,phonon energy and structure of material on the tunability of green and red upconversion emissions. Therefore, the tunability can be depicted with the mathematical expression in theory and the relationship between the upconversion emissions intensities of Er3+ ion and rare earth concentrations, as well as structure of material, can be characterized quantitatively or semiquantitatively. The research on this program makes the benefit to the deep investigation and expansion of the mechanism of upconversioin of Er3+ ion. Furthermore, the upconversion emission intensities and its affect factor will be explored deeply, which make the selection and preparation of other high efficient upconversion materials easier in theory.

英文关键词： Isomorphism;Upconversion emission materials;Er ion;Mechanism of tunability;Mathematical expression