多铝酸盐晶体结构调制的3d3电子态Mn4+/Cr3+荧光增强机制研究

项目名称： 多铝酸盐晶体结构调制的3d3电子态Mn4+/Cr3+荧光增强机制研究

项目编号： No.51302059

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 王雷

作者单位： 合肥工业大学

项目金额： 25万元

中文摘要： 在照明和显示领域，高效、廉价的红色荧光材料研究备受关注。为了获得高效3d3电子态Mn4+/Cr3+激活红色荧光材料，本项目拟在晶体结构类型丰富的多铝酸盐中开展Mn4+/Cr3+发光效率与Al-O多面体对称性的关联性研究。本项目通过在低温态对基质电子结构和激活剂离子中间能级的研究，获得抑制声子参与发光行为的有效手段；通过同步辐射X-射线磁性圆二色（XMCD）探测Mn4+/Cr3+在晶格中的占位及其价态变化情况；通过X-射线吸收近边结构(XANES)谱获取Mn4+/Cr3+在晶格环境的变化情况，揭示晶体结构构型以及缺陷态对激活离子周围局域环境及其电子结构的影响规律以及电荷转移规律性。研究结果对Mn4+/Cr3+发光效率的改善和新型发光材料的筛选及制备具有重要指导意义和理论价值。

中文关键词： 杂质能级；过渡金属离子；发光；；

英文摘要： Red-emission phosphors excited by blue or near-ultraviolet LED chips (n-UV LEDs) (380-420 nm) have been intensively investegated in recent years.Usually, the most frequently used red phosphors for LEDs are rare earth (RE) ions doped nitride/oxynitrides, such as CaAlSiN3:Eu2+, BaY2Si2Al2O2N5 : Eu2+, most of starting materials of those phosphors are either nitrides of the alkaline-earth elements or rare earth elements, which are expensive or difficult to synthesis and handle, because high nitrogen pressures are required for their synthesis. Consequently, the search for less expensive, facile for synthesis, has been a long-standing and important issue in new phosphors development. Mn4+/Cr3+ doped red emission phosphors attracted special interest because of their ability to function at unusually high temperatures under ultraviolet excitation. In fact, transition metal ion with electron configuration dn (0< n< 10) is of a broad and strong absorption band in UV region due to ligand to metal charge-transfer. Therefore, the transition metal ions have potential applications in developing high efficient UV-chip LED devices. In this project, our proposes are based on our previous research results. Special attention is paid to the crystal field analysis of the experimental features in relation to the structural data, and f

英文关键词： impurity levels；transitional metal ions；luminescence；；