基于低维链状结构的长波发射长余辉材料的发光性能及缺陷态研究

项目名称： 基于低维链状结构的长波发射长余辉材料的发光性能及缺陷态研究

项目编号： No.61308091

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 徐旭辉

作者单位： 昆明理工大学

项目金额： 26万元

中文摘要： 长波发射（600nm-1000nm）长余辉发光材料在生命医学领域应用潜力巨大，然而相比短波发射长余辉发光材料的发展较为缓慢。这主要归因于对其余辉机理过程的不明确，即对缺陷态本征属性及对载流子俘获过程认识不够透彻。本项目拟选择具有低维链状结构的基质材料，通过引入具有合适能级结构的稀土离子作为有效发光中心和陷阱中心，构建长波发射长余辉发光材料。低维链状结构为陷阱能级和激发态能级的形成提供条件，并在发光中心和陷阱中心之间构建单一方向有效传输通道。项目以调控阳离子基团连接方式为切入点，对低维结构进行设计，实现微观结构变化对缺陷结构环境以及激发态辐射跃迁过程的调制。通过微观缺陷结构的研究，探究缺陷态的本征属性及其俘获载流子的能力，进一步了解载流子俘获、释放及运输的物理机理。项目的研究成果将为长波发射长余辉发光材料的设计和研发提供新的思路和理论依据。

中文关键词： 长余辉发光；低维结构；缺陷态；陷阱；热释光

英文摘要： The development and research of persistent phosphors in the 600-1000nm are far behind their visible counterparts, even though there are increasing demands in recent years for applications as indentification markers in defense and security and as optical probes in bio-imaging. The main reason is that the persistent luminescence mechanism is usually complicated and has not been well studied, especially the research on the intrinsic properties of defect state and the trapping process of carriers is lacked. In this work, we aim at to realize the persistent luminescence with long wavelength emission in unique host with a low-dimensional chain crystal structure, for which doped with rare earth ions with suitable level structure as the effective luminescent centers and trap centers, respectively. The low-dimensional chain crystal structure is beneficial to the formation of the trap level and excited state level, and especially could provide a effective transmission path in one direction between luminescent centers and trap centers. In this research, it is facile to realize the investigation of the effect of microstructure changes on the defect structure environment and excited state transition process by designing the low-dimensional crystal structure with adjusting the chaining way of cations' groups. Furthermore, a c

英文关键词： long persistent luminescence；Low dimensional structure；defect state；traps；thermluminescence