零热猝灭无机发光材料的开发与机理研究

热猝灭效应是稀土掺杂发光材料中普遍存在的问题，是限制无机发光材料在诸多领域应用的重要因素之一。本项目从多角度出发，提出借助优化工艺、表面处理、阳离子取代、高温相变、能量传递等多种方法，制备具有零热猝灭特性的荧光材料。通过实验分析与理论计算相结合的方式，研究基质材料的价带、导带以及陷阱能级的位置关系，建立陷阱能级深度与热猝灭强度之间的联系，建立能量补偿理论模型，揭示普遍规律，为改善稀土掺杂发光材料的热猝灭特性并开发具有零热猝灭效应的荧光材料开辟新的思路，提供理论依据和切实可行的方法。本项目有望从根本上解决稀土掺杂发光材料普遍存在的热猝灭问题，从而进一步促进其发展及应用。

Thermal quenching is a common problem in rare-earth-doped luminescent materials, which is an important factor that restricts the application of the inorganic luminescent materials in many fields. In this project, many approaches such as process optimization, surface treatment, cation substitution, high-temperature phase transition and energy transfer will be proposed to prepare zero-thermal-quenching luminescent materials. By the means of combining experimental analysis and theoretical calculation, the positions of the valence band, conduction band and trap energy level of the materials will be determined, and the relationship between trap depth and thermal quenching will be established. The theoretical model of energy compensation will be set up, by which the universal law of zero thermal quenching can be revealed. Theories and principles will be explored, and practical ways will be provided for improving the thermal quenching property of rare-earth-doped luminescent materials and developing luminescent materials with zero-thermal-quenching characteristic. This project is expected to fundamentally solve the thermal quenching problem of rare-earth-doped luminescent materials, so as to further promote the development and application of such materials.