其他名称：
24-73-00034
项目负责人：
Bogachev Nikita
发表日期：
2024
主持机构：
Federal State Budgetary Educational Institution of Higher Education "Saint-Petersburg State University",
国家：
俄罗斯
开始日期：
2024
结束日期：
2026
简介：
This project is aimed at studying nanosized phosphors based on solid solutions of fluorides of rare earth elements and s-elements. These multifunctional inorganic materials can exhibit both luminescent and magnetic properties, allowing them to be used for non-invasive diagnostics of tissues of living organisms, and in preparations for radio-, photothermal and photodynamic therapy.$To date, the targeted creation of such materials remains a difficult task, which is caused by the complex nature of the influence of synthesis conditions and the composition of such compounds on their functions. The luminescent and magnetic properties of such materials are determined by the type of crystal lattice (matrix-host for luminescent ions), morphology, particle size, and the ability of the matrix to form substitutional solid solutions with compounds of other lanthanides, including those that do not exhibit luminescent properties. Among the above, the type of crystal structure of the host matrix seems be the most important factor influencing the optical properties of phosphors, since it determines the symmetry of the environment of such ions, the density of their arrangement in the structure, which affects the relative spatial arrangement of luminescence centers in the matrix structure. In this project, nanocrystalline solid solutions of fluorides of rare earth and various alkali metals, MeGdF4 (Me = K, Rb, Cs), doped with rare earth ions (Eu, Tb) will be synthesized and studied. On the one hand, the choice of research objects is due to the presence of a large number of results of research in recent years on the functional properties of particles based on NaReeF4 (Ree = Y, Gd, Lu) doped with rare earth ions, and, on the other hand, to rare and unsystematic information about the properties of similar compounds on based on MeReeF4 matrices (Me = K, Rb, Cs), which can exhibit better functional characteristics. Varying the type of alkali metal ion will make it possible to trace the influence of the lattice type of the host matrix on the above-mentioned functional properties of the particles without seriously changing their physicochemical properties. The usage of this approach to studying the relationship between the structure and properties of particles constitutes the scientific novelty of this project.
专业领域：
材料科学
语种：
英语
