多模协同增强NaREF4(RE=Y,Gd)上转换发光纳米材料的发光效率

项目名称： 多模协同增强NaREF4(RE=Y,Gd)上转换发光纳米材料的发光效率

项目编号： No.11504317

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 翟雪松

作者单位： 盐城工学院

项目金额： 24万元

中文摘要： 上转换发光纳米晶在生物医学领域的应用是近年来研究热点，但是其高激发光功率和低转换效率阻碍了该领域的进一步发展。虽然采用单一模式，如晶体场修饰（Li+离子等掺杂）、表面钝化（核壳包覆）、局域等离子辅助能量传递（贵金属修饰）等手段增强其发光效率为消除这些障碍提供了可能，但是各单一模式对上转换发光效率的提高具有各自的局限性。本项目拟以六角相NaREF4纳米晶为基质材料，利用多模（晶体场修饰、表面钝化、局域等离子辅助能量传递等）协同增强上转换发光纳米晶的发光效率。本项目将系统探讨离子(Li+等)掺杂浓度、核壳结构的壳层厚度、上转换发光纳米粒子和金纳米粒子两者的比例等参数对发光效率的影响，深入揭示各模式之间的相互联系和协同作用，最终获得高转换效率和低激发阈值的上转换发光纳米晶。相关工作是在项目组前期研究积累基础上的延伸和重要拓展，项目的实施有利于上转换发光纳米晶在生物医学相关领域的进一步应用与发展。

中文关键词： 上转换发光纳米晶；单一模式；多模式；协同效应；发光效率

英文摘要： Recently, the application of upconversion nano-materials on the field of bio-information is becoming hot topic. However, the high excitation power density and low conversion efficiency of upconversion nanomaterials have been the key limitations in the practical application. The upconversion luminescence efficiency can be enhanced via tailoring the local crystal field (such as Li+ ion doping), surface passivation (core-shell structure), localized surface plasmon resonance (LSPR) assisted energy transfer (nobel metal modification) (signal mode) and so on, but any signal mode has its limitations. On the basis of previous researches, this proposed project is to choose hexagonal NaREF4 nanocrystals as host materials and enhance upconversion efficiency via multimode synergistic effect. To obtain the upconversion nanocrystals with high luminescence efficiency and low excitation power density, we will optimize the Li+ ion doping concentrations, the shell thickness of the core-shell nanoparticles, and the ratio of the Au nanocrystals and upconversion nanocrystals, and find the internal connections and synergistic effect among every signal mode. Current work is an important extension of our previous research, will be benefit for the application and development of the upconversion nanocrystals in the field of biological information.

英文关键词： Upconversion nanocrystals;Signal mode;Multi-mode;Synergistic effect;Luminescence efficiency