纳米胶囊包覆的三重态湮灭光子上转换材料的研究及其应用

项目名称： 纳米胶囊包覆的三重态湮灭光子上转换材料的研究及其应用

项目编号： No.51202207

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 籍少敏

作者单位： 湘潭大学

项目金额： 25万元

中文摘要： 上转换发光材料是一种能够实现低能量光波向高能量光波转换的发光材料。目前基于三重态-三重态湮灭（TTA）机制上转换，由于其上转换效率高、所需的激发光能量低，在太阳光辐射下即可发生上转换，在染料敏化太阳能电池和生物标记等领域具有广泛的应用前景。基于TTA的上转换体系主要由三重态敏化剂和能量受体两部分组成，该领域面临的难题是，此类机制的上转换主要在溶液中发生，很难作为一个分子整体使用，这将大大限制其应用领域，因此如何将该上转换体系中的敏化剂和受体固载化是应用的关键。本项目拟通过选用二氧化钛等无机非金属纳米胶囊包覆敏化剂和能量受体，并对纳米胶囊微环境下的上转换规律进行探索，即与普通溶液环境相比，处于纳米胶囊微环境下的上转换体系中敏化剂与受体之间的能量传递效率以及上转换发光效率的改变。在应用方面主要研究固载后的上转换材料在染料敏化太阳能电池中的应用，旨在提高染料敏化太阳能电池对长波段太阳光的利用。

中文关键词： 上转换；三重态湮灭；三重态能量传递；纳米胶囊；胶束软模板

英文摘要： Upconversion (UC), which is the observation of emission (or population of excited states) at higher energy after excitation at lower energy. The triplet-triplet-annihilation (TTA)-based upconversion has a broad application prospect, such as dye-sensitized solar cells (DSSC) and biological fileds etc., because of its high upconversion efficiency and occurring under sunlight-like condition, namely low-intensity excitation light. The system of TTA-based upconversion consists of triplet sensitizer and acceptor. At present, the TTA-based upconversion mainly occurred in solution not as a single unit, which will significantly limit its applications. It is one of the key problems for the application of TTA based upconversion that how to encapsulate the triplet sensitizer and acceptor and obtain the solid upconversion materials. This project intends to encapsulate the triplet sensitizer and acceptor with inorganic nanocapsules, as well as to explore the variation law of TTA based upconversion in nanocapsules microenvironment. For example, the energy transfer efficiency between sensitizer and acceptors as well as the upconversion quantum yields will be affected in nanocapsules microenvironment. We will investigate these encapsulated TTA upconversion materials in the application of dye-sensitized solar cells to increase th

英文关键词： upconversion；triplets annihilation；triplet energy transition；nanocapsules；micelles soft-template