高压下金属量子点结构调控与荧光发射增强研究

Fluorescence quantum dots (QDs) are an important subject in the field of material research, and have attracted wide attention. In this project, we have chosen new fluorescent metal QDs as the research object. Diamond anvil cells combined with in situ high pressure measurement technologies, the large volume high pressure apparatus and theoretical calculation will be used. This project aims to explore the evolution of their structures under different pressure, realize the structural assembly to enhance the fluorescence emission performance by the cooperative effect of high pressure and surface ligands, reveal the internal relationship among the structure, ligand, and optical properties, clarify the regulation mechanism of high pressure on its structure, electronic structure, electron transfer between QDs and surface ligand and low dimensional quantum effect, search the possibility of obtaining high luminescence metal QDs by high pressure process. Through the implementation of the project, it can not only improve our understanding of the metal QDs but also get some innovative research results with independent intellectual property rights. This project will provide scientific support for the broad application of this kind of materials in light-emitting diodes and optoelectronic devices.

荧光量子点是当前材料研究领域的重要课题，已经引起科学家们的广泛关注。本项目拟选择新型的荧光金属量子点为研究对象，采用金刚石对顶砧压机及大腔体压机和多种原位高压测量技术，结合理论模拟计算，探索高压下金属量子点的结构稳定性与变化规律；发挥高压与表面配体的协同作用，实现其结构组装，增强荧光发射性能；揭示金属量子点结构、配体、与光学性质的内在联系；阐明高压对其结构、电子结构、量子点与表面配体电子转移及低维量子效应的调控机理；探索利用高压方法获得高亮荧光金属量子点的可能性。通过该项目的实施不仅可以加深对金属量子点物理本质的理解，而且有望获得一些具有自主知识产权的创新性研究成果，为此类材料在发光二极管、光电器件等的广泛应用提供科学依据。

随着高压下原位结构和性质测量技术的快速发展，高压在科学研究中起着越来越重要的作用，为构筑新型功能材料提供一种有效的新途径。在本项目的资助下，我们利用金刚石对顶砧压机及大腔体压机和多种原位高压测量技术，实现了压力诱导金属基量子点的晶体结构演变、结构组装、压致变色和压致荧光增强等新奇特性，“截获”了具有优异性能的新结构材料。此外，我们还探索了高压下碳量子点和金属卤化物等其它荧光功能材料体系的新结构和新性质，发现这些荧光功能材料高压下荧光增强，卸压后增强的荧光能够保留至常压。结合理论模拟计算，深入研究了高压作用下量子点结构和光学特性的构效关系，为设计和制备新型荧光功能量子点材料拓展了新途径。在本项目的支持下，发表标注项目资助的高水平SCI 检索文章12篇，其中包括Adv. Funct. Mater. 1篇，Chem. Sci. 1篇，Nanoscale Horiz. 3篇，J. Phys. Chem. Lett. 1篇，Nanoscale 1篇，ACS Appl. Nano Mater. 1篇，ACS Appl. Energy Mater. 1篇，获得授权发明专利2项，顺利完成任务书中规定的考核指标。