金属纳米点的二维可控自组装及光电功能增强

High performance luminescent materials are the key in recent illumination and display field. As novel phosphors, metal nanodots (M-dots) are potentially useful in light-emitting diode (LED) devices, but meet the challenges of weak luminescence, poor stability, low color purity, and so forth. In this project, self-assembly technique will be employed to fabricate M-dots two-dimensional (2D) structures for enhancing luminescent performance, and followed by incorporating with polymers for further acting as the color conversion layer on LED. The researches mainly include the following four parts. First, the self-assembly process of M-dots will be studied to reveal the driving force and mechanism, so as to control the thickness, shape, and lateral size. Second, the relation between 2D assembly and luminescent performance will be revealed, which will facilitate the design and fabrication of specific 2D structures for optimizing and tuning luminescent intensity and color. Thirdly, the 2D assembly structures will be incorporated with polymers and other nano-building blocks for further performance enhancement. Finally, new methods for device construction will be investigated, which will promote the design of LED prototype and fabrication of high performance LED devices.

探索新型发光材料始终是照明显示领域的重要课题。金属纳米点作为一种新兴的发光材料，潜在应用于LED领域，但需要解决发光弱、稳定性差和色纯度低等问题。本项目拟利用自组装技术，通过形成金属纳米点的二维组装结构实现光电性能增强，与高分子材料等复合后作为光转换层用于LED器件制备。主要包括以下几个方面内容：(1)研究金属纳米点的二维自组装过程，揭示组装驱动力及组装机理，实现对组装结构厚度、形状、层数、侧向维度等的调控；(2)探究二维组装结构与发光性能的关系，通过设计制备特定结构的二维组装体实现对发光强度、发光颜色等的优化与调控；(3)将金属纳米点二维组装结构与高分子材料等杂化复合，获得进一步的功能增强；(4)研究针对二维组装材料的器件构筑新方法，构建LED器件原型，制备彩色及白光LED器件。

本项目利用自组装技术，通过调控金属纳米点的二维组装结构实现光电性能增强，解决金属纳米点发光弱、稳定性差和发光颜色单一等问题，与高分子材料等复合后用于LED器件制备。主要完成了4个方面的研究：(1)研究了金属纳米点的合成与表面修饰方法，合成了表面功能可调的Au、Ag、Cu纳米点；(2)以纳米点为结构基元，构筑了二维组装结构，实现了对组装结构及其光电性能的调控；(3)将上述金属纳米点及其二维组装结构与高分子材料复合杂化，获得进一步的功能增强；(4)研究了基于金属纳米点的LED器件构筑方法，构建了结构新颖的LED器件。本项目资助下，共发表SCI论文5篇，项目负责人2018年入选万人计划科技创新领军人才，培养博士研究生5名。