应用于白光照明的高荧光量子效率碳纳米点复合荧光粉的研制

Carbon nanodots (CDs) have become the hot topic in nanomaterial science and technology, and it is one of the break-through point to promot the development of lighting illumination. Especially, It is of great scientific significance and application value to realize the achievement of CDs with photoluminescent (PL) emissions from yellow to red and CDs-based solid-state phosphors with high PL quantum yields (PLQYs). This project is carried out on investigating the following several aspects. Developing the new methodology of synthesizing CDs, which is simple, high-efficient and low-cost. By varing the kinds and contents of doped elements in carbogenic nucleus, the inner structure and surface ligand groups could be adjusted, and therewith realizing the PL emissions from yellow to red. Setting up a new concept for preparing composite materials based on electrostatic interactions. Sequentially electrostatic aborbing ions onto the surfaces of CDs is adopted to construct CDs-based phosphors with high PLQYs. By virtue of the CDs-based phosphors, white lighting illumination with high color rendering index, high luminous efficacy, and controllable color temperature is expect to be achieved.

发光碳纳米点已经成为纳米发光材料的研究热点。目前碳纳米点研究遇到的主要问题是缺少黄光到红光波段高荧光量子效率的碳纳米点，以及碳纳米点在固态时存在聚集引起的荧光淬灭。本项目将通过调控碳纳米点中掺杂元素含量和其共轭尺寸，控制碳基内核的共轭程度及表面的化学结构，实现碳纳米点在黄光到红光波段的高效发光；通过对碳纳米点表面逐步静电吸附离子并原位形成无机包覆层，抑制碳纳米点聚集引起的荧光淬灭，研制高荧光量子效率、高稳定性的固相碳纳米点复合荧光粉，并以其研制高性能固态白光照明器件。

发光碳纳米点已经成为纳米发光材料的研究热点。目前碳纳米点研究遇到的主要问题是缺少黄光到红光波段高荧光量子效率的碳纳米点，以及碳纳米点在固态时存在聚集引起的荧光淬灭。本项目将通过调控碳纳米点中掺杂元素含量和其共轭尺寸，控制碳基内核的共轭程度及表面的化学结构，实现碳纳米点的高效发光；通过对碳纳米点表面逐步静电吸附离子并原位形成无机包覆层，抑制碳纳米点聚集引起的荧光淬灭，研制高荧光量子效率、高稳定性的固相碳纳米点复合荧光粉，并以其研制高性能固态白光照明器件。在项目资助下，项目负责人提出以含氮组装体制备发光带隙可调控的碳纳米点的思路，即通过尿素和柠檬酸组装体的可控缩聚实现具有富氮石墨烯结构的碳纳米点的可控生长，研制出一系列高效发光的碳纳米点；针对碳纳米点固态下的荧光淬灭的问题，以分散吸附、静电诱导无机粒子包覆、原位膨化烧结的方法，克服了碳纳米点固态体系下的荧光淬灭，为碳纳米点在白光照明中的应用打下基础。此外，在白光照明的基础上，项目负责人开发出基于碳纳米点的可见光光通讯技术（通信带宽>285 MHz），拓展了碳纳米点功能体系的设计思路和应用领域。