白光Mn掺杂ZnCuGaS/ZnS量子点的制备及在电致发光器件中的应用

The quantum dot light-emitting diode (LED) is distinguished solid-state white-lighting source, owing to the advantages of high efficiency, low cost, low toxicity and easy processing. Exploring innovative white-lighting quantum dot materials and building highly efficient LEDs conform to the national development strategy of energy conservation and environmental protection. In this project, based on our previous work, we intend to prepare highly efficient white-light-emissive Mn:ZnCuGaS/ZnS quantum dots by optimizing the reaction conditions; reveal the luminescence mechanism, establish the corresponding relationship between the experimental variables and luminescence spectra, and achieve precise control on the white-light emission of Mn:ZnCuGaS/ZnS quantum dots; perform ligand shortening on Mn：ZnCuGaS/ZnS quantum dot film to improve the carrier mobility; and establish a carrier transport model on Mn:ZnCuGaS/ZnS-based LEDs, design and optimize the device structure and geometric parameters, and produce highly efficient and stable white LEDs. At present, researches on Mn: ZnCuGaS/ZnS quantum dots or their electroluminescent properties have not been reported yet. The implementation of this project is expected to improve the performance of quantum dot white LEDs, which is of not only the scientific significance, but also the practical value for developing environmentally-friendly and high-performance quantum dot white LEDs.

量子点发光二极管（LED）白光光源具有效率高、成本低、无污染、易加工等特点。发展新型白光量子点材料并制备高效LED符合国家节能环保的发展战略。本项目拟在前期工作的基础上，优化反应条件，制备出高效白光Mn：ZnCuGaS/ZnS量子点；揭示Mn：ZnCuGaS/ZnS量子点的发光机制，建立实验变量与发光光谱的对应关系，实现对Mn：ZnCuGaS/ZnS量子点白光发射的精准调控；对Mn：ZnCuGaS/ZnS量子点薄膜进行配体短化处理，提升薄膜的载流子迁移率；建立Mn:ZnCuGaS/ZnS量子点LED载流子传输模型，优化器件结构和几何参数，制作高效稳定的白光LED。目前，Mn：ZnCuGaS/ZnS白光量子点及其电致发光性能的研究未见报道。本项目的实施，有望提升白光量子点LED的性能表现，对发展新型廉价环保、性能优异的白光量子点LED具有重要的科学意义和实用价值。

为了获得效率高、成本低、无污染的LED，我们开发了系列新型量子点发光材料，解决了荧光量子点材料发光效率低、发光不易调节、毒性高、稳定性差等问题，进而基于系列的量子点发光材料制作了电致及光致发光LED。主要完成了4个方面的研究：（1）研究了Mn：CuGaS/ZnS量子点的合成与荧光调节方法。（2）研究了币金属纳米点的合成、调控及光电性能应用。（3）研究了钙钛矿材料的组成、结构与宏观性质与发光性能之间的对应关系。（4）研究了提升基于不同发光材料的光致及电致发光LED性能的方法。本项目资助下，共发表SCI论文8篇，授权国家发明专利2项，培养研究生7名。