基于Ga族多元合金量子点及量子点基水凝胶膜的白光LED构筑、发光机理及其光度优化

随着量子点技术的发展与应用，量子点白光LED将成为下一代照明光源，具有节能、环保、高光效等优势。目前，二/三元合金量子点的能带宽可调范围受到组分的限制，而四元或四元以上合金量子点，其组分控制和能带调节具有更大的灵活性和发展空间；但是，基于Ga族的四元或四元以上合金量子点的研究工作几乎未见系统报道。本项目重点研究基于Ga族高效多元合金量子点的设计与合成，开发新型高效多元合金量子点合成技术，希望首次获得一系列光谱可调谐的Ga族新型多元合金量子点，拓宽量子点体系，以期为量子点的能带调控提供新思路；并基于上述固态/液态合金量子点及量子点基荧光水凝胶膜进行不同类型的新型白光LED器件构筑，研究其发光物理过程及其光、电、热等特性，并对其进行光谱模拟及光度优化；同时，重点对量子点激子模型的构建、禁带宽度和电子结构的确定、载流子能量转移机理及多发射竞争机制展开研究；有望为新一代全光谱白光照明提供技术支撑。

With the development of quantum dot-based technology, quantum dot white LED will become the next generation of lighting source, because of their advantages such as energy saving, green production, high luminescence efficiency, and high lighting stability, etc. At present, the tunable range of energy bandgap of binary and ternary alloyed quantum dots is limited by the composition, while the composition control and energy bandgap adjustment of quaternary or above alloyed quantum dots have greater flexibility and development space; however, the research work of quaternary or above alloyed quantum dots based on Ga elemnet has hardly been reported systematically. This project focuses on the design and synthesis of Ga-based high-efficiency multicomponent alloyed quantum dots and the development of new synthesis technology. It is hoped that a series of spectral tunable Ga-based multi-element alloyed quantum dots will be obtained for the first time, and the quantum dot system will be widened in order to provide new ideas for the band regulation of quantum dots. The luminescence mechanism is mainly studied, including the construction of exciton model of alloyed quantum dots, the determination of bandgap width and electronic structure, carrier energy transfer mechanism and the multi-emission competition mechanism. In this study, three kinds of QD-WLEDs based on Ga group multicomponent alloyed QDs and QD/PAAm hydrogel film are fabricated and their spectral optimization are simulated, which can provide technology support for novel full-spectrum WLED.