过渡金属双掺杂白光量子点的可控制备及LED应用

Development of novel luminescent materials and preparation of efficient white LED has important implications for the energy conservation of our country. The project intends to focus on controlled synthesis and luminescent properties of transition metals (Mn/Cu) dual doped quantum dots (QDs) with white light emitting, and achieve white QD-LED with practical value. We try to fabricate Mn/Cu-doped ZnSe and ZnInS QDs, understand the relationship between the doping position, doping concentration and migration rate of the dopants and the luminous efficiency and emission spectrum, and develop synthetic methods of highly emissive white light doped QDs. We also try to understand the elementary chemical and physical processes of doping occurring from the micro scale, and from the bandgap engineering perspective understand how to change the distance between the two kinds of dopant ions and regulate their interaction, and achieve the independent emitting of two kinds of dopant ions. Highly luminous efficiency white QD-LED can be achieved by controlling the luminescent properties of QDs. Researches on these key issues will provide materials basis and experimental guidance for practical applications of white QD-LED.

开发新型发光材料、制备高效白光LED对我国节能减排具有重要意义。本项目拟围绕过渡金属（Mn/Cu）双掺杂白光量子点的可控制备及发光性能研究开展工作，获得有实用价值的量子点白光LED。合成Mn/Cu双掺杂ZnSe和ZnInS等量子点，理解掺杂离子的位置、浓度和迁移速率与量子点的发光效率和发光光谱之间的关系，发展高效发光的白光双掺杂量子点制备技术；力图从微观尺度上理解掺杂发生的基本化学与物理过程，并从能带工程角度理解如何改变两种杂质离子之间的距离和调节它们之间的相互作用，实现两种掺杂离子分立发光；通过调控量子点的发光性质，获得高光效的白光量子点LED。上述关键问题的研究，可为量子点白光LED的实际应用提供材料基础和实验指导。

本项目利用能带工程理论，系统研究了双波长发光量子点的制备条件，并研究了掺杂浓度、掺杂时间、掺杂离子的种类等对量子点光学性质的影响。通过调控势垒层的厚度，改变晶核与表面层之间的电子耦合程度，实现Mn/Cu/Ag/Ni等双波长发光掺杂量子点的可控制备和CdSe/ZnS/CdSe、CdSe/CdS/CdSe双波长荧光发射，并通过变温光谱和变温寿命研究其光学性质，应用于LED研究。另外，我们将II-VI族量子点拓展到钙钛矿量子点的研究，研究了杂质离子的种类、前驱体的活性、掺杂温度和浓度等实验条件的影响，并通过变温光谱研究其光学性质，侧重解决其稳定性不足的问题，下一步应用于LED的研究。综上，我们较好地完成了申请书预期研究计划，并开拓了一些新型材料，为量子点的基础研究和广泛应用做出了贡献。