高质量量子点的可控合成及其在LED照明中的应用研究

Controllable Synthesis of High Quality Quantum Dots and Application in LED Illumination

量子点是一种空间三维尺寸都在1～100 nm以内的半导体纳米晶体,由于尺寸太小,受到量子限域效应等因素影响,具有一些独特优异的光学性质,如吸收光谱宽、发射光谱窄、发光效率高等,其中最突出的特点是光谱调谐方便,只需要改变材料的尺寸,就可实现发光光谱的调谐。但是,目前稳定高效的量子点大多含Cd元素等有毒物质,限制了其在照明领域内的使用。结合照明的需求,选取钙钛矿材料以及InP材料为主要研究对象,通过改进工艺,获得了高效稳定的量子点;对含Cd量子点的无毒化处理也进行了研究,通过合金掺杂及表面包覆等方式,成功制备低毒高效的量子点;对量子点在LED照明中的应用进行了研究,获得了高显指数高光效的白光光谱组装方案。

Quantum dots are semiconductor nanocrystals with three-dimensional dimensions of less than 1-100 nm. Because of their small size and quantum confinement effect, they have some unique and excellent optical properties, such as wide absorption spectrum, narrow emission spectrum and high luminescence efficiency. Among them, the most prominent feature is spectral tuning. It is convenient to adjust the luminescence spectrum only by changing the size of the material. However, most of the stable and efficient quantum dots contain toxic substances such as Cd, which limits their use in the field of lighting. We select perovskite material and InP material as the main research object according to the need of illumination. By improving the process, we obtain high efficiency and stability quantum dots. We also study the non-toxic treatment of Cd-containing quantum dots, and successfully prepare low toxicity and high efficiency quantum dots by alloy doping and surface coating.. Finally, we studied the application of quantum dots in LED lighting, and obtained a white light spectrum assembly scheme with high display finger and high light efficiency.