通信与照明两用多基色LED频率响应特性调控研究

可见光通信技术和照明相融合，未来进入千家万户。LED作为核心器件，存在电-光调制带宽小且与光效存在矛盾等问题。多基色LED具有无荧光粉、高光效、波分多路通信的特点，不仅是智能照明的光源选择，且是高速可见光通信的发射器，面临多基色LED光效及带宽发展不平衡，本项目拟对多基色硅基LED的频率响应特性进行研究，利用硅衬底GaN基LED在长波长黄绿光外延材料及垂直结构芯片制造的优势技术基础，构建“外延技术创新-载流子输运-载流子复合几率及寿命-电光转换效率及电光响应速度”的关系链，提出利用V坑减短载流子输运路径的学术思想并研究低寄生电容的GaN基LED外延结构。研究清楚GaN基LED中载流子寿命及输运机制和寄生效应对频率响应特性的影响机制这两个科学问题。研制出高光效、高调制带宽的功率型多基色(蓝、青、绿、黄、橙、红) LED，为能够满足照明需求的高速可见光通信提供核心器件，并实现产业化应用。

The integration of visible light communication and lighting will enter millions of households in the future. As a core device, LED has problems such as a small electro-optical modulation bandwidth and contradiction with light efficiency. Color-Mixed LEDs have the characteristics of no phosphor, high light efficiency, and wavelength division multiplex communication. Color-Mixed LEDs are not only the source of intelligent lighting, but also the transmitter of high-speed visible light communication. Facing the imbalanced development of light efficiency and bandwidth of color-mixed LEDs, this project studies the frequency response characteristics of color-mixed GaN-based LEDs grown on silicon substrate. Make full use of the advantages of silicon substrate GaN-based LEDs of long-wavelength yellow-green and vertical structure chip manufacturing, building a relationship of "epitaxial technology innovation － carrier transport－carrier recombination probability and lifetime － electro-optical conversion efficiency and electro-optic response Speed ". This project proposes the academic idea of using a V-pit to shorten the carrier transport path and research the GaN-based LED epitaxial structure with low parasitic capacitance. The purpose is to study the two scientific issues of carrier lifetime and transport mechanism and the effect of parasitic effects on frequency response characteristics in GaN-based LEDs. Developed power Color-Mixed (blue, cyan, green, yellow, orange, red) LEDs with high luminous efficiency and high modulation bandwidth, providing core components for high-speed visible light communications that can meet lighting requirements, and realize industrial applications.