可见光通信用GaN基LED调制带宽提升研究与挑战

Improving the Modulation Bandwidth of GaN-Based LightEmitting Diodes for High-Speed Visible Light Communication: Countermeasures and Challenges

摘要:

可见光通信(VLC)作为一种无线通信方式，已引起广泛关注。GaN基发光二极管(LED)的普及也为VLC的应用奠定了坚实的基础。LED作为VLC的光源，其调制带宽直接决定了通信的速度。本文综述了GaN LED发射端调制带宽改善方案的研究进展，涵盖了从外延到器件的各个方面。外延方法包括c极面外延优化、非/半极面外延生长以及芯片方案，如micro-LED、nano-LED、谐振腔LED (RC-LED)、等离激元和微腔LED。在白光LED方面，综述了解决传统荧光粉Stokes转换慢、载流子寿命长的方法，包括新型色转换层材料(CCMs)和新的能量传输途径。本综述推动了高速VLC用GaN基LED光源器件的发展。

Abstract:

Visible light communication (VLC), as a wireless communication method, has attracted wide attention. The popularity of GaN-based light emitting diode (LED) has also laid a solid foundation for the application of VLC. LED as the light source of VLC, its modulation bandwidth directly determines the speed of communication. This paper reviews the research progress of modulation bandwidth improvement schemes for GaN LED transmitters, covering all aspects from epitaxial to device. Epitaxial methods include c-polar epitaxial optimization, non / semi-polar epitaxial growth and chip schemes, such as micro LED, nano LED, resonant cavity LED (RC-LED), plasma exciton and supercavity LED. In terms of white LED, the methods to solve the slow Stokes transmission and long carrier lifetime of traditional phosphors are reviewed, including new color conversion layer materials (CCMs) and new energy transmission routes. This review promotes the development of GaN-based LED as a high-speed VLC transmitter.