Micro-light-emitting-diode array with dual functions of visible light communication and illumination

作     者：黄涌 郭志友 孙慧卿 黄鸿勇 Yong Huang;Zhi-You Guo;Hui-Qing Sun;Hong-Yong Huang;Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices;Institute of the Opto-Electronic Materials and Technology, South China Normal University;Guangdong Engineering Technology Research Center of Optoelectronic Functional Materials and Devices

作者机构：Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices Institute of the Opto-Electronic Materials and Technology South China Normal University Guangdong Engineering Technology Research Center of Optoelectronic Functional Materials and Devices 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2017年第26卷第10期

页      面：490-495页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 

基　　金：supported by the Science and Technology Program Project for the Innovation of Forefront and Key Technology of Guangdong Province,China(Grant Nos.2014B010119004,2014B010121001,and 2013B010204065) the Institute of Science and Technology Collaborative Innovation Major Project of Guangzhou City,Guangdong Province,China(Grant No.201604010047) the Special Project for Key Science and Technology of Zhongshan City,Guangdong Province,China(Grant No.2014A2FC204) the Fund from the Huadu Science and Technology Bureau of Guangdong Province,China(Grant No.HD15PT003) 

主　　题：light-emitting devices optical communications diffusion capacitance 

摘      要：We demonstrate high-speed blue 4 ×4 micro-light-emitting-diode （LED） arrays with 14 light-emitting units （two light-emitting units are used as the positive and negative electrodes for power supply, respectively） comprising multiple quantum wells formed of GaN epitaxial layers grown on a sapphire substrate, and experimentally test their applicability for being used as VLC transmitters and illuminations. The micro-LED arrays provide a maximum -3-dB frequency response of 60.5 MHz with a smooth frequency curve from 1 MHz to 500 MHz for an optical output power of 165 mW at an injection current of 30 mA, which, to our knowledge, is the highest response frequency ever reported for blue GaN-based LEDs operating at that level of optical output power. The relationship between the frequency and size of the device single pixel diameter reveals the relationship between the response frequency and diffusion capacitance of the device.