GaN-Based High-Response Frequency and High-Optical Power Matrix Micro-LED for Visible Light Communication

Abstract

Light-emitting diodes (LEDs) with high response frequency and high power can be applied in visible light communication (VLC). This letter studies the response frequency and optical output power of the gallium nitride (GaN) based matrix micro-LED ( $\mu $ LED) for visible light communication. The blue-emitting GaN $\mu $ LEDs with the format from ${1}\times {1}$ to ${6}\times {6}$ are fabricated and used to analyze the relationship between the matrix format and the response frequency, as well as the output optical power and the data transmission performance of the matrix $\mu $ LED. The experimental and analysis results show that the GaN-based matrix $\mu $ LED response frequency can be improved by an increase in the injection current density increased and a decrease in device capacitance. The experimental comparison result indicates that the −3 dB response frequency changed from 85 MHz to 401 MHz at a 60 mA injection current progressively increased as the matrix array size from ${1}\times {1}$ to ${6}\times {6}$ , the ${6}\times {6}$ matrix $\mu $ LED optical output power reaches a value of 356.7 mW.