Enhancing Modulation Bandwidth of Parallel Micro-LED Arrays for Visible Light Communication

In this letter, parallel micro-LED arrays with numbers of ${1}\times {1}$ , ${1}\times {2}$ , ${2}\times {2}$ and ${2}\times {3}$ were fabricated and the p-electrode patterns of arrays were optimized. The results show that both the light output power (LOP) and modulation bandwidth increase with the parallel array numbers. Moreover, optimizing the p-electrode pattern can effectively facilitate current spreading, mitigate thermal crowding, and enhance the LOP. Under combined with the LOP and thermal effect, the ${2}\times {2}$ ring-electrode parallel array achieved the highest modulation bandwidth of 172 MHz and maximum LOP of 5.70 mW, which were improved by 17.28% and 13.98%, respectively. This work provides a reference to design micro-LED chip for high bandwidth.