Improved Modulation Bandwidth of c-Plane Micro-LED Arrays by Varying Si Doping in the Quantum Barrier

Visible light communication (VLC) is animportant complementary technology to traditional radiofrequency (RF) communication due to the abundance ofavailable frequency resources and the high data rates.VLC systems are, however, constrained by the low-3 dBbandwidth of light-emitting diodes (LED) and high bit errorrates (BER). Herein, we propose a vertical-structure micro-LED array with an Si-doped first quantum barrier (FQB)that suppresses the quantum confinement Stark effect(QCSE), increasing the radiative recombination rate. Themicro-LED array exhibits an-3 dB bandwidth of 578 MHzat 2000 A/cm2when the Si doping content of the FQB is8x10(18)cm(-3). A data rate of 1.61 Gb/s with a BER of 3.51x10(-3)over the distance of 1 m free space was demon-strated using the on-off keying (OOK) modulation scheme.This work shows great potential for high-speed VLC sys-tems by proposing a simple way to improve communicationperformance