High-speed integrated micro-LED array for visible light communication

In this Letter, we report high-speed integrated 14 µm in diameter micro-light-emitting diode (μLED) arrays with the parallel configuration, including 2 × 2 , 2 × 3 , 2 × 4 , and 2 × 5 arrays. The small junction area of μLED ( ∼ 191 µ m 2 ) in each element facilitates the operation of higher injection current density up to 13 k A / c m 2 , leading to the highest modulation bandwidth of 615 MHz. The optical power of 2 × 5 array monotonically increases ( ∼ 10 times higher) as the number of arrays increases (1 to 10), while retaining the fast modulation bandwidth. A clear eye diagram up to 1 Gbps without any equalizer further shows the capability of this high-speed transmitter for VLC. These results mean that tailoring the optical power of μLEDs in a parallel-biased integrated array can further enhance the data transmission rate without degradation of the modulation bandwidth.