Study on Modulation Bandwidth and Light Extraction Efficiency of Flip-Chip Light-Emitting Diode with Photonic Crystals

摘要： In this study, the photonic crystal structure is employed to increase both the light extraction e?ciency and the modulation bandwidth of ?ip-chip GaN-based light-emitting diodes (LEDs). The ?nite di?erence time domain method is utilized to investigate the in?uence of structure of photonic crystals on the Purcell factor and light extraction e?ciency of ?ip-chip GaN-based LEDs. Simulation results show that the modulation bandwidth is estimated to be 202 MHz at current densities of 1000 A/cm2. The experimental result of modulation bandwidth is in accord with the simulation. The optical f-3dB of the device achieves 212 MHz at current densities of 1000 A/cm2 and up to 285 MHz at current densities of 2000 A/cm2. This design of photonic crystal ?ip-chip LED has the potential for applications in high-frequency visible light communication.