Shanghai University researchers have designed a blue-green light micro-LED for Augmented Reality Heads-up Displays (AR-HUD) using COMSOL software, coupling photo-thermal properties with multi-physical fields. By incorporating a graphene film and heat sink for heat dissipation, the thermal management scheme of the micro-LED was further optimized.
The effect of graphene film thickness on heat dissipation performance was investigated, with the aim to improve photoelectric conversion efficiency and reduce the impact of high junction temperature on device reliability and performance.
The main factors affecting the performance of a thin graphene emitter are the source power input and the source-emitter contact area ratio—thermal performance varies most with increasing power input and decreasing area ratio. Additionally, solar radiation’s role is considered; the solar energy density determines the reverse solar scattering effect on the micro-LED module.
Research shows that when sunlight enters the micro-LED, surface radiation increases dramatically, helping to address the problem of sunlight backflow.
The Shanghai University team further explored the use of graphene heat dissipation films on micro-LED devices to optimize the thermal management scheme, enhance photoelectric conversion efficiency, and minimize the effect of high junction temperature on device reliability. They also studied the impact of solar radiation, confirming that direct sunlight dramatically increases the device’s surface radiation and provides crucial insights for resolving sunlight backflow in micro-LEDs.
