High-efficiency continuous multiple-quantum-well red AlGaInP μLED with reduced crosstalk for AR light engines

We develop both electrical and optical models to optimize the light efficiency and minimize the crosstalk of continuous multiple-quantum-well (CMQW) red AlGaInP μLED with a 2.4-μm pixel size for augmented reality (AR) applications. Our simulation results agree with the reported experimental data well. We also analyze the physical mechanisms and propose two methods to improve light extraction efficiency (LEE). By redirecting the reflected wave and implementing meta-atoms in the device structure, the LEE of CMQW red AlGaInP μLED is improved by ~30% while suppressing the crosstalk between adjacent pixels. In addition, by implementing a carbon black matrix, the crosstalk is reduced by ~5x while keeping a relatively high efficiency. As a result, the image blur is alleviated, and image quality is significantly improved. These high-efficiency red μLEDs will help reduce the power consumption of emerging full-color AR glasses.