Integrated System Making monolithic integrated systems with GaN InGaN RGB Light-Emitting Diodes With Monolithically Integrated Photodetectors for Stabilizing Color Chromaticity Intensity-Stabilized LEDs With Monolithically Integrated Photodetectors Monolithically integrated InGaN/GaN light-emitting diodes, photodetectors, and waveguides on Si substrate Monolithic Integration of GaN-on-Sapphire Light-Emitting Diodes, Photodetectors, and Waveguides