LED03 – RGB LED active region design and optimization with Genetic Evolution Algorithm

Multi-quantum-well (MQW) LED is a complex distributed system with strong interaction between two opposite carrier flows, electrons and holes. For both types of carriers, the carrier injection into each QW depends on transport conditions across the whole active region (AR) and is affected by capture-recombination balance in all active QWs. Multi-color LEDs with different types of QWs are especially sensitive to the details of the active region’s layout. In this work, we use genetic evolutionary analysis to design tri-color LED. We show that full RGB gamut coverage requires optimized compositional intermediate carrier blocking layers (ICBLs) separating the optically active QWs. We also show that compositional ICBLs cannot be replaced by optimized doping of quantum barriers (QBs) alone.