Carbide LED Production soon stopped when a different material, gallium nitride, showed 10–one hundred times brighter emission. This difference in efficiency is because of the unfavorable indirect bandgap of SiC, whereas GaN contains a direct bandgap which favors light emission. This is possible because they have a larger band width, https://www.quora.com/profile/Trevor-Flatcher-2/Advantages-of-Silicon-Carbide-Materials-in-High-Temperature-Electronic-Devices-Silicon-carbide-SiC-has-emerged-as-a-c