Carbide LED Production soon stopped when a different material, gallium nitride, showed ten–100 times brighter emission. This difference in efficiency is due to the unfavorable indirect bandgap of SiC, whereas GaN provides a direct bandgap which favors light emission. Blue light comprises high-energy photons; gallium nitride, with its wide bandgap, https://www.quora.com/profile/Trevor-Flatcher-2/Exploring-the-High-Temperature-Performance-of-Silicon-Carbide-Special-Ceramics-https-www-macrocosmmaterial-com-news-E