US Patent 11175572 Light emitting device and projector

The light emitting device includes an excitation light source, and a light emitting light source, wherein the light emitting light source includes a substrate, a photonic crystal structure which is provided to the substrate and has a light emitting layer, and an electrode configured to inject an electrical current into the light emitting layer, the excitation light source irradiates the light emitting layer with excitation light, the light emitting layer generates light due to the electrical current injected from the electrode and the excitation light, and in the photonic crystal structure, the light emitted in the light emitting layer resonates in an in-plane direction of the substrate, and a laser beam is emitted in a normal direction of the substrate.