Low index spacer layer in LED devices

摘要: A light emitting diode (LED) device having a low index of refraction spacer layer separating the LED chip and functional layer. The has textured emission surface to increase extraction from chip. an that is lower than both Most generated in passes easily into due At interface sees step-up which facilitates transmission. portion passed will be reflected or scattered back toward where some it experience total internal reflection. Total reflection at this may efficiency by reducing amount re-enters and, ultimately, absorbed. also provides thermal buffer between Thus, layer, wavelength conversion comprising phosphors, for example, insulated direct transfer can function as passivation