Patent ID: 8304796
Filing Date: 2012-11-06
Classification: H01L

Abstract:
1. A light-emitting apparatus comprising: a substrate; a plurality of light-emitting devices formed on the substrate and each comprising a first electrode formed on the substrate, an emission layer formed on the first electrode, and a second electrode formed on the emission layer; a cavity structure for resonating light emitted from the emission layer between a first reflective surface and a second reflective surface; and a periodic structure for extracting guided-wave light generated between the first reflective surface and the second reflective surface to outside, wherein when the guided-wave light is diffracted by the periodic structure at an angle which is larger than 90° and smaller than 180° relative to a guided-wave direction, a wavelength of the diffracted light becomes longer as the angle increases, wherein primitive reciprocal lattice vectors b1, b2 of the periodic structure satisfy:  and wherein n is a refractive index of the emission layer, n