Patent ID: 11268676

Abstract:
A light-emitting device assembly includes a concave optical collector, a light-emitting device, and a light-escape surface. The collector redirects incident light by reflection, scattering, or reradiation. The light-emitting device emits device output light to propagate within the optical collector. The light-escape surface extends across an open end of the collector and exhibits (i) incidence-angle-dependent transmission of light that decreases with increasing incidence angle, or (ii) transmissive redirection of light to propagate at an angle less than a corresponding refracted angle, that are imparted by an array of nano-antennae, a partial photonic bandgap structure, a photonic crystal, an array of meta-atoms or meta-molecules, or a multi-layer dielectric thin film. Assembly output light transmitted by the light-escape surface includes first and second portions of the device output light that propagate within the collector without and with redirection, respectively, within the collector by the light-escape surface.