Patent ID: 8791631

Claim:
A light emitting device, comprising: a base; a light emitting diode supported by the base; a first layer spaced apart from the light emitting diode and comprising a light emitting material, the first layer having a refractive index n first — layer , wherein a gap between the light emitting diode and the first layer has a refractive index n gap that is less than n first — layer , and a transparent optic having a refractive index n optic that is greater than or equal to n first — layer , wherein the transparent optic has a first convex surface facing away from the light emitting diode and having a first radius of curvature R, the first convex surface being a surface through which the light emitting device emits light into a medium adjacent the first convex surface, the medium having a refractive index n medium , and the first layer being positioned between the transparent optic and the light emitting diode, and a second convex surface in contact with the first layer and having a second radius of curvature r, wherein r/R is equal to n medium /n optic .