Patent ID: 8598778

Claim:
A light emitting device, comprising: a base; a light emitting diode (LED) supported by the base; a first layer spaced apart from the LED and comprising a light emitting material, the first layer having a refractive index n 1 , wherein an enclosure formed by the first layer and the base encloses the LED, and wherein a medium inside the enclosure between the LED and the first layer has a refractive index n 0 that is less than n 1 ; and an optic element in contact with the first layer and having a refractive index n 2 that is at least equal to n 1 , the first layer being positioned between the optic element and the LED, wherein the optic element has, at a surface of contact with the first layer, a radius r measured along a ray originating from the LED, and, at an output surface of the optic element, another radius R measured along the same ray originating from the LED, such that R is at least equal to r·(n 2 /n m ), wherein n m is the refractive index of a medium adjacent the output surface of the optic element, wherein a dimension of the first layer corresponds to the radius r, wherein the radius r is at least equal to √[A/(4πP)], wherein A is the surface area of the LED, and wherein P is a specified fraction of reentry.