Patent ID: 7087936

Claim:
A method of forming a light-emitting device, comprising: providing a substrate that is at least partially transparent to optical radiation and has a first surface, a second surface, and a first index of refraction; forming a diode region on the first surface of the substrate that emits light responsive to a voltage applied thereto; and forming an antireflective layer on the second surface of the substrate that has a graded index of refraction having values in a range between about the first index of refraction at a first surface of the antireflective layer and about a second index of refraction corresponding to an index of refraction of an encapsulation material at a second surface of the antireflective layer; wherein the substrate comprises SiC and the antireflective layer comprises (SiC) x (SiO 2 ) 1-x or the substrate comprises Al 2 O 3 and the antireflective layer comprises (Al 2 O 3 ) x (SiO 2 ) l-x .