Patent ID: 8226263
Filing Date: 2012-07-24
Classification: G02F,H01L

Abstract:
1. An illumination system comprising: a semiconductor light-emitting device comprising a die configured to emit light of a first color and a first phosphor layer configured to pass a part of the light of the first color, to absorb a part of the light of the first color, and to emit light of a second color in response to the absorbed part of the light of the first color; and a second phosphor layer separated from the semiconductor light-emitting device and configured to absorb a part of the light of the first and a part of the light of the second color, and to emit light of a third color in response to the absorbed part of the light of the first color, wherein an output light of the illumination system comprises a combination of the first, second and third colors, and wherein the third color is substantially the same as the second color, while a wave-length spectrum of the third color is different from a wave-length spectrum of the second color.