Patent ID: 9082937
Filing Date: 2015-07-14
Classification: H01L,H05B

Abstract:
1. A light source, comprising a LED chip for emitting excitation light in a first wavelength range; a wavelength converter for converting excitation light to converted light in a second wavelength range; a multi-layer reflector for transmitting converted light, and for reflecting excitation light onto the wavelength converter, the reflector comprising a plurality of alternating layers of at least two different materials having at least two different indices of refraction; an absorption layer, arranged for absorbing unconverted excitation light and located between layers of the multi-layer reflector; and a separate hemispherical absorber positioned around the luminescent wavelength converter so that converted light from the luminescent wavelength converter passes through the separate hemispherical absorber at a normal angle of incidence and excitation light leaking through the multi-layer reflector passes through the separate hemispherical absorber at an oblique angle.