LED module

摘要

The present invention relates to a LED module which converts pump light from a LED chip (120) to light at another wavelength, which is emitted from the module. The conversion takes place in a portion of a luminescent material (124). The color purity of the LED module is enhanced by reducing any leakage of pump light using a reflector in combination with an absorber. In one embodiment, the absorber is integrated as one or several thin absorbing layers between the layers of a multi-layer reflection filter (126); this may yield an even higher reduction of pump light leakage from the module.

主权项

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.