LED HEAT AND PHOTON EXTRACTOR

摘要

The invention concerns a semiconductor based light source comprising a back part, a front side and at least one semiconductor chip having an emitting surface, at least one reflective optical element being arranged below said at least one semiconductor chip, a material with low refractive index being disposed on a side of said reflective optical element facing said front side, wherein said semiconductor based light source comprises on said front side a compound material with high refractive index having at least one diffractive optical element embedded therein, such as to direct light incident on said diffractive optical element towards preferred directions.