NOVELTY - The solar concentrator comprises a glass substrate, an inorganic light-absorbing chromophore disposed in the glass substrate, an inorganic luminescent chromophore disposed in the glass substrate, and a lower refractive index medium adjacent to the front or rear surfaces of the substrate such that the luminescent light emitted by the inorganic luminescent chromophore is refracted at an interface between the substrate and the lower refractive index medium. The inorganic light absorbing chromophore is capable of absorbing a wavelength of optical radiation.    USE - The solar concentrator is useful for concentrating and communicating lower energy light than sunlight to a solar cell.    ADVANTAGE - The solar concentrator exhibits high concentration factors without active cooling or high-accuracy mechanical tracking, has the ability to receive and concentrate diffuse light without requiring solar tracking thus it is cost-effective, and has improved energy transfer efficiency and re-absorption property.    DETAILED DESCRIPTION - The solar concentrator comprises a glass substrate, an inorganic light-absorbing chromophore disposed in the glass substrate, an inorganic luminescent chromophore disposed in the glass substrate, and a lower refractive index medium adjacent to the front or rear surfaces of the substrate such that the luminescent light emitted by the inorganic luminescent chromophore is refracted at an interface between the substrate and the lower refractive index medium. The inorganic light absorbing chromophore is capable of absorbing a wavelength of optical radiation. The inorganic luminescent chromophore is luminescent in a spectral band that is absorbed by the solar cell in response to absorption of the optical radiation by the inorganic light-absorbing chromophore. The luminescent light is directed to a solar cell. The medium of lower refractive index is air or viscous. The inorganic light-absorbing chromophore comprises lead sulfide quantum dots.    DESCRIPTION OF DRAWING(S) - The figure shows a luminescent light guide.    Chromophores (110)    Solar cell (120)    Solar radiation (122)    Light absorbing material (144)    Substrate. (148)