NOVELTY - A luminescent solar concentrator (LSC) exhibiting high efficiency, and durable fluorescence properties comprises at least one plate having two major surfaces and several edges having solar cells attached to it, the plate containing a substrate selected from glass and plastic and is provided with a composite inorganic-organic sol-gel based matrix film deposited on its at least one major surface, where the film is doped with at least one luminescent dye and the concentrator containing at least three luminescent dyes of substantially different absorption ranges.    USE - As a luminescent solar concentrator (claimed).    ADVANTAGE - The luminescent solar concentrator exhibits high efficiency and durable fluorescence properties; has high concentration of light without tracking; has high collection efficiency of diffuse light; has good heat dissipation from large areas of the luminescent solar concentrator plate in contact with air, preventing unnecessary heating of the converter device, which heating is known to have deleterious effects on silicon cells; has choice of the luminescent species allows optimization of the concentrated light to the maximum spectral sensitivity of the light-converting device; and has low efficiency of solar cells exposed to white light can be circumvented by using luminescent solar concentrator as beam splitters and couple them to photovoltaic cells with optimum sensitivities in different spectral ranges, and hence use the solar spectrum in a more efficient fashion. The concentrator containing materials such as glass and plastics, minimizes thermal losses, concentrates and focus light, and protect absorbers.    DETAILED DESCRIPTION - A luminescent solar concentrator (LSC) exhibiting high efficiency, and durable fluorescence properties comprises at least one plate having two major surfaces and several edges having solar cells attached to it, the plate containing a substrate selected from glass and plastic and is provided with a composite inorganic-organic sol-gel based matrix film deposited on its at least one major surface, where the film is doped with at least one luminescent dye and the concentrator containing at least three luminescent dyes of substantially different absorption ranges and where the film has a thickness of at least 10 mu m; a diffused reflector positioned adjacent to its underside; white reflector positioned adjacent to its underside; and porous anti-reflecting coating deposited as its upper layer for diminishing the reflectance of solar light from 8-1%. The plate is provided with a composite inorganic-organic sol-gel based, fluorescent dye doped film, deposited on its both major surfaces. The luminescent dye absorbs in the solar spectrum and emits at longer wavelengths decreasing the self absorption. The luminescent dye is monomolecularly dispersed in a glymophenylsilica-polyurethane matrix film.