NOVELTY - A photovoltaic (PV) system (200) comprises greater than or equal to 1 solar receptors (50) and greater than or equal to 1 solar concentrators (100) maintained in a fixed position relative to solar receptors and consist of light-guiding slab (110), spaced-apart outcoupling structures (130), and optical elements (140). Light-guiding slab has a light transparent material with opposing parallel 1st and 2nd broadside surfaces and luminescent material (120) capable of absorbing sunlight with a 1st wavelength within a 1st wavelength range and generating light emissions with 2nd wavelength within a 2nd wavelength range.    USE - A photovoltaic (PV) system (claimed).    ADVANTAGE - Reabsorption of light emissions is reduced, problems associated with extracting light emissions along the side edge of the light-guiding slab are avoided, light-guiding slab is protected from accumulated dust and wear, and manufacturing cost is reduced.    DETAILED DESCRIPTION - A photovoltaic (PV) system (200) comprises greater than or equal to 1 solar receptors and greater than or equal to 1 solar concentrators (100) maintained in a fixed position relative to solar receptors (50) and consist of light-guiding slab (110), spaced-apart outcoupling structures (130), and optical elements (140). Light-guiding slab has a light transparent material with opposing parallel 1st and 2nd broadside surfaces and luminescent material (120) capable of absorbing sunlight with a 1st wavelength within a 1st wavelength range and generating light emissions with 2nd wavelength within a 2nd wavelength range and being longer than 1st wavelength, wherein 1st and 2nd broadside surfaces are formed, and light transparent material is selected such that when sunlight enters the light-guiding slab and causes luminescent material to produce light emissions, at least some of the energy emissions are retained within the light-guiding slab by total internal reflection off of portions of 1st and 2nd broadside surfaces. Each outcoupling structure is disposed on a corresponding outcoupling region of 1 of the broadside surfaces and has a low-absorption, light scattering material disposed on corresponding outcoupling region such that retained light emission is redirected by each outcoupling structure out of the light-guiding slab. Optical elements are fixedly secured to light-guiding slab, and each optical element is arranged relative to an associated outcoupling structure such that at least some of the light emissions is directed into the associated optical element, wherein each optical element is formed such that the light emissions are redirected by the associated optical element in a predetermined direction toward greater than or equal to 1 of the solar receptors. An INDEPENDENT CLAIM is included for a module for a photovoltaic (PV) system.    DESCRIPTION OF DRAWING(S) - The drawing shows a simplified side view of a PV system including a solar concentrator.    Solar receptors (50)    Solar concentrators (100)    Light-guiding slab (110)    Luminescent material (120)    Outcoupling structures (130)