Fluorescent planar concentrators

Abstract Fluorescent planar concentrators have been discussed in the literature for about five years. The advantages of the system are the ability to concentrate both direct and diffuse light, and variability in transparency which offers the possibility of a manifold of hybrid applications. The best total efficiency measured for electrical conversion with a stack of two plates is 4%, the highest energy concentration factor at the output edge was ten. In addition the latest results for thermal conversion are given. The highest stagnation temperatures up to now are in the range of 550°C. Theoretical calculations of the limitations on the concentration factor are presented. The lifetime of the total system could be improved, so the first commercial applications are now being planned.