Luminescent solar concentrators (LSCs) collect and concentrate sunlight for use in solar power generation. First proposed over 30 years ago, LSCs are simple devices, consisting of a planar waveguide coated or impregnated with a fluorophore. The fluorophore absorbs sunlight, re-emitting it into the waveguide where it travels to a device edge for conversion by photovoltaic (PV) cells. LSCs have attracted attention due to their high theoretical concentration factors, their ability to provide wavelength-to-bandgap matched photons, and because they function equally well under diffuse and direct illumination.