We present an advanced concept for fluorescent concentrator systems, which aims for higher efficiencies by utilization of the full solar spectrum. Key features are spectrally matched solar cells, new materials and a photonic structure, which increases the fraction of light guided to the rims of the concentrator. We introduce a new method for material characterization and show first experimental results of fluorescent concentrator solar cell systems. A system with GaInP solar cells at the rims of a fluorescent concentrator and a silicon solar cell at the bottom had an efficiency as high as 17.7%, whereas the fluorescent concentrator system significantly increased total system efficiency. The application of a Rugate filter with a reflection band in the emission range of the fluorescent dye increased the internal light guiding efficiency of the concentrator by 11%.