Fluorescence Quantum Efficiency Of Flat Panel Luminescence Solar Concentrator Material

The relaxation of a few typical orange and red absorbing dyes in PMMA ( polymethylmetacrylate ) is studied by compensation photocalorimetry and picosecond fluorescence spectroscopy. At ambient temperature the orange dyes have a fluorescence quantum efficiency of close to unity and they decay monoexponentially. The red dyes have lower efficiencies and their decay can be described by two exponentials. This decay kinetic is not in agreement with the model of dipol-dipol mediated intramolecular fluorescence quenching.