The energetic aspect, discussed by the means of the chemical potential, involved into the absorption and radiation processes occurring in the operation of Fluorescent Solar Collectors is of interest in this publication. The chemical potential of the fluorescent light incident on the solar cell is characterised by studying the fluorescence spectrum emitted by a special type of fluorescent collector, where absorption and fluorescence take place in a liquid medium, in effect a liquid fluorescent collector. It is shown that photon re-absorption (known also as photon recycling) gradually brings the emitted photon flux into thermal equilibrium with the collector. The fluorescence photon distribution is then characterised by a specific temperature, obtained from the Kennard-Stepanov law, and a chemical potential given by the generalised Plank’s law. We find that the chemical potential of the fluorescent light incident on the solar cell is nearly equal to the thermodynamical limits imposed by a detailed balance argument. This equality indicates that non radiative losses do not affect the chemical potential of the light escaping from the collector, a major benefit in comparison to simple semiconductor based solar cells where non-radiative losses significantly affect the open circuit voltage
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