On the Conversion of Solar Radiation with Fluorescent Planar Concentrators (FPCs)
Though experimental results obtained with FPCs in the visible region are encouraging, the utilization of the near infrared region of the solar spectrum is still involving great problems due to low fluorescence quantum yields of dyes, strongly overlapping bands and bad stability. Our investigation of 30 infrared laser dyes (Eastman, Lambda Physik) shows, that quantum yields decrease statistically with increasing wavelength and that they depend strongly on solvent viscosity and temperature in several cases. The suppression of radiation-less processes by deuteration of NH2-groups in oxazine dyes enhances quantum yields substantially.
Efficiency, concentration ratio and stability of collectors absorbing in the visible region could be improved.
KeywordsQuantum Yield Fluorescence Quantum Yield Solar Spectrum Internal Conversion Nile Blue
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