Method to measure the refractive index for photoluminescence modelling

Light emission by fluorophores can be computed from the knowledge of the absorption spectrum. However, at long wavelengths, the calculated emission may diverge if the decay of the imaginary part of the permittivity is not modelled with precision. We report a technique to obtain the permittivity of fluorophores such as dye molecules from fluorescence measurements. We find that the Brendel-Bormann model enables to fit the emission spectra accurately.

Automated summary

This article presents a technique to obtain the permittivity of fluorophores, such as dye molecules, from fluorescence measurements. The Brendel-Bormann model is found to accurately fit the emission spectra.