True luminescence spectra and luminescence quantum yields of molecules adsorbed on light-scattering media. Part 1.—Theory

Abstract

Based on the extended six-flux theory an expression for the intensity of light emitted by a luminescent powder sample is derived taking into account the effects of both reabsorption and re-emission. Using this formula a method is presented which enables the luminescence quantum yield and the true luminescence spectra of adsorbed molecules to be determined from diffuse reflectance and luminescence data of powdered adsorbent–adsorbates and a powdered luminescence standard.