Structural luminescence spectra of biogenous porphyrins under selective laser excitation and dependence of this effect on excitation wavelength

Selective laser excitation removes an inhomogeneous width in wideband luminescence spectra of solid solutions of biogenous porphyrins resulting in spectra consisting of narrow zero-phonon lines and phonon sidebands. The effect depends strongly on excitation frequency and disappears gradually upon increasing this frequency within the inhomogeneously broadened pure electronic transition band.