A didactic model of solvent shifts, inhomogeneous broadening, and linear and quadratic electron–phonon coupling

A simplified model of optical spectra of chromophores embedded in disordered solids is proposed. Using the repulsive–dispersive potentials of the ground state and the excited state in Lennard–Jones form the expressions are obtained for inhomogeneous site energy distribution function, and the linear...

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Bibliographic Details
Published in:Journal of luminescence 2007-11, Vol.127 (1), p.1-6
Main Author: Renge, Indrek
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic spectra
Electron–phonon coupling
Exact sciences and technology
Glasses
Inhomogeneous broadening
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Physics
Spectral hole burning
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Summary:A simplified model of optical spectra of chromophores embedded in disordered solids is proposed. Using the repulsive–dispersive potentials of the ground state and the excited state in Lennard–Jones form the expressions are obtained for inhomogeneous site energy distribution function, and the linear and quadratic coupling strength of electronic transition to local phonons. Experimentally, the shift of spectral holes was studied for chlorin in polymer hosts at temperatures between 5 and 40 K and by applying hydrostatic He gas pressure up to 200 bar. The opposite frequency dependencies of line shifts induced by temperature and pressure are in agreement with the model, if the potential minimum of the excited state is shifted to a shorter distance.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2007.02.009