Phonons and their participation in optical phenomena

Ivan Pelant and Jan Valenta

in Luminescence Spectroscopy of Semiconductors

Published in print February 2012 | ISBN: 9780199588336
Published online May 2012 | e-ISBN: 9780191738548 | DOI:
Phonons and their participation in optical phenomena

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Description of phonons and their participation in optical phenomena deals with the electron–phonon and exciton–phonon interactions, effects being crucial for understanding the luminescence processes in solids. First, basic notions related to vibrations of an ideal solid‐state lattice are reviewed, and specific properties of optical, acoustic longitudinal and transversal phonons are emphasized. Phonon dispersion curves are discussed. Then various types of the electron–phonon and exciton–phonon interactions are treated: the deformation potential, the piezoelectric mechanism, and the Fröhlich mechanism. The concept of polaron is mentioned. After characterizing briefly vibrations of a lattice containing point defects (luminescence centres), the configurational coordinate model is introduced. In its framework, the shape of absorption and emission spectra are discussed, terms Huang–Rhys factor, Debye–Waller factor, no‐phonon line, and Stokes shift are explained. The concept of thermal quenching is put in more precise terms.

Keywords: phonons; dispersion curves; exciton–phonon interaction; deformation potential; Fröhlich mechanism; polarons; configurational coordinate model; Huang–Rhys factor; no-phonon line; Debye–Waller factor

Chapter.  12141 words.  Illustrated.

Subjects: Atomic, Molecular, and Optical Physics

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