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Manifestation of Hot Phonons in the Luminescence Spectra of Highly Photoexcited A II B VI Crystals
Author(s) -
Baltramiejūnas R.,
Žukauskas A.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221490136
Subject(s) - phonon , non equilibrium thermodynamics , relaxation (psychology) , luminescence , spectral line , atomic physics , semiconductor , condensed matter physics , physics , materials science , optics , optoelectronics , thermodynamics , psychology , social psychology , astronomy
The quasi‐stationary and transient spectra of the nonequilibrium electron‐hole plasma (EHP) emission are investigated in CdSe crystals. A broadening of the low‐energy side of the luminescence band due to the heating of longitudinal‐optical (LO) phonons is established. A slow stage of the EHP energy relaxation with a time constant of 150 ps is observed and referred to the accumulation of decay products of nonequilibrium LO phonons in the narrow interval of the k ‐space. A model of the two‐stage relaxation of the phonon subsystem in a photoexcited semiconductor is used to calculate the power of energy‐loss in hot EHP and the nonequilibrium LO phonon distribution.