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Influence of Macroscopic Inclusions on Excitonic Luminescence of InSe Crystals
Author(s) -
Korbutyak D. V.,
Kryuchenko Yu. V.,
Demchina L. A.,
Litovchenko V. G.,
Sugakov V. I.
Publication year - 1986
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.2221370124
Subject(s) - luminescence , photoluminescence , polariton , exciton , impurity , materials science , condensed matter physics , doping , scattering , anthracene , molecular physics , chemistry , optics , physics , optoelectronics , photochemistry , organic chemistry
Low temperature (from 4.2 up to 30 K) photoluminescence spectra of InSe crystals containing macroscopic inclusions of neutral slightly soluble impurities (gadolinium, anthracene, fluorene etc.) are studied. The inclusions are of 0.1 to 0.5 μm in size. A substantial rise (by one or more orders in magnitude with respect to the initial spectrum of undoped crystals) of the exciton luminescence intensity is observed at relatively moderate doping doses (the impurity concentration less than 0.5 wt%) in the region of longitudinal exciton frequency ω L . To explain this effect a model is developed, which takes into account the scattering of lower branch polaritons at macroinclusions and their transformation into polaritons of the upper branch without changes in energy. The calculated temperature and frequency dependences of upper polariton branch luminescence are close to those measured experimentally despite of the practically non‐parametric way of the calculations.