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Exciton Interaction in Photoluminescence from ZnO
Author(s) -
Hvam J. M.
Publication year - 1974
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.2220630210
Subject(s) - exciton , photoluminescence , excited state , luminescence , excitation , scattering , atomic physics , photoluminescence excitation , binding energy , materials science , biexciton , spectral line , emission spectrum , molecule , molecular physics , chemistry , physics , condensed matter physics , optoelectronics , optics , organic chemistry , quantum mechanics , astronomy
The luminescence spectra of ZnO platelets at 1.9 K have been investigated under 3371 Å Insor excitation from 5 to 500 kW/cm 2 . New details in the P‐band luminescence (exciton‐exciton scattering) reveal the separation between A and B excitons in ZnO and the stimulated emission in this band is found to be strong for exciton scattering to higher excited states (n > 2). At the highest excitation powers a new emission line is observed which is associated with the decay of excitonic molecules. The molecule binding energy is estimated to be 15 to 20 meV.