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Multiphoton Excitation of the 520 nm Luminescence Band in MgO:Al
Author(s) -
Dunphy K.,
Duley W. W.
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.2221480233
Subject(s) - luminescence , saturation (graph theory) , excitation , laser , materials science , exciton , vacancy defect , atomic physics , optoelectronics , chemistry , optics , physics , condensed matter physics , crystallography , mathematics , combinatorics , quantum mechanics
MgO:Al crystals illuminated with pulses from a XeCl laser luminescence strongly in broad bands centered at 520 and 736 nm. The 520 nm band appears to be due to luminescence from F centers and exhibits a strong non‐linear dependence on XeCl laser intensity. On log–log plots of luminescent intensity vs. pump intensity, straight line segments with I 4 and I 6 dependence are observed, suggesting that the 520 nm emission is pumped by energy transfer from bi and tri‐excitons. Saturation of this emission at high laser flux appears to be due to electron or hole trapping at vacancy defects.