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Sensitized luminescence of pure and doped NaNO 2 single crystals. I. Stationary spectra
Author(s) -
Lisse F.,
Köhlre J.,
Pufahl H.,
Schmid D.
Publication year - 1987
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.2221400231
Subject(s) - impurity , luminescence , phosphorescence , spectral line , ionic bonding , doping , analytical chemistry (journal) , fluorescence , phonon , emission spectrum , materials science , chemistry , ion , condensed matter physics , optics , physics , optoelectronics , organic chemistry , astronomy
The fluorescence and phosphorescence spectra of pure NaNO 2 and of NaNO 2 doped with KNO 2 (up to about 2 × 10 −3 mol KNO 2 /mol NaNO 2 ) are investigated. Compared to the fluorescence spectra of pure crystals ten progressions of impurity‐induced lines are identified in the spectra of the doped crystals. The origin and the generating frequencies of these progressions are determined carefully, as well as the temperature and concentration dependence of their relative intensities with respect to those observed in pure crystals. A comparison of the shapes of impurity‐induced and unperturbed lines shows a striking difference: The unperturbed “zero‐phonon” lines (electronic transitions into intra ionic vibrational levels of the NO 2 − without participation of inter ionic phonons) exhibit a pronounced asymmetry. The impurity‐induced lines, as well as the lines which are due to isotopically substituted NO 2 − are considerably narrower and Lorentzian shaped. A discussion of these observations will be presented in Part II.