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Quenched‐in Photoluminescent Color Centers in NaI
Author(s) -
Fontana M. P.,
van Sciver W. J.
Publication year - 1970
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.19700370142
Subject(s) - luminescence , photoluminescence , quenching (fluorescence) , stoichiometry , analytical chemistry (journal) , excitation , materials science , iodine , vacancy defect , liquid nitrogen , absorption (acoustics) , fluorescence , quantum efficiency , absorption spectroscopy , single crystal , crystal (programming language) , chemistry , crystallography , optics , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , metallurgy , composite material , programming language , computer science
Crystals of NaI, KI, and KCl have been quenched from temperatures as high as 450 °C by rapid immersion in liquid nitrogen. In the case of NaI, very strong absorption bands at 255 nm (Q 1 ) and 226 nm (Q 2 ) may be produced by quenching the crystal from about 360 °C. The excitation spectrum for a characteristic luminescence at 375 nm, is identical, within the limits of experimental accuracy, with bands produced by stoichiometric excess iodine. Similar results were obtained for quenched KI, although the luminescent quantum efficiency was smaller. Negative results were obtained for quenched KCl. Analysis of the observed properties leads to the conclusion that the defect responsible for the 375 nm luminescence is, or is related to, the single cation vacancy.