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Room Temperature Investigation of the Photostimulated Afterglow in KCl:Eu 2+ Crystals
Author(s) -
Vassilev Y.,
Karamikhailova M.,
Mladenova M.,
Georgiev M.
Publication year - 1980
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.2221000210
Subject(s) - afterglow , excited state , luminescence , atomic physics , photoexcitation , impurity , laser , ion , phosphorescence , quantum tunnelling , excitation , irradiation , materials science , chemistry , analytical chemistry (journal) , fluorescence , optoelectronics , physics , optics , gamma ray burst , organic chemistry , quantum mechanics , astronomy , nuclear physics , chromatography
KCl:Eu 2+ , γ‐irradiated at room temperature, is known to luminesce on photoexcitation in the F band with the emission spectrum of the impurity ion. Several experiments are made now: firstly, the emission—excitation spectrum is found to exhibit a peak at about 600 nm. Secondly, the samples are excited with the SH of a mode‐locked Nd glass laser. The maximum emission response occurs delayed at about 400 ns relative to the laser‐pulse peak. The luminescent quantum yield is estimated to be about 1%. The decay kinetics of the phosphorescent tail is also followed. A tentative model is discussed in which the luminescence results from a two‐step electron tunneling between excited F and Eu levels.
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