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Fast luminescence decay processes of photoexcited Eu3+ in CaS:Eu,La

Title
Fast luminescence decay processes of photoexcited Eu3+ in CaS:Eu,La
Authors
Cho A.Kim S.Y.Lee M.Kim S.-J.Kim C.-H.Pyun C.-H.
Ewha Authors
김성진이민영
SCOPUS Author ID
김성진scopus; 이민영scopus
Issue Date
2000
Journal Title
Journal of Luminescence
ISSN
0022-2313JCR Link
Citation
vol. 91, no. 3, pp. 215 - 221
Publisher
Elsevier Science Publishers B.V., Amsterdam, Netherlands
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Decay dynamics of photoexcited Eu ions in CaS:Eu and in CaS:Eu,La were studied by employing time-resolved luminescence spectroscopy. For the first time, subnanosecond decay process of Eu3+ luminescence was observed in solid matrices. The obtained decay times of Eu3+ in CaS:Eu,La were 4.3 ns at 298 K and 0.38 ns at 77 K, demonstrating much faster non-radiative decay at the lower temperature. The overall intensities of the emission spectra at 298 K were three times stronger than that at 77 K. The formation of Eu3+-La3+ pairs in CaS:Eu,La accounts for observed dependence of fast decay time and intensity on the temperature. The decay time of Eu2+ both in CaS:Eu and CaS:Eu,La was observed to be approximately 560 ns.
DOI
10.1016/S0022-2313(00)00226-X
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자연과학대학 > 화학·나노과학전공 > Journal papers
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