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.
Original language | English |
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Pages (from-to) | 215-221 |
Number of pages | 7 |
Journal | Journal of Luminescence |
Volume | 91 |
Issue number | 3 |
DOIs | |
State | Published - Nov 2000 |
Bibliographical note
Funding Information:This research was supported by the fund BSRI-96-3413 and by the MOST through National R&D Program for Womans Universities.