TY - JOUR
T1 - Fast luminescence decay processes of photoexcited Eu3+ in CaS:Eu,La
AU - Cho, Ara
AU - Kim, So Yeon
AU - Lee, Minyung
AU - Kim, Sung Jin
AU - Kim, Chang Hong
AU - Pyun, Chong Hong
N1 - Funding Information:
This research was supported by the fund BSRI-96-3413 and by the MOST through National R&D Program for Womans Universities.
PY - 2000/11
Y1 - 2000/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0034326053&partnerID=8YFLogxK
U2 - 10.1016/S0022-2313(00)00226-X
DO - 10.1016/S0022-2313(00)00226-X
M3 - Article
AN - SCOPUS:0034326053
VL - 91
SP - 215
EP - 221
JO - Journal of Luminescence
JF - Journal of Luminescence
SN - 0022-2313
IS - 3
ER -