Journal
JOURNAL OF LUMINESCENCE
Volume 132, Issue 11, Pages 3066-3071Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2012.06.023
Keywords
Dysprosium; Molten chlorides; Fluorescence; Absorption; Hypersensitivity
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Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2012-0005386]
- EEWS Research Project of the office of KAIST EEWS initiative [EEWS-2012-N01120021]
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The spectroscopic properties of Dy(III) in molten LiCl-KCl eutectic salt at high temperature were investigated by time-resolved laser fluorescence spectroscopy (TRLFS) and UV-vis absorption spectroscopy. For the first time, a visible fluorescence of Dy(III) in high-temperature LiCl-KCl eutectic salt was measured due to the electronic transitions from I-4(13/2) and F-4(9/2) to H-6(J/2) (J=7, ... , 15). The effect of temperature on hypersensitivity for the electronic transitions from the I-4(13/2) excited state (similar to 25700 cm(-1)) of Dy(III) was confirmed by altering temperature in chloride eutectic salt in accord with optical absorption measurements. The molar absorptivity of I-4(13/2) <- H-6(15/2) was enhanced with increasing temperature. The fluorescence intensity of Dy(III) followed a simple mono-exponential decay curve, suggesting the formation of a single chemical species in high-temperature LiCl-KCl molten salt. (C) 2012 Elsevier B.V. All rights reserved.
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