Journal article
Probing metastable Sm2+ and optically stimulated tunnelling emission in YPO4: Ce, Sm
When the model dosimetry system YPO4: Ce3+, Sm3+ is exposed to X-rays, the charge state of the dopants changes, becoming Ce4+ and Sm2+ via hole and electron trapping, respectively which are metastable; the original charge states can be achieved through electron transfer back from Sm2+ to Ce4+ via optical stimulation.
The work presented here adds further details to the energy levels of the metastable Sm2+ defect and the electron transfer processes by undertaking measurements of a) Sm2+ excitation spectrum through the internal 5D0 → 7F2 emission at 7 K, b) relaxation lifetime of Sm2+ (5D0 state) and its temperature dependence to provide insights into thermal quenching, and c) the kinetics of localised recombination from Sm2+ to Ce4+ on nanoseconds to seconds time scales using sub-band-edge excitation.
Language: | English |
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Year: | 2017 |
Pages: | 61-66 |
ISSN: | 18790925 and 13504487 |
Types: | Journal article |
DOI: | 10.1016/j.radmeas.2016.11.012 |
ORCIDs: | Prasad, Amit Kumar , Kook, Myung Ho and Jain, Mayank |