A1 Refereed original research article in a scientific journal
Persistent luminescence excitation spectroscopy of BaAl2O4:Eu2+,Dy3+
Authors: Malkamäki Marja, Bos Adrie J.J., Dorenbos Pieter, Lastusaari Mika, Rodrigues Lucas C.V., Swart Hendrik C., Hölsä Jorma
Publisher: ELSEVIER
Publication year: 2020
Journal: Physica B: Condensed Matter
Journal name in source: PHYSICA B-CONDENSED MATTER
Journal acronym: PHYSICA B
Article number: ARTN 411947
Volume: 593
Number of pages: 6
ISSN: 0921-4526
eISSN: 1873-2135
DOI: https://doi.org/10.1016/j.physb.2019.411947
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/50320047
BaAl2O4:Eu2+,Dy3+ is related, both by structure and luminescence, to one of the best persistent luminescent phosphors, SrAl2O4:Eu2+,Dy3+. At room temperature (RT), the green persistent emission of BaAl2O4:Eu2+,Dy3+ remains visible for hours after ceasing irradiation. Similar to SrAl2O4, BaAl2O4 with hexagonal P6(3) structure, has two M2+ sites, but, limited optical activity from the 2nd site is observed in the emission of BaAl2O4:Eu2+,Dy3+-even at 77 K. Using combined approach of photoluminescence, thermoluminescence (TL), and persistent (excitation) luminescence measurements, the origin and properties of persistent luminescence of BaAl2O4:Eu2+, Dy3+ were studied in detail. Ultraviolet (UV) excited and persistent emission are identical and no contribution from the Eu2+ in the high-symmetry Ba site was observed. TL excitation spectra clarified the unstructured conventional excitation spectrum; now it is evident that defects or the Dy3+ co-dopant do not contribute to persistent luminescence via direct energy absorption. Mechanisms for persistent luminescence should thus be revised.
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