With doping concentration varying from 0.1 to 5.0 mol%, a series of Dy doped calcium aluminate (CaAlO:Dy) phosphors were synthesized a sol-gel combustion technique. The phase, morphology, photoluminescence (PL), afterglow, and thermoluminescence (TL) glow curves of CaAlO:Dy were investigated by means of X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, PL spectroscopy, afterglow spectroscopy, and TL dosimetry, respectively. It is found that: (i) oxygen vacancies and Dy work as two independent sets of luminescence centers of PL for CaAlO:Dy; (ii) Dy works as the luminescence center of afterglow for CaAlO:Dy; (iii) the afterglow of CaAlO:Dy lasts for about 115 min at the optimal doping concentration of around 0.8 mol%; and (iv) multiple traps, which are sensitive to doping concentration, are present in CaAlO:Dy. The PL and afterglow mechanisms of CaAlO:Dy are discussed to reveal the processes of charged carrier excitation, migration, trapping, detrapping, and radiative recombination in CaAlO:Dy.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9641381 | PMC |
| http://dx.doi.org/10.1039/d2ra05008k | DOI Listing |
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