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Photoluminescence and afterglow of Dy(3+) doped CaAl(2)O(4) derived via sol–gel combustion
With doping concentration varying from 0.1 to 5.0 mol%, a series of Dy(3+) doped calcium aluminate (CaAl(2)O(4):Dy(3+)) phosphors were synthesized via a sol–gel combustion technique. The phase, morphology, photoluminescence (PL), afterglow, and thermoluminescence (TL) glow curves of CaAl(2)O(4):Dy(3...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9641381/ https://www.ncbi.nlm.nih.gov/pubmed/36380955 http://dx.doi.org/10.1039/d2ra05008k |
Sumario: | With doping concentration varying from 0.1 to 5.0 mol%, a series of Dy(3+) doped calcium aluminate (CaAl(2)O(4):Dy(3+)) phosphors were synthesized via a sol–gel combustion technique. The phase, morphology, photoluminescence (PL), afterglow, and thermoluminescence (TL) glow curves of CaAl(2)O(4):Dy(3+) 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(3+) work as two independent sets of luminescence centers of PL for CaAl(2)O(4):Dy(3+); (ii) Dy(3+) works as the luminescence center of afterglow for CaAl(2)O(4):Dy(3+); (iii) the afterglow of CaAl(2)O(4):Dy(3+) 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 CaAl(2)O(4):Dy(3+). The PL and afterglow mechanisms of CaAl(2)O(4):Dy(3+) are discussed to reveal the processes of charged carrier excitation, migration, trapping, detrapping, and radiative recombination in CaAl(2)O(4):Dy(3+). |
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