Investigation on Luminescence Properties of a Long Afterglow Phosphor Ca2SnO4:Tm³âº.
Chem Asian J
; 10(11): 2361-7, 2015 Nov.
Article
en En
| MEDLINE
| ID: mdl-26183323
ABSTRACT
A series of new long afterglow phosphors Ca2 SnO4xTm(3+) were synthesized by using traditional solid-state reactions. XRD measurements and Rietveld refinement revealed that the incorporation of the Tm(3+) dopants generated no second phase other than the original one of Ca2 SnO4, which indicated that the dopants completely merged into the host. The corresponding optical properties were further systematically studied by photoluminescence, phosphorescence, and thermoluminescence (TL) spectroscopy. The results show that the Tm(3+)-related defects account for the bright bluish green afterglow emission from the characteristic f-f transitions of Tm(3+) ions. The bluish green long-lasting phosphorescence could be observed for 5â
h by the naked eye in a dark environment after the end of UV irradiation. Two TL peaks at 325 and 349â
K from the TL curves were adopted to calculate the depth of the traps, which were 0.45 and 0.78â
eV, respectively. The mechanism of the long afterglow emission was also explored.
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MEDLINE
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Chem Asian J
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2015
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Article