Journal
JOURNAL OF LUMINESCENCE
Volume 138, Issue -, Pages 83-88Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2013.01.023
Keywords
Photoluminescence; Ca2SnO4:Tb3+; Persistent luminescence; Traps
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Funding
- National Natural Science Foundation of China [21271049]
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The novel green light emitting phosphors Ca2SnO4:Tb3+ were synthesized via a traditional solid state reaction method. All as-prepared phosphors were studied systematically by X-ray diffraction, scanning micrograph images, photoluminescence spectra, decay curves, afterglow spectra and thermoluminescence glow curves. The cross-relaxation of two adjacent Tb3+ ions led to the main emission peaks locate at 483 and 545 nm under excitation of 255 nm. The CIE chromaticity coordinates are x=0.197 and y=0.279. The intensities of photoluminescence and afterglow are dependent on the concentration of Tb3+ ions. The optimal concentration of Tb3+ ions for the best afterglow characteristic was experimentally to be 0.1 mol%. After irradiation by 254 nm, the duration of afterglow can last more than 3 h. The mechanism of long afterglow in Ca2SnO4:Tb3+ is also discussed. (C) 2013 Elsevier B.V. All rights reserved.
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