Journal
MATERIALS LETTERS
Volume 62, Issue 3, Pages 487-490Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2007.05.087
Keywords
zinc silicate; long-lasting; non-equivalent substitution; preparation
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Hf4+-doped Zn2SiO4 phosphor emitting long-lasting cyan light was prepared by the conventional high temperature solid-state technique. The emission spectrum of the Hf4+-doped phosphor exhibits one broad band peaking at 471 nm in the visible region excited by 254 nm. The cyan-light afterglow can last about 40 min in darkness after being irradiated with 254 min UV lamp for 10 min (250 mW/cm(2)). The afterglow decay curve can be fitted into a second-order exponential curve. The thermoluminescence (TL) curve shows two glow bands centered at about 386 K (0.61 eV) and 440 K (1.56 eV), respectively, with the lower trap energy level being responsible for the long-lasting afterglow emission. A possible mechanism of the long-lasting phosphorescence based on the experimental results is proposed. (c) 2007 Published by Elsevier B.V.
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