کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1651996 | 1007634 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Preparation and characterization of an Hf4+-doped zinc silicate long-lasting phosphorescent material Preparation and characterization of an Hf4+-doped zinc silicate long-lasting phosphorescent material](/preview/png/1651996.png)
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 nm UV lamp for 10 min (250 mW/cm2). 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.
Journal: Materials Letters - Volume 62, Issue 3, 15 February 2008, Pages 487–490