کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1474494 | 991089 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Near-infrared long-lasting phosphorescence in transparent glass ceramics embedding Cr3+-doped LiGa5O8 nanocrystals Near-infrared long-lasting phosphorescence in transparent glass ceramics embedding Cr3+-doped LiGa5O8 nanocrystals](/preview/png/1474494.png)
Cr3+ doped transparent glass ceramics of SiO2–Ga2O3–Li2O were fabricated by melt-quenching and subsequent crystallization. X-ray diffraction and transmission electron microscopy analyses evidenced that cubic LiGa5O8 nanocrystals were homogeneously precipitated among the silicate glass matrix. The incorporation of Cr3+ ions into LiGa5O8 nanocrystals was evidenced by absorption, emission and time-resolved luminescence spectra. Impressively, the present Cr3+ doped glass ceramics were demonstrated to be a new near-infrared (∼720 nm) long-lasting bulk phosphor whose luminescence can last for more than 2 h after stoppage of UV (250–350 nm) irradiation. The occurring of Cr3+ long-lasting phosphorescence in the glass ceramics was confirmed to be mainly due to the precipitation of Cr3+:LiGa5O8 nanocrystals from glass matrix. The filling/releasing of electrons into/from the intrinsic traps of LiGa5O8 nanocrystals through the conduction band of host were proposed to be responsible for the realization of the long-lasting phosphorescence of the investigated Cr3+ doped glass ceramics.
Journal: Journal of the European Ceramic Society - Volume 34, Issue 15, December 2014, Pages 4069–4075