Cr³⁺ doped transparent glassceramics of SiO₂-Ga₂O₃-Li₂O werefabricated by melt-quenching and subsequent crystallization. X-ray diffractionand transmission electron microscopy analyses evidenced that cubic LiGa₅O₈nanocrystals were homogeneously precipitated among the silicate glass matrix.The incorporation of Cr³⁺ ions into LiGa₅O₈nanocrystals was evidenced by absorption, emission and time-resolvedluminescence spectra.Impressively,the presentCr³⁺ doped glassceramics were demonstrated to be a new near-infrared (~720 nm) long-lastingbulk phosphor whose luminescence can last for more than 2h after stoppage of UV(250~350 nm) irradiation. The occurring of Cr³⁺ long-lasting phosphorescencein the glass ceramics was confirmed to be mainly due to the precipitation of Cr³⁺:LiGa₅O₈ nanocrystals from glass matrix. Thefilling/releasing of electrons into/from the intrinsic traps of LiGa₅O₈nanocrystals through the conduction band ofhost were proposed to be responsible for the realization of the long-lasting phosphorescenceof the investigated Cr³⁺ doped glass ceramics.

J. Euro. Ceram. Soc全文链接：http://www.sciencedirect.com/science/article/pii/S0955221914003410