Near-infrared long-lasting phosphorescence in transparent glass ceramics embedding Cr3+-doped LiGa5O8 nanocrystals |
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| Affiliation: | 1. School of Mechanical & Electrical Engineering, Mianyang Teachers’ College, Mianyang 621000, PR China;2. Department of Material Science, Sichuan University, Chengdu 610064, PR China;3. Research Center of Computational Physics, Mianyang Teachers’ College, Mianyang 621000, PR China;1. Xiamen University of Technology, Xiamen 361024, China;2. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;1. Institut de Recherche de Chimie-Paris, CNRS-Chimie ParisTech, 11 rue Pierre et Marie Curie, 75005 Paris, France;2. Department of Physics, Goa University, Goa 403206, India;1. Department of Chemical Engineering, Konkuk University, Seoul 143-701, Republic of Korea;2. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar- 522 510, India;3. Department of Physics, Government College for Men (A), Kadapa 516 004, India;4. Department of Physics, Sri Venkateswara University, Tirupati 517 502, India;1. School of Mathematics & Physics, Mianyang Teachers'' College, Mianyang, 621000, PR China;2. Department of Material Science, Sichuan University, Chengdu, 610064, PR China |
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| Abstract: | 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. |
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| Keywords: | Optical materials Glass ceramics Nanocrystals Luminescence |
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