Abstract
A high-brightness Eu 2+ and Dy 3+ co-doped strontium aluminate-based transparent surface-crystallized long-lasting phosphorescent (LLP) glass-ceramic was synthesized using solid-state sintering method in CO atmosphere. The crystal structure, morphology and optical properties of the composite were characterized. By the X-ray diffraction diffusion (XRD) data, SrAl 2O 4 was demonstrated to be the crystallite in the glass-ceramic. The TEM photographs indicated that the sample had a universal small crystallite size about 10–20 nm on its surface. The SrAl 2O 4:Eu 2+, Dy 3+ crystallites were produced during the quenching process. After irradiated with ultraviolet (UV) light, the glass-ceramic emitted green long-lasting phosphorescence with an excitation peak at 375 nm and emission peak at 520 nm ascribed to the characteristic 5d–4f transition of Eu 2+. Both the PL spectra and luminance decay revealed that this phosphor had efficient luminescence and long-lasting properties. By comparing with the heat-treated sample, the obtained transparent surface-crystallized LLP glass-ceramic puts up higher transparency and long phosphorescence, and could be obtained more easily.
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