The dual role of Dy3+ in a novel Sr2Al2SiO7:Eu2+, Dy3+ long-persistent luminescence glass-ceramic

A novel Sr2Al2SiO7:Eu2+, Dy3+ long-persistent luminescence (LPL) glass-ceramic has been successfully synthesized by the recrystallization-melting method in the SrO-Al2O3-SiO2-B2O3-Li-2 O glass system. The glass-ceramic form enhances the plasticity of the material compared to traditional Sr2Al2SiO7:Eu2+, Dy3+ phosphorescence powders. Additionally, the Dy3+ ions serve a dual role as fluorescence emission centers and sensitizers for afterglow. By controlling the concentration of Dy3+, the characteristic fluorescence intensity can be adjusted to achieve color-tunable photoluminescence. Besides, Dy3+ ions, as trap centers, capture the electrons, resulting in a longer afterglow than the Eu2+ singly doped sample. After exposure to ultraviolet light, the initial brightness intensity of the Dy:Eu = 16:1 sample increases to 1525 mcd/m(2), and the emission lasts for 30 min. These optimized bulk materials, with unique luminous properties, have potential applications in future optoelectronic devices.