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

Abstract

A novel Sr2Al2SiO7:Eu[Formula: see text], Dy[Formula: see text] long-persistent luminescence (LPL) glass–ceramic has been successfully synthesized by the recrystallization-melting method in the SrO-Al2O3-SiO2-B2O3-Li2O glass system. The glass–ceramic form enhances the plasticity of the material compared to traditional Sr2Al2SiO7:Eu[Formula: see text], Dy[Formula: see text] phosphorescence powders. Additionally, the Dy[Formula: see text] ions serve a dual role as fluorescence emission centers and sensitizers for afterglow. By controlling the concentration of Dy[Formula: see text], the characteristic fluorescence intensity can be adjusted to achieve color-tunable photoluminescence. Besides, Dy[Formula: see text] ions, as trap centers, capture the electrons, resulting in a longer afterglow than the Eu[Formula: see text] singly doped sample. After exposure to ultraviolet light, the initial brightness intensity of the Dy:Eu = 16:1 sample increases to 1525 mcd/m2, and the emission lasts for 30 min. These optimized bulk materials, with unique luminous properties, have potential applications in future optoelectronic devices.