Polychromatic luminescence of LiSr4(BO3)3:Eu2+, Dy3+ persistent phosphors. Issue 14 (15th July 2022)

• Record Type: Journal Article
• Authors: Li, Runze; Cao, Hui; Li, Huahui; Zhang, Dongyun; Chang, Chengkang
• Is Part Of: Ceramics international. Volume 48:Issue 14(2022)
• Page Start: 20546
• Page End: 20554
• Publication Date: 2022-07-15
• Subjects: Blue shift -- Red shift -- LiSr4(BO3)3 -- Afterglow; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.04.019
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A long persistent phosphor LiSr4 (BO3 )3 : Eu 2+, Dy 3+ shows a typical 5d–4f transition of Eu 2+ under ultraviolet activation with an emission centered at 632 nm. Herein, the lattice site of Sr 2+ is partially replaced with Mg 2+ and Ba 2+ and co-doping is performed using Eu 2+ and Dy 3+ to successfully synthesize several LiSr4− x Ba x (BO3 )3 :2% Eu 2+, Dy 3+ and LiSr4− y Mgy (BO3 )3 :2% Eu 2+, Dy 3+ phosphors with multicolor luminescence using a high-temperature solid-phase approach. When x or y = 0.4, the samples exhibit bright yellow or orange–red luminescence under ultraviolet (UV) excitation, with the emission spectra showing blue (611–632 nm) or red (632–648 nm) shifts, respectively. Such shifts in the peak position are ascribed to the weakened or enhanced crystal field strength. Under UV excitation, an afterglow phenomenon is also observed. The afterglow profiles can be simulated using an empirical double decay model. The LiSr3.76 Mg0.2 (BO3 )3 : 2% Eu 2+, Dy 3+ sample exhibits the best afterglow phenomenon, which is potentially attributed to the formation of numerous electron traps with suitable trap depths after the incorporation of Mg 2+ into the phosphor lattice.