Sr2MgWO6:Cr3+ phosphors with effective near-infrared fluorescence and long-lasting phosphorescence

• Published in: Journal of alloys and compounds Vol. 781; pp. 473 - 478
• Main Authors: Xu, Dan-Dan, Qiu, Zi-Cong, Zhang, Qi, Huang, Li-Juan, Ye, Ying-Ying, Cao, Li-Wei, Meng, Jian-Xin
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.04.2019; Elsevier BV
• Subjects: Broadband; Cr3; Emission; Excitation spectra; Fluorescence; Gallates; Glow curves; Information storage; Long-lasting phosphorescence; Near-infrared; Phosphorescence; Phosphors; Photoluminescence; Sr2MgWO6; Thermoluminescence; Trivalent chromium; X ray powder diffraction; Long-lasting phosphorescence; Cr3; Sr2MgWO6; Near-infrared
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.12.094

Cr3+-doped near-infrared (NIR) long-lasting phosphorescence (LLP) phosphors have drawn great attention for the promising application in unique bio-labels. Most of the studies are focused on gallate materials. Here we report a novel non-gallates NIR LLP phosphor Sr2MgWO6:Cr3+ that exhibit broadband emission at 700–1000 nm. X-ray powder diffraction, photoluminescence spectra, photoluminescence excitation spectra, LLP decay curves and thermoluminescence glow curves were determined to study the NIR LLP property and mechanism of Sr2MgWO6:Cr3+. Although Sr2MgWO6:0.4%Cr3+ gives the strongest NIR emission, the optimum content of Cr3+ in Sr2MgWO6 phosphor for LLP was 0.1%. Trap type and depth in Sr2MgWO6:Cr3+ were also discussed according to the thermoluminescence glow curves. Sr2MgWO6:Cr3+ phosphor is promising in optical information storage, night-vision surveillance, and in vivo bio-imaging. •A novel double perovskite phosphor of Sr2MgWO6:Cr3+ has been synthesized by solid-state reaction in air.•The Sr2MgWO6:Cr3+ phosphor exhibit both intense near infrared (NIR) and long-lasting phosphorescence (LLP) phenomenon.•The LLP afterglow of Sr2MgWO6:0.1%Cr3+ remains observable for more than 11,000 s.•The trap type and depth were also discussed according to thermoluminescence glow curves.•The possible fluorescence and LLP mechanism in Sr2MgWO6:Cr3+ phosphors are analyzed.