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Abstract 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 Sr 2 MgWO 6 :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 Sr 2 MgWO 6 :Cr3+. Although Sr 2 MgWO 6 :0.4%Cr3+ gives the strongest NIR emission, the optimum content of Cr3+ in Sr 2 MgWO 6 phosphor for LLP was 0.1%. Trap type and depth in Sr 2 MgWO 6 :Cr3+ were also discussed according to the thermoluminescence glow curves. Sr 2 MgWO 6 :Cr3+ phosphor is promising in optical information storage, night-vision surveillance, and in vivo bio-imaging. Highlights • A novel double perovskite phosphor of Sr 2 MgWO 6 :Cr3+ has been synthesized by solid-state reaction in air. • The Sr 2 MgWO 6 :Cr3+ phosphor exhibit both intense near infrared (NIR) and long-lasting phosphorescence (LLP) phenomenon. • The LLP afterglow of Sr 2 MgWO 6 :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 Sr 2 MgWO 6 :Cr3+ phosphors are analyzed. [ABSTRACT FROM AUTHOR]