Long-lasting near-infrared persistent luminescence from β-Ga2O3:Cr3+ nanowire assemblies

► We reported the NIR persistent luminescence in β-Ga2O3:Cr3+ nanowire assemblies. ► Phosphor exhibits more than 4 h persistent luminescence after UV irradiation. ► Trap structure and persistent luminescence mechanism of the phosphor were studied. ► β-Ga2O3:Cr3+ nanowires may find applications in security and bio-imaging.