Near-infrared emitting persistent phosphors are extensively studied for in vivo bioimaging and security applications. In the past few years, red to near-infrared persistent phosphors activated by transition metals or rare earth ions received much attention. However, the depletion of natural resources of rare earths and the associated toxicity also incited researchers to explore the rare earth free NIR phosphors. Defect-related luminescent materials are emerging as potential alternative candidates of rare earth doped phosphors with many additional advantages such as more cost-effective due to containment of earth abundant elements, low toxicity, stability, and tunability of emission color by modulating defect centers. Various trap states created by the lattice defects play critical roles of light emitting centers. In present case, we have synthesized MgAl<sub>2</sub>O<sub>4</sub> as a rare earth free and inexpensive NIR light emitting materials via co-precipitation and molten salt synthesis method. The compound exhibited strong NIR emission around 724 nm. Further, we have tried to control the defect centers by co-doping aliovalent ion to improve the NIR light yield and make its luminescence persistent.

Development of defect related NIR emitting phosphors for in vivo bioimaging applications

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