Broadband and Multimode Near-Infrared Emitter Based on Cr3+-Activated Stannate for Multifunctional Applications

Broadband near-infrared (NIR) phosphors have recently received considerable attention in spectroscopy technology fields, but designing inexpensive, emission peaks centered above 800 nm, and multimodal broadband NIR luminescence material still remains a great challenge. Here, by selecting stannate compound Mg 2 SnO 4 (MSO) as the host, a kind of broadband NIR phosphor MSO:Cr 3+ with multimode luminescence properties is reported. The designed material exhibits an emission peaking at 800 nm and a full-width at half maximum of 180 nm (≈2730 cm −1 ). The site occupation of Cr 3+ in MSO is unraveled by density functional theory calculation. The constructed NIR light-emitting device based on MSO:Cr 3+ displays a high NIR output power of 187.19 mW@100 mA and remarkable photoelectric efficiency of 13.67%, and its multifunctional applications in information encryption, non-destructive detection, and so on are also demonstrated. Additionally, through defect site reconstruction, MSO:Cr 3+ presents superior broadband NIR persistent luminescence (PersL) properties with PersL duration time longer than 50 h. This work provides a feasible strategy to develop intelligent optical material integrated with multimodal luminescence through low-cost stannate compounds as the host toward versatile applications such as non-destructive detection and bioimaging.