Bifunctional near-infrared-emitting phosphors of chromium (III)-activated antimonates for NIR light-emitting diodes and low-temperature thermometry

Owing to the development of near-infrared phosphor-converted light-emitting diodes (NIR pc-LED), researchers have paid lots of attention to investigating broad-band NIR phosphors. A broadband NIR phosphor of chromium (III)-doped Sr2InSbO6 (SISO: Cr3+) was comprehensively introduced in terms of X-ray diffractometer (XRD), Rietveld refinement, and X-ray photoelectron spectroscopy (XPS), electronic structure, diffuse reflection, crystal field strength, photoluminescence performances and so on. Additionally, Cr3+ was successfully incorporated into the SISO lattice by substituting the In3+ site while the critical concentration was determined to be 3 mol%. The LED device was fabricated to better identify its practical application in the field of NIR solid-state lighting. On the other hand, the decay curves were recorded in the range of 10-460 K, which is used to analyze the luminescence lifetime sensing behaviors based on the Struck and Fonger models. Especially, the favorable relative sensitivity reached 0.73% K-1 at 280 K, which is rarely affected by the doping concentration. Briefly, this work synthesized a late-model luminescent material for potential NIR low-temperature measurement and NIR night vision technology.