Highly Efficient and Thermally Stable NIR‐Emitting Phosphor with Largely Tunable Peak Wavelength and Bandwidth Toward NIR Spectroscopy Applications

Abstract Developing tunable broadband near‐infrared (NIR) fluorescent materials with outstanding luminescence properties and superior thermal robustness remains a significant challenge for next‐generation intelligent NIR light sources. Herein, a high‐performance large‐scale tunable NIR‐emitting garnet‐type phosphor, SrLu 2 Al 3 ScSiO 12 :Cr 3+ (SLASSO:Cr 3+ ), is presented. Upon 450 nm blue light excitation, SLASSO:1%Cr 3+ phosphor yields a broadband emission with full width at half maximum of 108 nm and a prominent sharp peak at 694 nm superimposed on a broadband radiation, which is attributed to the co‐occupation of Cr 3+ ions at the dominant [AlO 6 ] octahedral site (Cr1 site) and subordinate [ScO 6 ]…