High-Performance Tunable Near-Infrared Emitters of Cr-Activated Garnet Phosphor Enabled by Chemical Unit Co-Substitution.

The escalating demand for portable near-infrared (NIR) light sources has posed a formidable challenge to the development of NIR phosphors characterized by high efficiency and exceptional thermal stability. Taking inspiration from the chemical unit co-substitution strategy, high-performance tunable (Lu Ca)(Ga Ge)O:6%Cr (x = 0-3) phosphors are designed with an emission center from 704 to 780 nm and a broadest full width at half maximum (FWHM) of up to 172 nm by introducing Ca and Ge ions into the garnet structure. In particular, LuGaO:6%Cr demonstrates an anti-thermal quenching phenomenon (I = 113.