Luminescence characteristics of ultra-broadband near-infrared emission Li3Mg2SbO6:Cr3+ phosphors and their applications in light-emitting diodes

In this study, a Li 3 Mg 2 SbO 6 :Cr 3+ phosphor was prepared by high-temperature solid-phase reaction. The phosphors doped with 0.03Cr 3+ showed broadband emission at 805 nm, a wide spectral band of 200 nm at 435 nm excitation, an internal quantum efficiency of 80.8%, and the integrated emission intensity at 423 K of Li 3 Mg 2 SbO 6 :Cr 3+ is about 50% of that at room temperature . The phosphors conversion (pc) - light-emitting diodes (LEDs) with broadband near-infrared (NIR) emission were prepared using the Li 3 Mg 2 SbO 6 :Cr 3+ phosphor coating on blue LED chips. They achieved 10.4% photoelectric efficiency and 60.2 mW NIR output power at 210 mA. All results showed that the Li 3 Mg 2 SbO 6 :Cr 3+ phosphors had considerable potential in NIR spectroscopy applications.