Broadband near-infrared luminescence of double perovskite Li3Mg2TaO6 phosphor

In this work, Li 3 Mg 2 TaO 6 :Cr 3+ phosphors were designed and synthesized by solid-phase method. Spectra show that the Cr 3+ -doped phosphors exhibit broadband emissivity in the range of 700–1200 nm, with a full width at half maximum (FWHM) of approximately 165 nm at wavelength excitation at 462 nm. The internal quantum efficiency (IQE) of phosphors is 63.1 %. Under a driving current of 270 mA, the output power of the device can achieve 36.2 mW. Combining Li 3 Mg 2 TaO 6 :Cr 3+ phosphor and a 460 nm blue chip, a near-infrared pc-LED was fabricated and demonstrated for night vision of objects, as well as rapid imaging of the veins of a fist.