Broadband short-wave near-infrared-emitting phosphor MgNbO:Cr for -LED applications.

Broadband short-wave near-infrared (NIR) phosphor-converted light-emitting diodes (-LEDs) have been attracting keen interest for miniature NIR spectroscopy, while still lacking sufficient novel broadband NIR-emitting phosphors. Herein, we report a novel MgNbO:Cr polycrystalline phosphor with a broad NIR emission band centered at 970 nm and a large full-width at half-maximum of approximately 155 nm under excitation of bluish-green light at around 515 nm. The optimized phosphor MgNbO:1%Cr features a high internal quantum efficiency (IQE) of ∼85.

Interstitial Li Occupancy Enabling Radiative/Nonradiative Transition Control toward Highly Efficient Cr-Based Near-Infrared Luminescence.

Highly efficient and stable broadband near-infrared (NIR) emission phosphors are crucial for the construction of next-generation smart lighting sources; however, the discovery of target phosphors remains a great challenge. Benefiting from the interstitial Li occupancy-induced relatively large distorted octahedral environment for Cr and suppressed nonradiative relaxation of the emission centers, an NIR emission fluoride phosphor NaGaF:Cr,Li peaking at 758 nm with a high internal quantum efficiency of 95.8% and an external quantum efficiency of 38.