Efficient and ultra-broadband Cr³⁺/Ni²⁺ co-doped phosphors for light-emitting diodes with spectral output over NIR-I and NIR-II regions

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A blue-light excitable near-infrared (NIR) MgGa 2 (O,F) 4 :Cr 3+ ,Ni 2+ phosphor is developed, which exhibits an ultrabroad NIR emission from 700 to 1500 nm and an internal quantum efficiency of up to 83.3%.