摘要 : The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources and emerging applications. Herein, a series of NIR emission hexafluorides A(2)BMF(6):Cr3... 展开 The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources and emerging applications. Herein, a series of NIR emission hexafluorides A(2)BMF(6):Cr3+ (A = Na, K, Rb, Cs; B = Li, Na, K, Cs; M = Al, Ga, Sc, In) peaking at approximate to 733-801 nm with a full width at half maximum (FWHM) of approximate to 98-115 nm are synthesized by a general ammonium salt assisted synthesis strategy. Benefiting from the pre-ammoniation of the trivalent metal sources, the Cr3+ can be more efficiently doped into the A(2)BMF(6) and simultaneously prevent the generation of the competitive phase. Particularly, Na3ScF6:Cr3+ (lambda(em) = 774 nm, FWHM approximate to 108 nm) with optimal Cr3+-doping concentration of 35.96% shows a high internal quantum efficiency of 91.5% and an external quantum efficiency of approximate to 40.82%. A lighting emitting diode (LED) device with a NIR output power of approximate to 291.05 mW at 100 mA driven current and high photoelectric conversion efficiency of 20.94% is fabricated. The general synthesis strategy opens up new avenues for the exploration of Cr3+-doped high efficiency phosphors, and the as-obtained record NIR output power demonstrates for NIR LED lighting sources applications. 收起