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Phosphor‐convert (pc) near‐infrared (NIR) LED is the next‐generation smart NIR light sources. Thus, NIR phosphors are quickly developed. The K3Al1−xF6:xCr3+ (KAF:Cr3+) NIR phosphor shows broadband emission from 650 to 900 nm under 430 nm and can be used to fabricate NIR LEDs. In this work, KAF:Cr3+ phosphors were prepared by a hydrothermal method for the first time. Morphologies and NIR properties...