The hydrothermally synthesis of K 3 AlF 6 :Cr 3+ NIR phosphor and its performance optimization based on phase control

作者：Qianqian Song, Zehua Liu, Hangjie Jiang, Zhaohua Luo, Peng Sun, Guoqiang Liu, Yongfu Liu, Haochuan Jiang, Jun Jiang · 发表于：Journal of the American Ceramic Society · 年份：2021 · DOI：10.1111/jace.17887 · 被引用次数：34 · 研究领域：Luminescence Properties of Advanced Materials、Advanced Photocatalysis Techniques、Perovskite Materials and Applications

Abstract Phosphor‐convert (pc) near‐infrared (NIR) LED is the next‐generation smart NIR light sources. Thus, NIR phosphors are quickly developed. The K 3 Al 1−x F 6 :xCr 3+ (KAF:Cr 3+ ) 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:Cr 3+ phosphors were prepared by a hydrothermal method for the first time. Morphologies and NIR properties are tuned by controlling the hydrothermal processes. Different from the cubic KAF:Cr 3+ synthesized by a coprecipitation method, KAF:Cr 3+ synthesized by the hydrothermal method shows the tetragonal phase. The optimized KAF:3%Cr 3+ shows an internal quantum efficiency of about 31.4%. A NIR pc‐LED device was fabricated by integrating the KAF:3%Cr 3+ phosphor with a blue LED chip (~450 nm). The output power of NIR light is about 5.5 mW driven at 150 mA.