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The hydrothermally synthesis of K 3 AlF 6 :Cr 3+ NIR phosphor and its performance optimization based on phase control
Author(s) -
Song Qianqian,
Liu Zehua,
Jiang Hangjie,
Luo Zhaohua,
Sun Peng,
Liu Guoqiang,
Liu Yongfu,
Jiang Haochuan,
Jiang Jun
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17887
Subject(s) - phosphor , hydrothermal circulation , materials science , coprecipitation , light emitting diode , hydrothermal synthesis , phase (matter) , tetragonal crystal system , near infrared spectroscopy , analytical chemistry (journal) , optoelectronics , optics , chemistry , chemical engineering , physics , inorganic chemistry , organic chemistry , chromatography , engineering
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.