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Synthesis of blue‐emitting AlN:Eu 2+ spherical phosphors by carbothermal reduction nitridation method
Author(s) -
Li Sen,
Zhang Jie,
Tian Zhaobo,
Yuan Xuanyi,
Du Songmo,
Wang Qi,
Cao Wenbin
Publication year - 2020
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.17050
Subject(s) - phosphor , carbothermic reaction , materials science , luminescence , impurity , photoluminescence , analytical chemistry (journal) , chemistry , optoelectronics , metallurgy , carbide , organic chemistry , chromatography
In this study, blue‐emitting AlN:Eu 2+ spherical phosphors were successfully synthesized for the first time by the carbothermal reduction nitridation (CRN) method, assisted with high nitrogen pressure, appropriate synthesis temperature, and the addition of CaF 2 . The influence of typical experimental parameters, such as N 2 pressure, heating temperature, CaF 2 content and Eu 2+ concentration on the morphologies and luminescence properties of AlN phosphors were comprehensively investigated. The formation mechanism of spherical morphology were significantly proffered, indicating that sufficient liquid Ca‐aluminates during the AlN growth stage were essential for the spheroidization process under the action of surface tension. The synthesized AlN:Eu 2+ spherical phosphors presented an intense blue emission band centered in the range of 427‐ 476 nm relative to the reaction temperature. The lifetime of AlN:Eu 2+ phosphor was calculated to be around 1.89 μs. The temperature‐dependent PL spectra suggested that the emission band did not shift until 225°C. In addition, the spectral analysis strongly suggested that the luminescence property of AlN:Eu 2+ phosphors was significantly enhanced by the large particle size, spherical morphology, reduced impurity content, and appropriate Eu 2+ concentration.