High temperature stability of Eu2+-activated nitride red phosphors
来源期刊：JOURNAL OF RARE EARTHS2014年第1期
论文作者：胡运生 庄卫东 何华强 刘荣辉 陈观通 刘元红 黄小卫
文章页码：12 - 16
摘 要：The novel nitride-based luminescent materials have received much attention since the end of the last century. In this paper, the commercial Eu2+-activated nitride red phosphors, Sr1.95 Si5 N8 :Eu0.05, Sr1.85 Si5 N8 :Eu0.15 and Ca0.99 AlSiN3 :Eu0.01 phosphors were annealed at different temperatures（beyond 300 oC） to investigate the dependence of their luminescence performance and structure variability on the temperature. By photoluminescence spectra, X-ray diffraction（XRD） and thermogravimetry-differential scanning calorimetry（TG-DSC） analysis, the high temperature stability of the hosts and activator of the three samples were disclosed. With the annealing temperature increasing, the activator Eu2+ions were firstly oxidized and then host in Sr1.95 Si5 N8 :Eu0.05 and Sr1.85 Si5 N8 :Eu0.15, but for Ca0.99 AlSiN3 :Eu0.01, only the oxidation of the host could be observed, which would lead to the luminescence degradation and even failure of these phosphors. The activator Eu2+ions were much more stable in CaAlSiN3 :Eu than Sr2 Si5 N8 :Eu due to their crystal surroundings, and its concentration also influenced the temperature stability of Sr2 Si5 N8 :Eu.
胡运生，庄卫东，何华强，刘荣辉，陈观通，刘元红，黄小卫
National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and Grirem Advanced Materials Co., Ltd.
摘 要：The novel nitride-based luminescent materials have received much attention since the end of the last century. In this paper, the commercial Eu2+-activated nitride red phosphors, Sr1.95 Si5 N8 :Eu0.05, Sr1.85 Si5 N8 :Eu0.15 and Ca0.99 AlSiN3 :Eu0.01 phosphors were annealed at different temperatures（beyond 300 oC） to investigate the dependence of their luminescence performance and structure variability on the temperature. By photoluminescence spectra, X-ray diffraction（XRD） and thermogravimetry-differential scanning calorimetry（TG-DSC） analysis, the high temperature stability of the hosts and activator of the three samples were disclosed. With the annealing temperature increasing, the activator Eu2+ions were firstly oxidized and then host in Sr1.95 Si5 N8 :Eu0.05 and Sr1.85 Si5 N8 :Eu0.15, but for Ca0.99 AlSiN3 :Eu0.01, only the oxidation of the host could be observed, which would lead to the luminescence degradation and even failure of these phosphors. The activator Eu2+ions were much more stable in CaAlSiN3 :Eu than Sr2 Si5 N8 :Eu due to their crystal surroundings, and its concentration also influenced the temperature stability of Sr2 Si5 N8 :Eu.
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