To tune europium valence by controlling the composition in diphase silicate phosphors
来源期刊：JOURNAL OF RARE EARTHS2018年第10期
论文作者：Yiting Lin Jukui Zhou Zhongxian Qiu Wenli Zhou Jilin Zhang Chengzhi Li Liping Yu Shixun Lian
文章页码：1015 - 1023
摘 要：Commercial phosphors always require fewer impurities and higher crystallinity, but sometimes it is difficult or strict to synthesize a pure phase compound. Indeed, if the practical application is not influenced, it is acceptable to synthesize a kind of phosphors with diphase matrix that have similar structure and photoluminescence properties. In present work, we designed and synthesized a series of（1-x）BaMSiO4·xBa2 MSi2 O7:Eu(M = Zn2+, Mg2+) diphase phosphors which contained two phases BaMSiO4（hexagonal, P63） and Ba2 MSi2 O7（monoclinic, C2/c） by a high temperature solid-state reaction in air condition. The structures and luminescence properties related to the phase transform from BaMSiO4 to Ba2 MSi2 O7 were analyzed carefully. The results show that the self-reduction ability of Eu3+ is not the best in above four compounds, respectively. But it reaches the maximum and gets the green emission under the UV lamp when the matrix is in a proper ratio of two phases, which suggests that the heterostructure between the two crystals（BaMSiO4 and Ba2 MSi2 O7） improves the self-reduction process of the diphase.The possible mechanism of the tunable europium valence and the luminescent properties in（1-x）BaMSiO4·xBa2 MSi2 O7:Eu phosphors were discussed in detail.
Yiting Lin，Jukui Zhou，Zhongxian Qiu，Wenli Zhou，Jilin Zhang，Chengzhi Li，Liping Yu，Shixun Lian
Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education),Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province,College of Chemistry and Chemical Engineering,Hunan Normal University
摘 要：Commercial phosphors always require fewer impurities and higher crystallinity, but sometimes it is difficult or strict to synthesize a pure phase compound. Indeed, if the practical application is not influenced, it is acceptable to synthesize a kind of phosphors with diphase matrix that have similar structure and photoluminescence properties. In present work, we designed and synthesized a series of（1-x）BaMSiO4·xBa2 MSi2 O7:Eu(M = Zn2+, Mg2+) diphase phosphors which contained two phases BaMSiO4（hexagonal, P63） and Ba2 MSi2 O7（monoclinic, C2/c） by a high temperature solid-state reaction in air condition. The structures and luminescence properties related to the phase transform from BaMSiO4 to Ba2 MSi2 O7 were analyzed carefully. The results show that the self-reduction ability of Eu3+ is not the best in above four compounds, respectively. But it reaches the maximum and gets the green emission under the UV lamp when the matrix is in a proper ratio of two phases, which suggests that the heterostructure between the two crystals（BaMSiO4 and Ba2 MSi2 O7） improves the self-reduction process of the diphase.The possible mechanism of the tunable europium valence and the luminescent properties in（1-x）BaMSiO4·xBa2 MSi2 O7:Eu phosphors were discussed in detail.
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