| 6 | To tune europium valence by controlling the composition in diphase silicate phosphors显示文摘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)BaMSiO_4·xBa_2 MSi_2 O_7:Eu(M = Zn^(2+), Mg^(2+)) diphase phosphors which contained two phases BaMSiO_4(hexagonal, P63) and Ba2 MSi_2 O_7(monoclinic, C2/c) by a high temperature solid-state reaction in air condition. The structures and luminescence properties related to the phase transform from BaMSiO_4 to Ba_2 MSi_2 O_7 were analyzed carefully. The results show that the self-reduction ability of Eu^(3+) 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(BaMSiO_4 and Ba_2 MSi_2 O_7) improves the self-reduction process of the diphase.The possible mechanism of the tunable europium valence and the luminescent properties in(1-x)BaMSiO_4·xBa2 MSi_2 O_7:Eu phosphors were discussed in detail. | Yiting Lin Jukui Zhou Zhongxian Qiu Wenli Zhou Jilin Zhang Chengzhi Li Liping Yu Shixun Lian | 2018 | Journal of Rare Earths2018，36，10： | 0 |
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