文章基本信息

标题：New Insight into Phase Formation of M_xMg₂Al_4+xSi_5−xO₁₈:Eu²⁺ Solid Solution Phosphors and Its Luminescence Properties
本地全文：下载
作者：Jun Zhou ; Zhiguo Xia ; Mingyue Chen 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep12149
出版社：Springer Nature
摘要：Here we reported the phase formation of M_xMg₂Al_{4+ x}Si_{5− x}O₁₈:Eu²⁺ (M = K, Rb) solid solution phosphors, where M⁺ ions were introduced into the void channels of Mg₂Al₄Si₅O₁₈ via Al³⁺/Si⁴⁺ substitution to keep the charge balance. XRD results revealed that the as-prepared phosphors with different M⁺ contents were iso-structural with Mg₂Al₄Si₅O₁₈ phase. The combined analysis of the Rietveld refinement and high resolution transmission electron microscopy (HRTEM) results proved that M⁺ ions were surely introduced into the intrinsic channels in Mg₂Al₄Si₅O₁₈. The emission peaks of M_xMg₂Al_{4+ x}Si_{5− x}O₁₈:Eu²⁺ (M = K, Rb) phosphors with various x values performed a systematic red-shift tendency, which was ascribed to the elongation of [MgO₆] octahedra. The temperature stable photoluminescence and internal quantum efficiency (QE) of M_xMg₂Al_{4+ x}Si_{5− x}O₁₈:Eu²⁺ (M = K, Rb) phosphors were enhanced owing to the filling of M⁺ in the void channels suggesting a new insight to design the solid solution phosphors with improved photoluminescence properties.