Abstract Mn4+ doped Ba6Y2W3O18 and Ba6Gd2W3O18 phosphors of double perovskite structure have been synthesized via solid-state reaction method at high-temperature. Excitation spectra show the phosphors have broad excitation band in region of 300−600 nm with four Gaussian fitting bands peaking at around 331 nm, 366 nm, 440 nm and 518 nm for Ba6Y2W3O18:Mn4+ and peaking at around 347 nm, 374 nm, 436 nm and 511 nm for Ba6Gd2W3O18:Mn4+. Far-red emission band locates at 693 nm for Ba6Y2W3O18:Mn4+ and at 676 nm for Ba6Gd2W3O18:Mn4+, respectively. The Maximum IQC is as high as 59.82 % for Ba6Y2W3O18:Mn4+ and 58.68 % for Ba6Gd2W3O18:Mn4+. The difference of the crystal field strength and nephelauxetic effect of Mn4+ ion in Ba6Y2W3O18 and Ba6Gd2W3O18 matrix are also discussed. The substitution between Y3+ and Gd3+ induced variation of luminescence properties might give meaningful reference for designing new Mn4+-doped phosphor or regulating its luminescence performance.

中文翻译：

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Mn4+掺杂Ba6Y2W3O18和Ba6Gd2W3O18荧光粉发光性能对比研究

摘要 采用高温固相反应法合成了双钙钛矿结构的Mn4+掺杂Ba6Y2W3O18和Ba6Gd2W3O18荧光粉。激发光谱显示磷光体在 300-600 nm 区域具有宽激发带，其中四个高斯拟合带在 Ba6Y2W3O18:Mn4+ 的 331 nm、366 nm、440 nm 和 518 nm 附近达到峰值，并在 347 nm、374 nm、436 附近达到峰值Ba6Gd2W3O18:Mn4+ 为 nm 和 511 nm。Ba6Y2W3O18:Mn4+ 的远红光发射带分别位于 693 nm 和 Ba6Gd2W3O18:Mn4+ 的 676 nm。Ba6Y2W3O18:Mn4+ 的最大 IQC 高达 59.82%，Ba6Gd2W3O18:Mn4+ 的最大 IQC 高达 58.68%。还讨论了 Mn4+ 离子在 Ba6Y2W3O18 和 Ba6Gd2W3O18 基体中的晶体场强和浊化效应的差异。