A new host compound of an aluminum lithium fluoride oxide (ALFO) was proposed for deep red phosphors based on the luminescent centers of Mn4+, Fe3+, and Cr3+. The characterization brought an estimated composition of Al4LiF0.1O6.45, indicating that fluorine was largely lost during the heat-treatment in spite of the expected composition of Al4LiFO6 from the starting mixture. ALFO was a disordered spinel compound whose structure was different from ordered inverse-spinel LiAl5O8 with respect to the cation arrangement. In ALFO, Li+ and Al3+ were statistically distributed over the tetrahedral and octahedral sites in the spinel-type lattice. Each luminescent center of Mn4+, Fe3+, and Cr3+ led to deep red emission in ALFO and the disordered nature of the crystal structure remarkably enhanced the luminescence of Mn4+ compared to Mn4+ in LiAl5O8. Among these luminescent centers, the emission peak of Mn4+ arose on the shortest wavelength side with the peak top at 661 nm. Fe3+ and Cr3+ showed, respectively, the rather broad peak centering around 690 nm and the characteristic twin peak with the tops at 705 and 715 nm.

中文翻译：

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一种基于 Mn4+、Fe3+ 和 Cr3+ 的深红色荧光粉新型氟化铝锂主体化合物

基于 Mn4+、Fe3+ 和 Cr3+ 的发光中心，提出了一种用于深红色荧光粉的新型氟化铝锂 (ALFO) 主体化合物。表征带来了 Al4LiF0.1O6.45 的估计组成，表明尽管起始混合物中的 Al4LiFO6 的预期组成在热处理过程中氟大部分损失。ALFO是一种无序尖晶石化合物，其结构与有序反尖晶石LiAl5O8的阳离子排列不同。在ALFO中，Li+和Al3+在尖晶石型晶格的四面体和八面体位点上统计分布。与 LiAl5O8 中的 Mn4+ 相比，Mn4+、Fe3+ 和 Cr3+ 的每个发光中心导致 ALFO 中的深红色发射和晶体结构的无序性质显着增强了 Mn4+ 的发光。在这些发光中心中，Mn4+的发射峰出现在波长最短的一侧，峰顶在661 nm。Fe3+ 和Cr3+ 分别在690 nm 附近显示出相当宽的峰和在705 和715 nm 处具有峰顶的特征双峰。