Abstract Among various red phosphors, Mn4+ activated fluoride hosts have received much attention due to their blue excitability and intense red emission. In this study we report a novel (NH4)3AlF6:Mn4+ phosphor, synthesized through a facile synthesis process avoiding high quantities of highly toxic HF acid. The synthesized host exhibit cubic structure in F-4 3m space group, with plenty of [AlF6]3+ octahedral sites. When activated with Mn4+ the crystal structure is retained and the material exhibits characteristic excitation bands with maximum around 469 nm and intense red emission around 631 nm. Furthermore, the thermal gravimetric analysis revealed the stability of composition up to 250 °C. The phosphor however exhibits high sensitivity to increased temperature and showed sharp quenching of luminescence at elevated temperatures.

中文翻译：

---

(NH4)3AlF6:Mn4+ 一种新型红色磷光体——简便的合成、结构和发光特性

摘要 在各种红色荧光粉中，Mn4+ 活化的氟化物主体因其蓝色可激发性和强烈的红色发射而备受关注。在这项研究中，我们报告了一种新型 (NH4)3AlF6:Mn4+ 磷光体，它是通过简便的合成过程合成的，避免了大量剧毒的 HF 酸。合成的主体在 F-4 3m 空间群中表现出立方结构，具有大量的 [AlF6]3+ 八面体位点。当用 Mn4+ 激活时，晶体结构得以保留，材料表现出特征激发带，最大波长约为 469 nm，红色发射强度约为 631 nm。此外，热重分析揭示了高达 250 °C 的组合物稳定性。然而，磷光体对升高的温度表现出高敏感性并且在升高的温度下显示出发光的急剧淬灭。