MCaHxF3−x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu2+ Luminescence
MCaHxF3−x (M = Rb, Cs): Synthesis, Structure, and Bright, Site‐Sensitive Tunable Eu2+ Luminescence
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DOI：
10.1002/adom.202002052
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发表时间：
2021-02
影响因子：
9
通讯作者：
Alexander Mutschke;Thomas Wylezich;A. Sontakke;A. Meijerink;M. Hoelzel;N. Kunkel
中科院分区：
文献类型：
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作者：
Alexander Mutschke;Thomas Wylezich;A. Sontakke;A. Meijerink;M. Hoelzel;N. Kunkel
随着人们对混合阴离子氢化物的兴趣日益浓厚，人们报道了许多有趣的特性。在这里，研究了（Eu2+掺杂）MCaH3-MCaF3（M = Rb，Cs）的结构和光学性质。对于M = Rb，找到完整的氢化物-氟化物固溶体系列；对于M = Cs，已知的固溶体系列（0 ≤ x ≤ 1.70）可以扩展到x = 3。对于Cs，在Eu2+掺杂样品中观察到非常明亮的发光发射，而在Rb基化合物中发光相当弱。随着氢化物含量的增加，可以观察到发射颜色从青绿色转变为红色。与早期关于混合氟化物-氢化物主体的报道相反，红移不是单个宽发射带的逐渐移动，而是在低能量侧出现新的窄发射带，这些发射带被分配给具有较高氢化物含量的位点的占据。因此，这一发现代表了混合阴离子氢化物的第一个例子，该混合阴离子氢化物对第一配位层中氢化物含量局部变化的位点具有位点敏感发射，并且可以作为利用混合阴离子化合物调整发射颜色的一般例子。
With increasing interest in mixed‐anionic hydrides, a number of interesting properties have been reported. Here, the structural and optical properties of (Eu2+‐doped) MCaH3–MCaF3 (M = Rb, Cs) are investigated. For M = Rb, a complete hydride–fluoride solid solution series is found and for M = Cs, the known solid solution series (0 ≤ x ≤ 1.70) can be extended to x = 3. In case of Cs, a very bright luminescence emission is observed in Eu2+‐doped samples, whereas the luminescence is fairly weak in Rb based compounds. With increasing hydride content, a shift of the emission color from cyan‐green to red can be observed. In contrast to earlier reports for mixed fluoride–hydride host, the redshift is not a gradual shift of a single broad emission band, but the appearance of new narrow emission bands on the low energy side, which are assigned to the occupation of sites with higher hydride content. Consequently, this finding represents the first example in a mixed anionic hydride with a site‐sensitive emission for sites with locally varying hydride content in the first coordination sphere and may serve as a general example for emission color tuning taking advantage of mixed‐anionic compounds.