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Mn2+ doped CdAl2O4 phosphors with new structure and special fluorescence properties: experimental and theoretical analysis

机译：Mn 2 + 掺杂的CdAl 2 O 4 新型结构和特殊荧光性质的荧光粉：实验和理论分析

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摘要

Mn2+-activated CdAl2O4 phosphors with the new structure of space group R (no. 148) have been prepared by a high-temperature solid-state reaction and their luminescence properties have been investigated in detail. The reduction of Mn4+ to Mn2+ in air atmosphere has been observed in CdAl2O4 powders for the first time. The structural properties including the phase purity and structural parameters were analyzed through Rietveld analysis. The typical transitions of Mn2+ ions in emission and excitation spectra were observed both in MnCO3 and MnO2 prepared CdAl2O4:0.01Mn2+ phosphors, which means that the luminescent centers of Mn2+ ions were from the Mn4+ ions which were reduced. Meanwhile, the energy band structures of CdAl2O4 and CdAl2O4:Mn2+ were measured with an ultraviolet-visible diffuse reflection spectroscopy (UV-vis DRS), the electronic structures were calculated using the plane-wave density functional theory (DFT). The Mn2+ activated CdAl2O4:Mn2+ phosphor prepared in air atmosphere is a potential blue-green emitting phosphor.
机译：Mn 2 + 活化的CdAl 2 O 4 R （148）结构的荧光粉，并对其发光性能进行了详细研究。在CdAl <中观察到空气中Mn 4 + 还原为Mn 2 + sub> 2 O 4 粉末。通过Rietveld分析法分析了包括相纯度和结构参数在内的结构性质。在MnCO 3 和MnO <均观察到发射和激发光谱中Mn 2 + 离子的典型跃迁small> 2 制备的CdAl 2 O 4 ：0.01Mn 2 + 荧光粉，这意味着Mn 2 + 离子的发光中心来自Mn 被还原的 4 + 离子。同时，CdAl 2 O 4 和CdAl 2 的能带结构用紫外可见漫反射光谱法测量sub> O 4 ：Mn 2 + （UV-vis DRS），使用平面波密度泛函理论（DFT）计算电子结构。 Mn 2 + 活化的CdAl 2 O 4 ：Mn 2 + 荧光粉是潜在的发蓝绿色荧光粉。

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