Novel Mg₂La₃NbO₉:Mn⁴⁺ powder phosphors are successfully synthesized by the high-temperature solid-state reaction method under ambient air. The crystal structure, morphology, decay lifetimes, time-resolved emission spectra, and luminescence properties are investigated. The excitation spectrum of Mg₂La₃NbO₉:Mn⁴⁺ phosphor monitored at 708 nm is observed in the region from 210 nm to 600 nm. Mg₂La₃NbO₉:Mn⁴⁺ phosphor with excitation at the ultraviolet (UV) and blue light can emit the far-red emission with the emission band peaking at ~708 nm because of the ²E → ⁴A₂ transition of Mn⁴⁺ and the corresponding chromaticity coordinates (0.7322, 0.2678). The optimal doping concentration of Mn⁴⁺ ion is ~0.6 mol%. The decay lifetime of Mg₂La₃NbO₉:xMn⁴⁺ phosphors decrease from 1.143 ms to 1.099 ms with increasing the Mn⁴⁺ ion concentration from 0.2 mol% to 1.0 mol%. The good thermal stability of Mg₂La₃NbO₉:Mn⁴⁺ phosphor is confirmed by the temperature-dependent emission spectra. The luminous mechanism of Mg₂La₃NbO₉:Mn⁴⁺ phosphor is explained by using the Tanabe Sugano energy level diagram of Mn⁴⁺ ion. All the experimental results imply that Mg₂La₃NbO₉:Mn⁴⁺ phosphor has a potential application in the white light-emitting diodes (LEDs) field.

通过高温固相反应法在环境空气中成功合成了新型Mg ₂ La ₃ NbO ₉：Mn ⁴⁺粉末荧光粉。研究了晶体结构，形态，衰减寿命，时间分辨发射光谱和发光特性。在210nm至600nm的区域中观察到在708nm处监测的Mg ₂ La ₃ NbO ₉：Mn ⁴⁺荧光粉的激发光谱。Mg ₂ La ₃ NbO ₉：Mn ⁴⁺由于Mn ⁴⁺的² E→ ⁴ A ₂跃迁和相应的色度坐标，在紫外（UV）和蓝光激发下的荧光粉可以发射远峰发射，发射带在〜708 nm处达到峰值。0.2678）。Mn ⁴⁺离子的最佳掺杂浓度为^〜0.6 mol％。Mg ₂ La ₃ NbO ₉：xMn ⁴⁺荧光粉的衰减寿命随着Mn ⁴⁺离子浓度从0.2 mol％增加到1.0 mol％而从1.143 ms减少到1.099 ms 。Mg ₂ La ₃ NbO ₉：Mn的良好热稳定性通过与温度相关的发射光谱^{可以确定4+}荧光粉。利用Tanbe Sugano的Mn ⁴⁺离子能级图解释了Mg ₂ La ₃ NbO ₉：Mn ⁴⁺荧光粉的发光机理。所有的实验结果表明，Mg ₂ La ₃ NbO ₉：Mn ⁴⁺荧光粉在白光发光二极管（LED）领域具有潜在的应用前景。