A double perovskite‐type substrate of La₂MgGeO₆ (LMGO) was successfully synthesized via a high‐temperature solid‐state reaction method and was codoped with Mn⁴⁺ and Dy³⁺ to form a new deep‐red phosphor (LMGO:Mn⁴⁺,Dy³⁺) for artificial plant growth light‐emitting diodes (LEDs). This extraordinary phosphor can exhibit strong far‐red emission with a maximum peak at 708 nm between 650 and 750 nm, which can be ascribed to the ²E_g → ²A_2 g spin‐forbidden transition of Mn⁴⁺. The X‐ray diffraction (XRD) patterns and high‐resolution transmission electron microscopy (HRTEM) clarified that the La³⁺ sites in the host were partly replaced by Dy³⁺ ions. Moreover, we discovered energy transfers from Dy³⁺ to Mn⁴⁺ by directly observing the significant overlap of the excitation spectrum of Mn⁴⁺ and the emission spectrum of Dy³⁺ as well as the systematic relative decline and growth of the emission bands of Dy³⁺ and Mn⁴⁺, respectively. With the increase in the activator (Mn⁴⁺) concentration, the relationship between the luminescence decay time and the energy transfer efficiency of the sensitizer (Dy³⁺) was studied in detail. Finally, an LED device was fabricated using a 460 nm blue chip, and the as‐obtained far‐red emitting LMGO:Mn⁴⁺,Dy³⁺ phosphors for Wedelia chinensis cultivation. As expected, the as‐fabricated plant growth LED‐treated Wedelia chinensis cultured in the artificial climate box with overhead LEDs demonstrated that after 28 days of irradiation, the average plant growth rate and the total chlorophyll content were better than those of specimens cultured using the commercial R‐B LED lamps, indicating that the as‐prepared phosphor could have a potential application in the agricultural industry.

中文翻译：

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通过La2MgGeO6：Dy3 +，Mn4 +荧光粉中的能量转移增强Mn4 +相关的光发射，用于植物生长发光二极管

通过高温固态反应方法成功合成了La ₂ MgGeO ₆（LMGO）的双钙钛矿型衬底，并与Mn ⁴⁺和Dy ³⁺共掺杂形成了一种新的深红色荧光粉（LMGO：Mn ⁴⁺，Dy ³⁺）用于人造植物生长发光二极管（LED）。这种非凡的磷光体可以表现出强烈的远红外发射，最大峰在650 nm至750 nm之间的708 nm处，这可归因于Mn ⁴⁺的² E _g  →  ² A _{2 g}自旋禁止跃迁。X射线衍射（XRD）模式和高分辨率透射电子显微镜（HRTEM）阐明，宿主中的La ³⁺位点被Dy ³⁺离子部分取代。此外，我们发现从镝能量转移³⁺与Mn ⁴⁺通过直接观察Mn的激发光谱的显著重叠⁴⁺和Dy的发射光谱³⁺的发射带的以及系统的相对下降和生长Dy ³⁺和Mn ⁴⁺。随着活化剂（Mn ⁴⁺浓度下，详细研究了发光衰减时间与敏化剂（Dy ³⁺）的能量转移效率之间的关系。最后，LED设备是使用460nm的蓝色芯片制造，并且所述作为获得的远红光发射LMGO：锰⁴⁺，镝³⁺磷光体为蟛蜞菊栽培。不出所料，经过LED处理的植物生长的Wedelia chinensis 在带有顶置LED的人工气候箱中培养表明，经过28天的辐照，平均植物生长速率和总叶绿素含量要优于使用商用R-B LED灯培养的标本，表明所制备的荧光粉在农业中可能有潜在的应用。