Abstract Deep-red-emitting Mn4+ activated oxide phosphors are the hot research topic due to their potential applications in indoor plant cultivation LEDs. In this paper, a novel double-perovskite LiLaMgTeO6:Mn4+ phosphor was firstly prepared by high-temperature solid-state reaction method and its structure of the phosphor was determined by X-ray diffraction (XRD) and Rietveld refinement. Density functional theory (DFT) calculations using VASP provide an insight into the bandgap and electronic structures of the LiLaMgTeO6 host. Under UV or blue excitation, LiLaMgTeO6:Mn4+ shows a good stability and bright far-red light in the 540–800 nm range with the maximum at 708 nm, which matches well with the absorption band of phytochrome PFR, indicating its potential application in improving plant growth. The optimal Mn4+ doping concentration was approximately 0.6 mol%. Furthermore, a white-LEDs device made of a 365 nm chip coated with present phosphor and commercial green, blue phosphors was designed for indoor plant cultivation. The results indicate that the LiLaMgTeO6: Mn4+ phosphor possesses great application prospect in white-LEDs for plant cultivation.

中文翻译：

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用于室内植物栽培白光 LED 的新型双钙钛矿 LiLaMgTeO6：Mn4+ 远红荧光粉：晶体和电子结构以及光致发光特性

摘要 深红色Mn4+活化氧化物荧光粉因其在室内植物栽培LEDs中的潜在应用而成为研究热点。本文首先采用高温固相反应法制备了新型双钙钛矿LiLaMgTeO6:Mn4+荧光粉，并通过X射线衍射（XRD）和Rietveld精修确定了其结构。使用 VASP 的密度泛函理论 (DFT) 计算可以深入了解 LiLaMgTeO6 主体的带隙和电子结构。在紫外或蓝光激发下，LiLaMgTeO6:Mn4+ 在 540-800 nm 范围内表现出良好的稳定性和明亮的远红光，最大值为 708 nm，与光敏色素 PFR 的吸收带很好地匹配，表明其在改善植物生长。最佳 Mn4+ 掺杂浓度约为 0.6 mol%。此外，由涂有现有荧光粉和商用​​绿色、蓝色荧光粉的 365 nm 芯片制成的白光 LED 设备设计用于室内植物栽培。结果表明，LiLaMgTeO6:Mn4+荧光粉在用于植物栽培的白光LED中具有很大的应用前景。