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Elucidating the electronic structures and photoluminescence properties of single-phase ScF 3 :Dy 3+ , Eu 3+ , Ce 3+ phosphors for LEDs
Journal of Sol-Gel Science and Technology ( IF 2.3 ) Pub Date : 2020-09-10 , DOI: 10.1007/s10971-020-05411-y
Rui Zhu , Zun Bi , Ke Jia , Yunfei Liu , Yinong Lyu

A series of single-component ScF3:Dy3+, Eu3+, Ce3+ phosphors prepared by means of microwave hydrothermal method were explored for light-emitting diodes. The as-prepared samples were characterized via X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL) spectroscopy. In order to rationalize the experimental results, first-principle calculations based on density functional theory had been carried out to discover electronic structures. PL performance of the RE3+-doped phosphors exhibited well-defined bands in the visible region. By adjusting the ratios of Ce/Dy/Eu, the color of the as-prepared phosphors can vary from blue (0.24, 0.23) to red (0.51, 0.30) across the white (0.34, 0.26) region according to the chromaticity coordinates. The results suggested that the Dy/Eu/Ce-doped ScF3 might act as down-convert phosphors for near ultraviolet light-emitting diodes, especially for white LEDs. What is more, it can also promote a deep comperhension of the relationship between structure and properties in ScF3-based phosphors.



中文翻译:

阐明用于LED的单相ScF 3:Dy 3+,Eu 3+,Ce 3+荧光粉的电子结构和光致发光特性

探索了通过微波水热法制备的一系列单组分ScF 3:Dy 3+,Eu 3+,Ce 3+荧光粉用于发光二极管。通过X射线衍射(XRD),扫描电子显微镜(SEM)和光致发光(PL)光谱对制备的样品进行表征。为了使实验结果合理化,已经进行了基于密度泛函理论的第一性原理计算,以发现电子结构。RE 3+的PL性能掺杂的磷光体在可见光区域显示出清晰的谱带。通过调整Ce / Dy / Eu的比例,根据色度坐标,可以在白色(0.34,0.26)区域从蓝色(0.24,0.23)到红色(0.51,0.30)改变制备的磷光体的颜色。结果表明,Dy / Eu / Ce掺杂的ScF 3可能充当下转换磷光体,用于近紫外发光二极管,尤其是白光LED。而且,它还可以促进对基于ScF 3的磷光体的结构与性能之间的关系的深刻理解。

更新日期:2020-10-30
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