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Phytochemical mediated synthesis of ZnO:Dy3+ nanophosphors: Judd–Ofelt analysis, structural and spectroscopic properties
Journal of Science: Advanced Materials and Devices ( IF 7.382 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jsamd.2020.05.001
Prathibha Vasudevan , Viji Vidyadharan , Sanu Mathew Simon , Unnikrishnan N. V

Abstract In the present work, ZnO:Dy3+ nanophosphors were synthesized by a simple, cost effective and eco-friendly route using the aqueous extract of Azadirachta Indica leaves. The prepared ZnO:Dy3+ nanophosphors were characterized using X-ray diffraction (XRD), Fourier Transformed Infra-Red (FTIR), Raman, UV-VIS diffuse reflectance (UVDR) spectroscopy and Photoluminescence (PL), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectroscopy (EDX). TEM and X-ray diffraction analyses reveal the hexagonal wurtzite structure of the ZnO nanoparticles in the prepared samples. UV-VIS-NIR spectrum of the ZnO:Dy3+ nanophosphor was analysed on the basis of Judd–Ofelt (J-O) theory and the J–O intensity parameters (Ωλ) were calculated. The radiative properties, such as radiative transition probability, branching ratio, stimulated emission cross-section and optical gain were investigated using the J–O intensity parameters. The photo luminescence emission spectra (PLE) of the Dy3+ doped samples exhibits three emission bands relative to 4F9/2→ 6H15/2 (478 nm), 4F9/2→ 6H13/2 (572 nm) and 4F9/2→ 6H11/2 (663 nm) transitions of Dy3+ ions respectively. The CIE chromaticity color coordinate shows that the ZnO:Dy3+ nanophosphors can be useful for white luminescence applications. The result indicates that the prepared phosphors produce white light emission and can be used for near ultraviolet excited white light emitting diode (NUV WLED) applications.

中文翻译:

ZnO:Dy3+ 纳米磷光体的植物化学介导合成:Judd-Ofelt 分析、结构和光谱特性

摘要 在目前的工作中,ZnO:Dy3+ 纳米磷光体使用印楝叶的水提取物通过简单、经济且环保的途径合成。使用 X 射线衍射 (XRD)、傅里叶变换红外 (FTIR)、拉曼、紫外-可见漫反射 (UVDR) 光谱和光致发光 (PL)、透射电子显微镜 (TEM)、扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDX)。TEM 和 X 射线衍射分析揭示了制备的样品中 ZnO 纳米颗粒的六方纤锌矿结构。基于 Judd-Ofelt (JO) 理论分析了 ZnO:Dy3+ 纳米磷光体的 UV-VIS-NIR 光谱并计算了 J-O 强度参数 (Ωλ)。辐射特性,例如辐射跃迁概率,使用 J-O 强度参数研究了分支比、受激发射截面和光学增益。Dy3+ 掺杂样品的光致发光发射光谱 (PLE) 表现出相对于 4F9/2→ 6H15/2 (478 nm)、4F9/2→ 6H13/2 (572 nm) 和 4F9/2→ 6H11/2 的三个发射带Dy3+ 离子的 (663 nm) 跃迁分别。CIE 色度色坐标表明 ZnO:Dy3+ 纳米磷光体可用于白光发光应用。结果表明制备的荧光粉产生白光发射,可用于近紫外激发白光发光二极管(NUV WLED)应用。Dy3+ 掺杂样品的光致发光发射光谱 (PLE) 表现出相对于 4F9/2→ 6H15/2 (478 nm)、4F9/2→ 6H13/2 (572 nm) 和 4F9/2→ 6H11/2 的三个发射带Dy3+ 离子的 (663 nm) 跃迁分别。CIE 色度色坐标表明 ZnO:Dy3+ 纳米磷光体可用于白光发光应用。结果表明制备的荧光粉产生白光发射,可用于近紫外激发白光发光二极管(NUV WLED)应用。Dy3+ 掺杂样品的光致发光发射光谱 (PLE) 表现出相对于 4F9/2→ 6H15/2 (478 nm)、4F9/2→ 6H13/2 (572 nm) 和 4F9/2→ 6H11/2 的三个发射带Dy3+ 离子的 (663 nm) 跃迁分别。CIE 色度色坐标表明 ZnO:Dy3+ 纳米磷光体可用于白光发光应用。结果表明制备的荧光粉产生白光发射,可用于近紫外激发白光发光二极管(NUV WLED)应用。
更新日期:2020-06-01
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