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HomeKey Engineering MaterialsKey Engineering Materials Vol. 727Simplified Synthesis and Luminous Mechanism of...

Simplified Synthesis and Luminous Mechanism of Eu²⁺-Doped α-Si₃N₄ Nanowires with Strong Green Luminescent Properties

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Abstract:

Ultra-long, single crystal, Eu-doped α-Si₃N₄ nanowires were prepared by a simple approach involving nitriding Eu-doped cryomilled nanocrystalline Si powder in NH₃ flow at 1350 °C for 4 h. Phases, chemical composition and microcosmic feature of cryomilled powders and as-prepared nanowires were tested by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), respectively. The results suggested that Eu was successfully introduced into Si lattice after the cryomilling process and then entered into the lattice of α-Si₃N₄ during the nitridation process. The as-synthesized Eu-doped α-Si₃N₄ nanowires had highly uniform dimension with 20~30 nm in diameter and ~100 μm in length. The room temperature photoluminescence (PL) spectrum of as-synthesized nanowires showed a broad band emission center at 570 nm which was attributed to the transition from 4f⁶5d to 4f⁷ in Eu²⁺. The transition from Eu³⁺ to Eu²⁺ during nitridation process was tested by X-ray photoelectron spectroscopy (XPS).

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Functional Materials Research II

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

635-641

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.635

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Online since:

January 2017

Authors:

Rui Su, Zhi Feng Huang, Fei Chen, Qiang Shen, Lian Meng Zhang

Keywords:

Europium, Photoluminescence, Silicon Nitride Nanowires

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