Synthesis of G-La2Si2O7:Eu2+ phosphors by addition of AlF3: Experimental and theoretical analysis

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Title:	Synthesis of G-La2Si2O7:Eu2+ phosphors by addition of AlF3: Experimental and theoretical analysis
Authors:	Li, Zhan;Ji, Wei-Wei;Hao, Lu-Yuan;Yin, Liang-Jun;Xu, Xin;Agathopoulos, Simeon;Lee, Ming-Hsien
Keywords:	Phosphor;G-La2Si2O7:Eu2+;Photoluminescence;AlF3 doping
Date:	2020-12
Issue Date:	2021-05-07 12:10:34 (UTC+8)
Abstract:	The Eu2+-doped G-La2Si2O7 phosphor was successfully prepared through the high-temperature solid-state reaction method with the aid of AlF3 flux. The results of Eu L3-edge XANES characterization showed that only Eu3+ can be detected in as-received G-La2Si2O7 phosphor and that Al2O3 addition leads to a partial reduction of Eu3+ to Eu2+, while complete reduction occurs with AlF3 addition. The obtained Eu2+-doped G-La2Si2O7 phosphor exhibited typical Eu2+ blue-green emission under the near-UV light excitation. The analysis of Fourier transform infrared spectroscopy (FT-IR) and 27Al nuclear magnetic resonance (NMR) results suggests that Al occupies the Si sites and F occupies the O sites. The positive influence of Al–F doping is related to the structure of the produced phosphors, which was analyzed with the aid of first-principles density functional calculations. The results of the theoretical calculations are a good match to the experimental findings.
Relation:	Journal of Alloys and Compounds 844(5), 156127
DOI:	10.1016/j.jallcom.2020.156127
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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