Color-tunable visible photoluminescence of Eu:CaF2 single crystals: variations of valence state and local lattice environment of Eu ions

doi:10.1364/OE.27.000523

	Color-tunable visible photoluminescence of Eu:CaF2 single crystals: variations of valence state and local lattice environment of Eu ions
	Yu, Hao; Zhang, Bo; Chen, Xueyuan; Qian, Xiaobo; Jiang, Dapeng; Wu, Qinghui; Wang, Jingya; Xu, Jun; Su, Liangbi
刊名	OPTICS EXPRESS
	2019-01-21
卷号	27 期号:2 页码:523
ISSN号	1094-4087
DOI	10.1364/OE.27.000523
文献子类	Article
英文摘要	In this article, Eu-activated CaF2 single crystals were synthesized by Bridgman-Stockbarge method. The dependence of photoluminescence properties of Eu: CaF2 crystals in UV-Vis regions on EuF3 doping concentrations were investigated. While the EuF3 doping concentration is increased from 0.6% to 6.0%, the CIE (Commission Internationale de L'Eclairage) color coordinates of Eu: CaF2 crystals can be tuned from (0.28, 0.12) to (0.60, 0.38), corresponding to the luminescence color from blue to orange. XPS (X-ray Photoelectron Spectroscopy) measurements indicated that Eu2+ and Eu3+ ions both existed in the crystals. With EuF3 doping concentration increasing, the proportion of Eu3+ ions increase from 16.73% to 39.00%, while that of Eu2+ ions decrease from 83.27% to 61.00%. Moreover, the integrated intensity ratio (R) of the 614 mn to 593 mn of Eu3+ ions increase from 0.38 to 0.44, indicating the local lattice environment symmetry of Eu3+ ions become lower with higher EuF3 doping concentrations. Furthermore, the CIE chromaticity coordinates of Eu: CaF2 crystals greatly depend on the excitation wavelength. The warm white-light emission has been realized in 0.6%Eu: CaF2 crystal when the excitation wavelength is around 322 mu. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
WOS研究方向	Optics
语种	英语
出版者	OPTICAL SOC AMER
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/27389]
专题	中国科学院上海硅酸盐研究所
推荐引用方式 GB/T 7714	Yu, Hao,Zhang, Bo,Chen, Xueyuan,et al. Color-tunable visible photoluminescence of Eu:CaF2 single crystals: variations of valence state and local lattice environment of Eu ions[J]. OPTICS EXPRESS,2019,27(2):523.
APA	Yu, Hao.,Zhang, Bo.,Chen, Xueyuan.,Qian, Xiaobo.,Jiang, Dapeng.,...&Su, Liangbi.(2019).Color-tunable visible photoluminescence of Eu:CaF2 single crystals: variations of valence state and local lattice environment of Eu ions.OPTICS EXPRESS,27(2),523.
MLA	Yu, Hao,et al."Color-tunable visible photoluminescence of Eu:CaF2 single crystals: variations of valence state and local lattice environment of Eu ions".OPTICS EXPRESS 27.2(2019):523.