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Systematic investigation of photoluminescence on the mixed valence of europium in Zn2GeO4 host

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Abstract

Eu2+- and Eu3+-Zn2GeO4 were prepared by the high temperature solid-state reaction method. The phase purity and crystallinity of Zn2GeO4:Eu samples were characterized by X-ray diffraction (XRD). The excitation spectra, the emission spectra and the luminescence decay curves of the Eu2+- and Eu3+-Zn2GeO4 were investigated. Zn2GeO4:Eu2+ gives a bluish-green luminescence with one emission band located at 467 nm, and Zn2GeO4:Eu3+ presents an reddish-orange color due to the transition (5D0→7FJ, J = 1 and 2) of the Eu3+ ions. The luminescence decay curves of Eu2+ and Eu3+ provide complementary evidence to the mixed valence of europium (Eu2+, Eu3+) in Zn2GeO4 host. These indicate that the mixed valence of europium (Eu2+, Eu3+) coexists in Zn2GeO4 host prepared in an oxidizing atmosphere. The abnormal reduction phenomenon of Eu3+→Eu2+ in Zn2GeO4 host prepared in an oxidizing atmosphere was reported and discussed on the basis of the charge compensation model.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 21271049).

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou, 510006, People’s Republic of China

    Shaoan Zhang, Yihua Hu, Li Chen, Xiaojuan Wang, Guifang Ju & Zhonghua Wang

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  1. Shaoan Zhang
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  2. Yihua Hu
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  3. Li Chen
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Correspondence to Yihua Hu.

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Zhang, S., Hu, Y., Chen, L. et al. Systematic investigation of photoluminescence on the mixed valence of europium in Zn2GeO4 host. Appl. Phys. A 116, 1985–1992 (2014). https://doi.org/10.1007/s00339-014-8379-2

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  • DOI: https://doi.org/10.1007/s00339-014-8379-2

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