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  • Enhanced red emission of Yb...
    Zhang, Tianqing; Yang, Wenjing; Li, Hongbin; Wang, Xinyu; Jiang, Xiliang; Leng, Zhuang; Yang, Weiling; Li, Ce; Lin, Hai; Liu, Huisheng; Huang, Keke; Li, Chun; Zeng, Fanming; Su, Zhongmin

    Journal of luminescence, December 2021, 2021-12-00, Letnik: 240
    Journal Article

    In this work, Yb, Ho, Gd3+/Gd3+, Ce3+: NaY(WO4)2 phosphors doped with various concentrations of Gd3+ and Ce3+ ions were prepared via high-temperature solid-state method. Under the excitation of 980 nm near-infrared light, the doping of Gd3+ ions enhances the red and green emission of Yb, Ho: NaY(WO4)2, and on this basis, the Y3+ ion is replaced by Ce3+ ion doping, the red upconversion emission intensity was enhanced with Ce3+ concentration increasing. It was found that two efficient cross-relaxation processes between Ho3+ and Ce3+ ions had been employed to enhance red emission and suppress green emission. The possible upconversion mechanisms between Ho3+ and Ce3+ ions were investigated in detail. Yb3+, Ho3+, Gd3+, Ce3+ co-doped NaY(WO4)2 phosphors have broad application prospects in the fields of anti-counterfeiting and display, magnetic resonance imaging and optical temperature sensors. •The Yb, Ho: NaYGd(WO4)2 phosphors shows intense green UC emission on excitation with 980 nm.•The luminous color is tuned from green to red by introducing Ce3+ ions.•The two CR processes of Ce3+ ions enhance the red emission of the sample.•This sample is suitable for anti-counterfeiting applications.