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Enhancement on afterglow properties of Eu3+ by Ti4+, Mg2+ incorporation in CaWO4 matrix

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Abstract

The long afterglow phosphor, CaWO4: Eu3+, is synthesized and the intensity and duration of its afterglow can be enhanced by the Ti4+ and Mg2+ incorporation. The x-ray diffraction patterns depict pure tetragonal CaWO4 of all samples. The emission spectra show the Eu3+ emission and the charge transfer (CT) emission of WO42−. The intensity of CT increases with the Mg2+ incorporation. The excitation spectra monitoring 616 nm exhibit the strongest CT band with Ti4+ incorporation. These results indicate that Mg2+ enhances the efficiency of CT emission of WO42− while the Ti4+ enhances the energy transfer rate from CT to Eu3+. Since the thermoluminescence (TL) curves do not imply a new trap, the enhancement of the afterglow results from the coreinforcement of CT efficiency and energy transfer rate.

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Acknowledgment

The authors acknowledge the financial support from the National Natural Science Foundation of China (Nos. 21071034 and 20871033).

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Higher Education Mega Center, Guangzhou, 510006, Guangdong Province, People’s Republic of China

    Haoyi Wu, Yihua Hu, Fengwen Kang & Nana Li

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  1. Haoyi Wu
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  2. Yihua Hu
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Correspondence to Yihua Hu.

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Wu, H., Hu, Y., Kang, F. et al. Enhancement on afterglow properties of Eu3+ by Ti4+, Mg2+ incorporation in CaWO4 matrix. Journal of Materials Research 27, 959–964 (2012). https://doi.org/10.1557/jmr.2012.16

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  • DOI: https://doi.org/10.1557/jmr.2012.16

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