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

Published online by Cambridge University Press:  07 February 2012

Haoyi Wu ,
Yihua Hu ,
Fengwen Kang  and
Nana Li
Haoyi Wu
Affiliation:
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Higher Education Mega Center, Guangzhou, 510006, Guangdong Province, People’s Republic of China
Yihua Hu*
Affiliation:
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Higher Education Mega Center, Guangzhou, 510006, Guangdong Province, People’s Republic of China
Fengwen Kang
Affiliation:
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Higher Education Mega Center, Guangzhou, 510006, Guangdong Province, People’s Republic of China
Nana Li
Affiliation:
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Higher Education Mega Center, Guangzhou, 510006, Guangdong Province, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

LuminescenceOptical propertiesLanthanide
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 6 , 28 March 2012 , pp. 959 - 964
Copyright
Copyright © Materials Research Society 2012

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