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Synthesis, structure, and photoluminescence properties of Ce3+ and Tb3+ doped alkaline-earth silicate Sr2MgSi2O7 phosphors for WLEDs

Published online by Cambridge University Press:  12 January 2017

Yongqian Wang ,
Yan Chen ,
Qimeng Sun  and
Bing Yan
Yongqian Wang*
Affiliation:
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
Yan Chen
Affiliation:
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
Qimeng Sun
Affiliation:
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
Bing Yan*
Affiliation:
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
*
a) Address all correspondence to these authors. e-mail: cugwyq@126.com
b) e-mail: 554655019@qq.com
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Abstract

In this research, Ce3+ and Tb3+ doped alkaline-earth silicate Sr2MgSi2O7 phosphors have been synthesized by solid-state reaction. The results show that the Sr2−x MgSi2O7:xCe3+ phosphors exhibit a violet–blue emission with excitation at 348 nm, whereas the Sr2−y MgSi2O7:yTb3+ phosphor show a green emission with excitation at 243 nm. In addition, the structure of Sr2MgSi2O7 host has been analyzed by Crystalmaker program. Staggered arrangements of [SiO4] and [MgO4] units in the Sr2MgSi2O7 system underlie possible chemical tuning and phase segregation, providing a potential candidate of tunable luminescence. A red shift of wave length is clarified by crystal field theory and Van Uitert expression. The FESEM image of Sr1.99MgSi2O7:0.01Ce3+ phosphors reveal that it has a proper particle size for application in WLEDs. With different Tb3+ doping concentration, the CIE chromaticity coordinates Sr2MgSi2O7:Tb3+ phosphors still remain a steady position. These results indicate that Sr2−x MgSi2O7:xCe3+, Sr2−y MgSi2O7:yTb3+ phosphors are promising phosphors for WLEDs.

Keywords

Sr2MgSi2O7rare earth ions dopedcrystal field theoryluminescence
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 3 , 14 February 2017 , pp. 547 - 556
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Winston V. Schoenfeld

References

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