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Upconversion luminescence properties of Li+-doped ZnWO4:Yb,Er

Published online by Cambridge University Press:  31 January 2011

Xi-xian Luo  and
Wang-he Cao
Xi-xian Luo*
Affiliation:
Optoelectronic Technology Institute, Physics Department, Dalian Maritime University, Dalian, Liaoning 116026, People’s Republic of China
Wang-he Cao
Affiliation:
Optoelectronic Technology Institute, Physics Department, Dalian Maritime University, Dalian, Liaoning 116026, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Upconversion luminescence (UPL) characteristics and effects of Li+ ion on the UPL of ZnWO4:Yb,Er polycrystalline phosphors were investigated. It was shown that introduction of Li+ ions could reduce the calcination temperature by about 200 °C and increase the crystallinity of ZnWO4:Yb,Er by a liquid-phase sintering process via formation of Li2WO4 and other intermediates. UPL efficiency is remarkably promoted by Li+ ions. Moreover, the UPL spectrum of Li+-doped ZnWO4:Yb,Er presents a red shift, and the strongest peak position shifts from 553 to 559 nm. These can be attributed to a shift in the 4f level barycenter to lower energy, which results from lowering of the symmetry of the crystal field around Er3+.

Keywords

ErLuminescenceOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2078 - 2083
Copyright
Copyright © Materials Research Society 2008

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References

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