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

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-...

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Bibliographic Details
Published in:Journal of materials research 2008-08, Vol.23 (8), p.2078-2083
Main Authors: Luo, Xi-xian, Cao, Wang-he
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Inorganic Chemistry
Luminescence
Materials Engineering
Materials Science
Nanotechnology
Optical properties
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Summary: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+.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.2008.0275