Effect of Yb3+ and Tm3+ concentrations on blue and NIR upconversion luminescence in Yb3+, Tm3+ co-doped CaMoO4

Polycrystalline Tm3+/Yb3+ co-doped CaMoO4 UC phosphors were successfully synthesized by a complex citrate-gel method and their upconversion (UC) luminescence was investigated. Under excitation at 980nm, Tm3+/Yb3+ co-doped CaMoO4 showed bright blue emission near 475nm generated by the 1G4→3H6 transit...

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Bibliographic Details
Published in:	Ceramics international Vol. 39; no. 2; pp. 1951 - 1956
Main Authors:	Chung, Jun Ho, Ryu, Jeong Ho, Lee, Sang Yeop, Kang, Suk Hyun, Shim, Kwang Bo
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-03-2013
Subjects:	Ceramics Cobalt Emission Luminescence Optimization Phosphors Pumps Tm3+/Yb3+ co-doped CaMoO4 Upconversion Upconversion (UC) luminescence Upconversion mechanism Upconversion (UC) luminescence Upconversion mechanism Tm3+/Yb3+ co-doped CaMoO4
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Summary:	Polycrystalline Tm3+/Yb3+ co-doped CaMoO4 UC phosphors were successfully synthesized by a complex citrate-gel method and their upconversion (UC) luminescence was investigated. Under excitation at 980nm, Tm3+/Yb3+ co-doped CaMoO4 showed bright blue emission near 475nm generated by the 1G4→3H6 transition and strong NIR UC emission around 796nm generated by the 3H4→3H6 transition, with weak red emission near 650nm due to the 3F2→3H6 transition. The optimum doping concentrations of Tm3+ and Yb3+ for the highest UC luminescence were investigated, and the related UC mechanism of Tm3+/Yb3+ co-doped CaMoO4 depending on pump power was studied in detail.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0272-8842 1873-3956
DOI:	10.1016/j.ceramint.2012.08.045