Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 134, Issue 2-3, Pages 695-699Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.03.052
Keywords
Upconversion luminescence; Tr-doped Li+ ion; UC enhancement; Crystal field distortion
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Funding
- Academic Research Program of Korea National University of Transportation
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The polycrystalline Li+/Er3+/Yb3+ tri-doped CaMoO4 were prepared by complex citrate-gel method. Under excitation of 980 nm, Li+/Er3+/Yb3+ tri-doped CaMoO4 upconversion (UC) phosphors exhibited weak red (656 and 670 nm), blue (410 nm) and strong green UC emission peaks (530 and 550 nm), respectively. The measured green emission intensity of Li+ doped CaMoO4 was 83 times higher than that of Li+ non-doped CaMoO4 due to local crystal field distortion or break around Er3+ ions. The optimum doping concentration of Li+ ions was investigated. Moreover, the effects of Li+ concentration for UC emission intensity were studied in detail. (C) 2012 Elsevier B.V. All rights reserved.
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