Journal
OPTICS EXPRESS
Volume 20, Issue 15, Pages 17107-17118Publisher
Optica Publishing Group
DOI: 10.1364/OE.20.017107
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Funding
- Future key technology program
- Korea Institute of Science and Technology
- industrial strategic technology development program [10035274]
- Ministry of Knowledge Economy (MKE, Korea)
- Korea Evaluation Institute of Industrial Technology (KEIT) [10035296] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [2E2274] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Bright dual-mode green-emitting core/shell nanoparticles (NPs) were synthesized by doping selective set of lanthanide ions. Up-conversion (UC) green-emitting beta-NaY0.2Gd0.6F4:Yb-0.18,Er-0.02 NPs (8.3 nm) were used as core material. Bright down-conversion (DC) green-emitting beta-NaGd0.8F4:Ce-0.15,Tb-0.05 NPs showed ca. 31 times higher photoluminescence (PL) intensity than beta-NaGdF4:Tb NPs and they were served as shell material with their excellent PL properties. The UC/DC core/shell NPs showed bright green light under excitations of 980 nm near infrared (NIR) light and 254 nm ultraviolet (UV) light, respectively. The UC/DC core/shell NPs showed ca. 11 times higher UC PL intensity than core UCNPs. Consequently, the core/shell NPs doped with selective set of lanthanide ions showed bright dual-mode green emission under excitations of NIR light and UV light, indicating that they are promising for application to optical imaging. (C) 2012 Optical Society of America
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