Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 135, Issue 34, Pages 12608-12611Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja4075002
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Funding
- National University of Singapore [R-143-000-427]
- Ministry of Education [R-143-000-453]
- Singapore-MIT Alliance
- Agency for Science, Technology, and Research [R-143-000-366]
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A new type of core-shell upconversion nanoparticles which can be effectively excited at 795 nm has been designed and synthesized through spatially confined doping of neodymium (Nd3+) ions. The use of Nd3+ ions as sensitizers facilitates the energy transfer and photon upconversion of a series of lanthanide activators (Er3+, Tm3+, and Ho3+) at a biocompatible excitation wavelength (795 nm) and also significantly minimizes the overheating problem associated with conventional 980 nm excitation. Importantly, the core shell design enabled high-concentration doping of Nd3+ (similar to 20 mol %) in the shell layer and thus markedly enhanced the upconversion emission from the activators, providing highly attractive luminescent biomarkers for bioimaging without autofluorescence and concern of overheating.
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