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Lutetium—hafnium dating is a geochronological dating method utilizing the radioactive decay system of lutetium — to hafnium — The trace concentration of the Lu and Hf in earth materials posed some technological difficulties in using Lu—Hf dating extensively in the s. Lutetium is a rare-earth elementwith one naturally-occurring stable isotope Lu and one naturally-occurring radioactive isotope Lu. An age equation is set up for every radiometric dating technique to describe the mathematical relationship of the number of parent and daughter nuclide.

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The realization of upconversion at nm excitation has shown great advantages in advancing the broad bioapplications of lanthanide-doped nanomaterials. We find that energy migration over the ytterbium sublattice plays a key role in facilitating the energy transportation, and moreover, we show that the interfacial energy transfer occurring at the core-shell interface also has a contribution to the upconversion. By optimizing the dopant concentration and surface anchoring the infrared indocyanine green dye, the nm responsive upconversion is markedly enhanced.

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