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(a) Schematic representation optical storage using the core-shell nanoparticle; (b) the internal structure of the core-shell nanoparticle (left) and the schematic diagram of energy transfer pathways between the lanthanide dopants (right); (c) upconversion luminescence images of 3 different nanoparticles; (d) the luminescence lifetimes of Yb3+ doped nanoparticles with different structures [65].
