Abstract
Effective coupling between upconversion nanoparticles (UCNPs) and localized surface plasmon resonance (LSPR) nanostructures have been successfully used to improve the upconversion luminescence (UCL) of lanthanide ions. Here, to explore a more effective coupling method between Cu1.8S and UCNPs, Cu1.8S@NaYF4: X%Yb3+@NaYF4: Yb3+, Er3+ nanoparticles were synthesized. In comparison to NaYF4@NaYF4: Yb3+, Er3+ nanoparticles, the UCL intensity of the green and red emissions of Cu1.8S@NaYF4: 30%Yb3+@NaYF4: Yb3+, Er3+ nanoparticles were conspicuously increased by ~28-fold and ~101-fold, respectively. The significant enhancement of UCL in Cu1.8S@NaYF4: 30%Yb3+@NaYF4: Yb3+, Er3+ nanoparticles comes from the synergistic contribution of two aspects: LSPR light scattering of the Cu1.8S core and the increased near-infrared absorption from the appropriate amount of Yb3+ ions in the intermediate layer. The present work is important for possible applications of such core-shell nanoparticles to photocatalysis, bioluminescent labeling, and perovskite solar cells.
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