4.6 Article

Energy transfer mechanism dominated by the doping location of activators in rare-earth upconversion nanoparticles

期刊

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 20, 期 25, 页码 17141-17147

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cp02142b

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  1. National Natural Science Foundation of China [21373268, 21227803]
  2. Renmin University of China [15XNLQ04, 10XNI007]

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Research on the energy transfer mechanism of rare-earth-doped upconversion nanoparticles (UCNPs) has been an important area due to the increasing demand for tuning multicolor emission and enhancing the upconversion efficiency; however, because of large energy mismatch, many lanthanide activators, such as Eu3+, cannot realize highly efficient near infrared-to-visible upconversion by simple codoping of Yb3+. Therefore, introduction of other ions to assist the energy transfer process is required. Herein, we prepared core-shell nanoparticles with different doping locations to investigate the upconversion energy transfer mechanism. The upconversion luminescence (UCL) of core-shell nanoparticles was investigated by steady-state luminescence and time-resolved luminescence spectra. The UCL behaviors in these different multi-activator core-shell nanoparticles were observed. The results revealed different energy transfer channels influenced by the doping location of activators. This study may open up new avenues of structure design for fine-tuning of multicolor UCL for specific applications.

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