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Title: Unravelling the energy transfer of Er3+-self-sensitized upconversion in Er3+-Yb3+-Er3+ clustered core@shell nanoparticles
Authors: Huang, BL 
Sun, MZ 
Dougherty, AW 
Dong, H
Xu, YJ
Sun, LD
Yan, CH
Issue Date: 2017
Publisher: Royal Society of Chemistry
Source: Nanoscale, 14 Dec. 2017, v. 9, no. 46, p. 18490-18497 How to cite?
Journal: Nanoscale 
Abstract: Unravelling upconversion (UC) energy transfer mechanisms is significant for designing novel efficient anti-Stokes phosphors. We have studied the correlation of different lanthanide dopants within Er3+-self-sensitized core@shell upconversion nanoparticles (UCNPs). Here, our focus will be on high-concentration dopants that are able to sufficiently produce the clustering effect, especially within the interplay between Er3+ and Yb3+. We demonstrate that whatever the amount of the self-sensitizer (e.g., Er3+), abnormal absorption enhancement will occur as long as Yb3+ clusters are present. This effect originates from the substantial energy transfer between Yb3+-Yb3+ clusters despite the increased energy transfer from Yb3+ to Er3+. Therefore, the energy transfer efficiency is still constrained. However, we conversely used one of the aforementioned quench-paths of UC energy transfer to easily transfer the energy from the in-shell shell layer to the in-core area with the assistance of the energy potential reservoir, which was given by the homogeneous core@shell band offset at the interface region. Indirectly, we actualize the Er3+ UC luminescence with self-sensitization through an extended energy transfer path. This work provides a solid support and analytic theory for unraveling the energy transfer mechanism from recent works on Er3+ self-sensitized UC luminescence.
ISSN: 2040-3364
EISSN: 2040-3372
DOI: 10.1039/c7nr06729a
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