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Title: Tuning upconversion through energy migration in core-shell nanoparticles
Authors: Wang, F. 
Deng, R.
Wang, J.
Wang, Q.
Han, Y.
Zhu, H.
Chen, X.
Liu, X. 
Issue Date: Dec-2011
Citation: Wang, F., Deng, R., Wang, J., Wang, Q., Han, Y., Zhu, H., Chen, X., Liu, X. (2011-12). Tuning upconversion through energy migration in core-shell nanoparticles. Nature Materials 10 (12) : 968-973. ScholarBank@NUS Repository.
Abstract: Photon upconversion is promising for applications such as biological imaging, data storage or solar cells. Here, we have investigated upconversion processes in a broad range of gadolinium-based nanoparticles of varying composition. We show that by rational design of a core-shell structure with a set of lanthanide ions incorporated into separated layers at precisely defined concentrations, efficient upconversion emission can be realized through gadolinium sublattice-mediated energy migration for a wide range of lanthanide activators without long-lived intermediary energy states. Furthermore, the use of the core-shell structure allows the elimination of deleterious cross-relaxation. This effect enables fine-tuning of upconversion emission through trapping of the migrating energy by the activators. Indeed, the findings described here suggest a general approach to constructing a new class of luminescent materials with tunable upconversion emissions by controlled manipulation of energy transfer within a nanoscopic region. © 2011 Macmillan Publishers Limited. All rights reserved.
Source Title: Nature Materials
ISSN: 14761122
DOI: 10.1038/nmat3149
Appears in Collections:Staff Publications

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