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|Title:||Tuning upconversion through energy migration in core-shell nanoparticles||Authors:||Wang, F.
|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. https://doi.org/10.1038/nmat3149||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||URI:||http://scholarbank.nus.edu.sg/handle/10635/77323||ISSN:||14761122||DOI:||10.1038/nmat3149|
|Appears in Collections:||Staff Publications|
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