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Photon Upconversion Kinetic Nanosystems and Their Optical Response
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology. Royal Institute of Technology.
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2018 (English)In: Laser & Photonics reviews, ISSN 1863-8880, E-ISSN 1863-8899, Vol. 12, no 1, article id 1700144Article, review/survey (Refereed) Published
Abstract [en]

Lanthanide-doped photon upconversion nanoparticles (UCNPs) are capable of converting low-intensity near-infrared light to UV and visible emission through the synergistic effects of light excitation and mutual interactions between doped ions. UCNPs have attracted strong interest as unique spectrum converters and found a multitude of applications in areas like biomedical imaging, energy harvesting and information technology. UCNPs are distinct from many other types of luminescent materials in terms of the involvement of a host lattice and multiple optical centers, i.e., trivalent lanthanide ions with manyfolds of accessible long-lived energy states, in individual nanoparticles. The mutual interactions between these optical centers, i.e., sequential energy transfers, make them operate as an integrated unit and co-determine the luminescence kinetics and other optical properties of the individual nanoparticle. Thus, each nanoparticle consititutes a kinetic optical system. In this work, we explore UCNPs from the outset of being such kinetic optical systems and review their physical formation, the underlying photophysics, macroscopic statistical description, and their response to various optical stimuli in the spectral, polarization, intensity, temporal and frequency domains, and demonstrate ways that their optical output can be optimized by manipulating the excitation schemes. Our review highlights upconversion nanotechnology as an interdisciplinary field across chemistry, physics and biomedical engineering, with great future possibilities, flexibility and ramifications. We outline some of the potential directions of upconversion nanoparticle research.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 12, no 1, article id 1700144
Keyword [en]
excitation manipulation, kinetics, modulation, upconversion
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-217899DOI: 10.1002/lpor.201700144ISI: 000419666500004Scopus ID: 2-s2.0-85034232861OAI: oai:DiVA.org:kth-217899DiVA, id: diva2:1158239
Funder
Swedish Research Council, 2015-00160;2016-03804
Note

QC 20171206

Available from: 2017-11-18 Created: 2017-11-18 Last updated: 2018-01-29Bibliographically approved

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