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Balancing power density based quantum yield characterization of upconverting nanoparticles for arbitrary excitation intensities.

Liu, Haichun LU ; Xu, Can LU ; Lindgren, David LU ; Xie, Haiyan LU ; Thomas, Diana LU ; Gundlach, Carsten LU and Andersson-Engels, Stefan LU (2013) In Nanoscale 5(11). p.4770-4775
Abstract
Upconverting nanoparticles (UCNPs) have recently shown great potential as contrast agents in biological applications. In developing different UCNPs, the characterization of their quantum yield (QY) is a crucial issue, as the typically drastic decrease in QY for low excitation power densities can either impose a severe limitation or provide an opportunity in many applications. The power density dependence of the QY is governed by the competition between the energy transfer upconversion (ETU) rate and the linear decay rate in the depopulation of the intermediate state of the involved activator in the upconversion process. Here we show that the QYs of Yb(3+) sensitized two-photon upconversion emissions can be well characterized by the... (More)
Upconverting nanoparticles (UCNPs) have recently shown great potential as contrast agents in biological applications. In developing different UCNPs, the characterization of their quantum yield (QY) is a crucial issue, as the typically drastic decrease in QY for low excitation power densities can either impose a severe limitation or provide an opportunity in many applications. The power density dependence of the QY is governed by the competition between the energy transfer upconversion (ETU) rate and the linear decay rate in the depopulation of the intermediate state of the involved activator in the upconversion process. Here we show that the QYs of Yb(3+) sensitized two-photon upconversion emissions can be well characterized by the balancing power density, at which the ETU rate and the linear decay rate have equal contributions, and its corresponding QY. The results in this paper provide a method to fully describe the QY of upconverting nanoparticles for arbitrary excitation power densities, and is a fast and simple approach for assessing the applicability of UCNPs from the perspective of energy conversion. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale
volume
5
issue
11
pages
4770 - 4775
publisher
Royal Society of Chemistry
external identifiers
  • wos:000319008700027
  • pmid:23604490
  • scopus:84878128884
ISSN
2040-3372
DOI
10.1039/c3nr00469d
language
English
LU publication?
yes
id
4794f856-b9a4-427a-946f-8f45d2802388 (old id 3733521)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/23604490?dopt=Abstract
date added to LUP
2013-05-04 20:03:49
date last changed
2019-03-12 01:07:20
@article{4794f856-b9a4-427a-946f-8f45d2802388,
  abstract     = {Upconverting nanoparticles (UCNPs) have recently shown great potential as contrast agents in biological applications. In developing different UCNPs, the characterization of their quantum yield (QY) is a crucial issue, as the typically drastic decrease in QY for low excitation power densities can either impose a severe limitation or provide an opportunity in many applications. The power density dependence of the QY is governed by the competition between the energy transfer upconversion (ETU) rate and the linear decay rate in the depopulation of the intermediate state of the involved activator in the upconversion process. Here we show that the QYs of Yb(3+) sensitized two-photon upconversion emissions can be well characterized by the balancing power density, at which the ETU rate and the linear decay rate have equal contributions, and its corresponding QY. The results in this paper provide a method to fully describe the QY of upconverting nanoparticles for arbitrary excitation power densities, and is a fast and simple approach for assessing the applicability of UCNPs from the perspective of energy conversion.},
  author       = {Liu, Haichun and Xu, Can and Lindgren, David and Xie, Haiyan and Thomas, Diana and Gundlach, Carsten and Andersson-Engels, Stefan},
  issn         = {2040-3372},
  language     = {eng},
  number       = {11},
  pages        = {4770--4775},
  publisher    = {Royal Society of Chemistry},
  series       = {Nanoscale},
  title        = {Balancing power density based quantum yield characterization of upconverting nanoparticles for arbitrary excitation intensities.},
  url          = {http://dx.doi.org/10.1039/c3nr00469d},
  volume       = {5},
  year         = {2013},
}