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Upconversion luminescence of CdTe nanoparticles

Joly, A G; Chen, W; McCready, D E; Malm, Jan-Olle LU and Bovin, Jan-Olov LU (2005) In Physical Review B (Condensed Matter and Materials Physics) 71(16). p.1-165304
Abstract
Efficient upconversion luminescence is observed from CdTe nanoparticles in solution and precipitated as solids. In the solids, the upconversion luminescence spectrum is significantly red shifted relative to the photoluminescence spectrum, whereas in solution, there is very little spectral shift. The upconversion luminescence exhibits a near-quadratic laser power dependence, both at room temperature and at 10 K. Both the upconversion and photoluminescence show similar decay dynamics with the solid samples showing shorter lifetimes compared to the solutions. This lifetime shortening is attributed to surface-state quenching. These results indicate that two-photon excitation is the likely upconversion excitation mechanism in these particles... (More)
Efficient upconversion luminescence is observed from CdTe nanoparticles in solution and precipitated as solids. In the solids, the upconversion luminescence spectrum is significantly red shifted relative to the photoluminescence spectrum, whereas in solution, there is very little spectral shift. The upconversion luminescence exhibits a near-quadratic laser power dependence, both at room temperature and at 10 K. Both the upconversion and photoluminescence show similar decay dynamics with the solid samples showing shorter lifetimes compared to the solutions. This lifetime shortening is attributed to surface-state quenching. These results indicate that two-photon excitation is the likely upconversion excitation mechanism in these particles and that phonon-populated trap states do not contribute to the upconversion. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
71
issue
16
pages
1 - 165304
publisher
American Physical Society
external identifiers
  • wos:000228763100056
  • scopus:28744445696
ISSN
1098-0121
DOI
10.1103/PhysRevB.71.165304
language
English
LU publication?
yes
id
a4305bf4-4459-43ff-aaac-bd5c141ec151 (old id 152205)
date added to LUP
2007-07-13 12:39:10
date last changed
2017-07-23 04:33:09
@article{a4305bf4-4459-43ff-aaac-bd5c141ec151,
  abstract     = {Efficient upconversion luminescence is observed from CdTe nanoparticles in solution and precipitated as solids. In the solids, the upconversion luminescence spectrum is significantly red shifted relative to the photoluminescence spectrum, whereas in solution, there is very little spectral shift. The upconversion luminescence exhibits a near-quadratic laser power dependence, both at room temperature and at 10 K. Both the upconversion and photoluminescence show similar decay dynamics with the solid samples showing shorter lifetimes compared to the solutions. This lifetime shortening is attributed to surface-state quenching. These results indicate that two-photon excitation is the likely upconversion excitation mechanism in these particles and that phonon-populated trap states do not contribute to the upconversion.},
  author       = {Joly, A G and Chen, W and McCready, D E and Malm, Jan-Olle and Bovin, Jan-Olov},
  issn         = {1098-0121},
  language     = {eng},
  number       = {16},
  pages        = {1--165304},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Upconversion luminescence of CdTe nanoparticles},
  url          = {http://dx.doi.org/10.1103/PhysRevB.71.165304},
  volume       = {71},
  year         = {2005},
}