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Global analysis of quenching of the time-resolved emission of ZnO nanocrystals by adsorbed rhodamine B on the basis of Tachiya theory

Kumar, Pushpendra; Pascher, Torbjörn LU ; Tachiya, M. and Pal, Suman Kalyan (2015) In Journal of Photochemistry and Photobiology, A: Chemistry 296. p.35-39
Abstract
Normally dye molecules are adsorbed onto the nanocrystal (NC) surface in dye-NC mixed solution, but it is very unlikely that all dye molecules present in the solution will be attached to NCs. The distribution of dye molecules on the NC surface is an important factor to take into account while investigating the quenching of NC emission via energy transfer to adsorbed dye molecules. Here, we analysed time-resolved fluorescence data of ZnO NCs in the presence of rhodamine B (RhB) using Tachiya theory, which assumes the Poisson distribution of dye molecules among the NCs. Energy transfer rate from NC to a dye molecule was found to be much faster than the intrinsic fluorescence decay rate of NCs and fluorescence quenching rate due to intrinsic... (More)
Normally dye molecules are adsorbed onto the nanocrystal (NC) surface in dye-NC mixed solution, but it is very unlikely that all dye molecules present in the solution will be attached to NCs. The distribution of dye molecules on the NC surface is an important factor to take into account while investigating the quenching of NC emission via energy transfer to adsorbed dye molecules. Here, we analysed time-resolved fluorescence data of ZnO NCs in the presence of rhodamine B (RhB) using Tachiya theory, which assumes the Poisson distribution of dye molecules among the NCs. Energy transfer rate from NC to a dye molecule was found to be much faster than the intrinsic fluorescence decay rate of NCs and fluorescence quenching rate due to intrinsic trap states present in the NC. The association constant was also calculated to acquire information on the nature of association of dye molecules with NCs. (C) 2014 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Energy transfer, Tachiya model, ZnO NCs, Trap states, Time-resolved, fluorescence, TCSPC
in
Journal of Photochemistry and Photobiology, A: Chemistry
volume
296
pages
35 - 39
publisher
Elsevier
external identifiers
  • wos:000346891400005
  • scopus:84908006014
ISSN
1873-2666
DOI
10.1016/j.jphotochem.2014.09.011
language
English
LU publication?
yes
id
1a7259a1-e799-4286-bf2b-c00ec43e3a23 (old id 5085234)
date added to LUP
2015-02-26 12:37:16
date last changed
2017-01-01 06:08:42
@article{1a7259a1-e799-4286-bf2b-c00ec43e3a23,
  abstract     = {Normally dye molecules are adsorbed onto the nanocrystal (NC) surface in dye-NC mixed solution, but it is very unlikely that all dye molecules present in the solution will be attached to NCs. The distribution of dye molecules on the NC surface is an important factor to take into account while investigating the quenching of NC emission via energy transfer to adsorbed dye molecules. Here, we analysed time-resolved fluorescence data of ZnO NCs in the presence of rhodamine B (RhB) using Tachiya theory, which assumes the Poisson distribution of dye molecules among the NCs. Energy transfer rate from NC to a dye molecule was found to be much faster than the intrinsic fluorescence decay rate of NCs and fluorescence quenching rate due to intrinsic trap states present in the NC. The association constant was also calculated to acquire information on the nature of association of dye molecules with NCs. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Kumar, Pushpendra and Pascher, Torbjörn and Tachiya, M. and Pal, Suman Kalyan},
  issn         = {1873-2666},
  keyword      = {Energy transfer,Tachiya model,ZnO NCs,Trap states,Time-resolved,fluorescence,TCSPC},
  language     = {eng},
  pages        = {35--39},
  publisher    = {Elsevier},
  series       = {Journal of Photochemistry and Photobiology, A: Chemistry},
  title        = {Global analysis of quenching of the time-resolved emission of ZnO nanocrystals by adsorbed rhodamine B on the basis of Tachiya theory},
  url          = {http://dx.doi.org/10.1016/j.jphotochem.2014.09.011},
  volume       = {296},
  year         = {2015},
}