A1 Refereed original research article in a scientific journal
Frequency-Domain Method for Characterization of Upconversion Luminescence Kinetics
Authors: Labrador-Páez Lucía, Kankare Jouko, Hyppänen Iko, Soukka Tero, Andresen Elina, Resch-Genger Ute, Widengren Jerker, Liu Haichun
Publisher: AMER CHEMICAL SOC
Publication year: 2023
Journal: Journal of Physical Chemistry Letters
Journal name in source: JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Journal acronym: J PHYS CHEM LETT
Volume: 14
Issue: 14
First page : 3436
Last page: 3444
Number of pages: 9
ISSN: 1948-7185
DOI: https://doi.org/10.1021/acs.jpclett.3c002693436
Web address : https://doi.org/10.1021/acs.jpclett.3c00269
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/179460051
The frequency-domain (FD) method provides an alternative to the commonly used time-domain (TD) approach in characterizing the luminescence kinetics of luminophores, with its own strengths, e.g., the capability to decouple multiple lifetime components with higher reliability and accuracy. While extensively explored for characterizing luminophores with down-shifted emission, this method has not been investigated for studying nonlinear luminescent materials such as lanthanide-doped upconversion nanoparticles (UCNPs), featuring more complicated kinetics. In this work, employing a simplified rate-equation model representing a standard two-photon energy-transfer upconversion process, we thoroughly analyzed the response of the luminescence of UCNPs in the FD method. We found that the FD method can potentially obtain from a single experiment the effective decay rates of three critical energy states of the sensitizer/activator ions involved in the upconversion process. The validity of the FD method is demonstrated by experimental data, agreeing reasonably well with the results obtained by TD methods.
Downloadable publication This is an electronic reprint of the original article. |  |
