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Change in the emission saturation and kinetics of upconversion nanoparticles under different light irradiations
KTH, School of Engineering Sciences (SCI), Applied Physics. Photonics Laboratory, Physics Department, Kharazmi University, Tehran, Iran.ORCID iD: 0000-0002-8209-1449
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.ORCID iD: 0000-0001-6966-9077
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
Centre for Optical and Electromagnetic Research, Guangdong Provincial Key Laboratory of Optical Information.
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2019 (English)In: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 97, article id 109389Article in journal (Refereed) Published
Abstract [en]

Nd3+-sensitized upconversion nanoparticles (UCNPs) can be excited by both 980 and 808 nm light, which is regarded as a particularly advantageous property of these particles. In this work, we demonstrate that the nanoparticles can exhibit significantly different response when excited at these two excitation wavelengths, showing dependence on the intensity of the excitation light and the way it is distributed in time. Specifically, with 808 nm excitation saturation in the emitted luminescence is more readily reached with increasing excitation intensities than upon 980 nm excitation. This is accompanied by delayed upconversion luminescence (UCL) kinetics and weaker UCL intensities. The different luminescence response at 808 and 980 nm excitation reported in this work is relevant in a manifold of applications using UCNPs as labels and sensors. This could also open new possibilities for multi-wavelength excitable UCNPs for upconversion color display and in laser-scanning microscopy providing selective readouts and sub-sectioning of samples.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 97, article id 109389
Keywords [en]
Color tunability, Kinetics, Laser scanning microscopy, Saturation, Upconversion, Enzyme kinetics, Laser applications, Luminescence, Nanoparticles, Saturation (materials composition), Excitation intensity, Excitation wavelength, Multi-wavelengths, Up-conversion, Upconversion luminescence, Upconversion nanoparticles, Light
National Category
Theoretical Chemistry Atom and Molecular Physics and Optics
Research subject
Theoretical Chemistry and Biology; Physics, Theoretical Physics
Identifiers
URN: urn:nbn:se:kth:diva-263500DOI: 10.1016/j.optmat.2019.109389ISI: 000501396600023Scopus ID: 2-s2.0-85072543021OAI: oai:DiVA.org:kth-263500DiVA, id: diva2:1375683
Funder
Swedish Research Council, 2016-03804Swedish Foundation for Strategic Research , SSF ITM17-0491ÅForsk (Ångpanneföreningen's Foundation for Research and Development), 19-424
Note

QC 20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2020-01-13Bibliographically approved

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Bagheri, ShervinLiu, Q.ingyunBergstrand, JanÅgren, HansLiu, HaichunWidengren, Jerker

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Theoretical ChemistryAtom and Molecular Physics and Optics

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