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On the decay time of upconversion luminescence
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.
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2019 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 11, no 11, p. 4959-4969Article in journal (Refereed) Published
Abstract [en]

In this study, we systematically investigate the decay characteristics of upconversion luminescence (UCL) under anti-Stokes excitation through numerical simulations based on rate-equation models. We find that a UCL decay profile generally involves contributions from the sensitizer's excited-state lifetime, energy transfer and cross-relaxation processes. It should thus be regarded as the overall temporal response of the whole upconversion system to the excitation function rather than the intrinsic lifetime of the luminescence emitting state. Only under certain conditions, such as when the effective lifetime of the sensitizer's excited state is significantly shorter than that of the UCL emitting state and of the absence of cross-relaxation processes involving the emitting energy level, the UCL decay time approaches the intrinsic lifetime of the emitting state. Subsequently, Stokes excitation is generally preferred in order to accurately quantify the intrinsic lifetime of the emitting state. However, possible cross-relaxation between doped ions at high doping levels can complicate the decay characteristics of the luminescence and even make the Stokes-excitation approach fail. A strong cross-relaxation process can also account for the power dependence of the decay characteristics of UCL.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019. Vol. 11, no 11, p. 4959-4969
National Category
Nano Technology
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URN: urn:nbn:se:kth:diva-246212DOI: 10.1039/C8NR10332AISI: 000462669600033Scopus ID: 2-s2.0-85062877182OAI: oai:DiVA.org:kth-246212DiVA, id: diva2:1296688
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QC 20190318

Available from: 2019-03-16 Created: 2019-03-16 Last updated: 2019-04-30Bibliographically approved

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