On the decay time of upconversion luminescence

Huang, Bingru (author)

Würth, Christian (author)

Resch-Genger, Ute (author)

Zhan, Qiuqiang (author)

(creator_code:org_t)

Royal Society of Chemistry, 2019
2019
English.
In: Nanoscale. - : Royal Society of Chemistry. - 2040-3364 .- 2040-3372. ; 11:11, s. 4959-4969

Related links:: https://doi.org/10.1...; show more...; https://kth.diva-por... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

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.

By the author/editor: Bergstrand, Jan; Liu, Qingyun; Huang, Bingru; Würth, Christian; Resch-Genger, Ut ...; Zhan, Qiuqiang; show more...; Widengren, Jerke ...; Ågren, Hans; Liu, Haichun; show less...

About the subject

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