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Microlens array enhanced upconversion luminescence at low excitation irradiance
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.ORCID iD: 0000-0002-1780-7746
Harbin Inst Technol, Sch Chem & Chem Engn, Harbin, Heilongjiang, Peoples R China..
Soochow Univ, Sch Optoelect Sci & Engn, Suzhou 215006, Peoples R China.;Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Suzhou 215006, Peoples R China..
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2019 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 11, no 29, p. 14070-14078Article in journal (Refereed) Published
Abstract [en]

The dearth of high upconversion luminescence (UCL) intensity at low excitation irradiance hinders the prevalent application of lanthanide-doped upconversion nanoparticles (UCNPs) in many fields ranging from optical bioimaging to photovoltaics. In this work, we propose to use microlens arrays (MLAs) as spatial light modulators to manipulate the distribution of excitation light fields in order to increase UCL, taking advantage of its nonlinear response to the excitation irradiance. We show that multicolored UCL from NaYF4:Yb3+,Er3+@NaYF4:Yb3+,Nd3+ and NaYF4:Yb3+,Tm3+@NaYF4:Yb3+,Nd3+ core/shell UCNPs can be increased by more than one order of magnitude under either 980 or 808 nm excitation, by simply placing a polymeric MLA onto the top of these samples. The observed typical green (525/540 nm) and red (654 nm) UCL bands from Er3+ and a blue (450/475 nm) UCL band from Tm3+ exhibit distinct enhancement factors due to their different multi-photon processes. Importantly, our ray tracing simulation reveals that the MLA is able to spatially confine the excitation light (980 and 808 nm) by orders of magnitude, thus amplifying UCL by more than 225-fold (the 450 nm UCL band of Tm3+) at low excitation irradiance. The proposed MLA method has immediate ramifications for the improved performance of all types of UCNP-based devices, such as UCNP-enhanced dye sensitized solar cells demonstrated here.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2019. Vol. 11, no 29, p. 14070-14078
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Chemical Sciences
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URN: urn:nbn:se:kth:diva-256248DOI: 10.1039/c9nr03105gISI: 000477704400039PubMedID: 31313798Scopus ID: 2-s2.0-850696404912-s2.0-85069640491OAI: oai:DiVA.org:kth-256248DiVA, id: diva2:1364805
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QC 20191022

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-10-22Bibliographically approved

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Liu, HaichunÅgren, Hans

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