Integrated Strategy for High Luminescence Intensity of Upconversion Nanocrystals

Yang, Y; Zhu, Y; Zhou, J; Wang, F; Qiu, J

Integrated Strategy for High Luminescence Intensity of Upconversion Nanocrystals

Yang, Y Zhu, Y Zhou, J

Wang, F

Qiu, J

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Publication Type:: Journal Article
Citation:: ACS Photonics, 2017, 4 (8), pp. 1930 - 1936
Issue Date:: 2017-08-16

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Field	Value	Language
dc.contributor.author	Yang, Y	en_US
dc.contributor.author	Zhu, Y	en_US
dc.contributor.author	Zhou, J https://orcid.org/0000-0002-0605-5745	en_US
dc.contributor.author	Wang, F https://orcid.org/0000-0001-7403-3305	en_US
dc.contributor.author	Qiu, J	en_US
dc.date.issued	2017-08-16	en_US
dc.identifier.citation	ACS Photonics, 2017, 4 (8), pp. 1930 - 1936	en_US
dc.identifier.uri	http://hdl.handle.net/10453/117544
dc.description.abstract	© 2017 American Chemical Society. The growing applications of upconversion nanocrystals in bioimaging, therapeutics, and photonics have given rise to a demand of high quality nanocrystals with desirable luminescence intensity. Although the design of optimal nanocrystals such as core-shell nanostructures has improved the intensity, the internal links between dopant concentration balance, epitaxial growth protection, and shell thickness effect encounter a compromised situation that lacks of integrated consideration and comprehensive assessment. Here we propose an integrated strategy based on a core-shell design for the enhancement of upconversion luminescence intensity. Epitaxial protection can enable higher activator accommodation capacity in limited spatial scale, which leads to an Er3+ concentration threshold improvement in β-NaYF4 core-shell nanocrystals from 2 to 6 mol %. We further perform a comprehensive assessment of the nanocrystals with convincing performance improvement in ensemble spectroscopic intensity, upconversion quantum yield, and single nanocrystal intensity. Our findings provide improved understanding of electronic behaviors in multiphoton upconversion and opportunities for diverse applications requiring high quality upconversion nanocrystals.	en_US
dc.relation.ispartof	ACS Photonics	en_US
dc.relation.isbasedon	10.1021/acsphotonics.7b00123	en_US
dc.title	Integrated Strategy for High Luminescence Intensity of Upconversion Nanocrystals	en_US
dc.type	Journal Article
utslib.citation.volume	8	en_US
utslib.citation.volume	4	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0206 Quantum Physics	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - IBMD - Initiative for Biomedical Devices
utslib.copyright.status	closed_access
pubs.issue	8	en_US
pubs.publication-status	Published	en_US
pubs.volume	4	en_US

Abstract:

© 2017 American Chemical Society. The growing applications of upconversion nanocrystals in bioimaging, therapeutics, and photonics have given rise to a demand of high quality nanocrystals with desirable luminescence intensity. Although the design of optimal nanocrystals such as core-shell nanostructures has improved the intensity, the internal links between dopant concentration balance, epitaxial growth protection, and shell thickness effect encounter a compromised situation that lacks of integrated consideration and comprehensive assessment. Here we propose an integrated strategy based on a core-shell design for the enhancement of upconversion luminescence intensity. Epitaxial protection can enable higher activator accommodation capacity in limited spatial scale, which leads to an Er3+ concentration threshold improvement in β-NaYF4 core-shell nanocrystals from 2 to 6 mol %. We further perform a comprehensive assessment of the nanocrystals with convincing performance improvement in ensemble spectroscopic intensity, upconversion quantum yield, and single nanocrystal intensity. Our findings provide improved understanding of electronic behaviors in multiphoton upconversion and opportunities for diverse applications requiring high quality upconversion nanocrystals.

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http://hdl.handle.net/10453/117544