Emission stability and reversibility of upconversion nanocrystals

Liu, D; Xu, X; Wang, F; Zhou, J; Mi, C; Zhang, L; Lu, Y; Ma, C; Goldys, E; Lin, J; Jin, D

Emission stability and reversibility of upconversion nanocrystals

Liu, D Xu, X

Wang, F

Zhou, J

Mi, C Zhang, L Lu, Y Ma, C Goldys, E Lin, J Jin, D

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Publication Type:: Journal Article
Citation:: Journal of Materials Chemistry C, 2016, 4 (39), pp. 9227 - 9234
Issue Date:: 2016-01-01

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Field	Value	Language
dc.contributor.author	Liu, D	en_US
dc.contributor.author	Xu, X https://orcid.org/0000-0002-2598-3766	en_US
dc.contributor.author	Wang, F https://orcid.org/0000-0001-7403-3305	en_US
dc.contributor.author	Zhou, J https://orcid.org/0000-0002-0605-5745	en_US
dc.contributor.author	Mi, C	en_US
dc.contributor.author	Zhang, L	en_US
dc.contributor.author	Lu, Y	en_US
dc.contributor.author	Ma, C	en_US
dc.contributor.author	Goldys, E	en_US
dc.contributor.author	Lin, J	en_US
dc.contributor.author	Jin, D https://orcid.org/0000-0003-1046-2666	en_US
dc.date.issued	2016-01-01	en_US
dc.identifier.citation	Journal of Materials Chemistry C, 2016, 4 (39), pp. 9227 - 9234	en_US
dc.identifier.issn	2050-7534	en_US
dc.identifier.uri	http://hdl.handle.net/10453/103327
dc.description.abstract	© 2016 The Royal Society of Chemistry. Rare-earth doped upconversion nanocrystals have emerged as a novel class of luminescent probes for biomedical applications. The knowledge about their optical stability in aqueous solution under different pH and temperature conditions has not been comprehensively explored. Here we conduct a systematic investigation and report the emission stability and reversibility of typical NaYF4:Yb3+,Er3+ nanocrystals and their core-shell nanostructures in aqueous solution at different temperatures and with different pH values. These nanocrystals show reversible luminescence response to temperature changes, while low pH permanently quenches their luminescence. With the addition of inert shells, with thicknesses ranging from 1.5 nm to 8 nm, the emission stability and reversibility change significantly. Thicker inert shells not only lead to a significant enhancement in the emission intensity but also stabilize its optical responses which become less affected by temperature variations and pH conditions. This study suggests that upconversion nanocrystal-based sensitive temperature and pH sensors do not generally benefit from the core-shell structure usually recommended for enhanced upconversion luminescence.	en_US
dc.relation	http://purl.org/au-research/grants/arc/FT130100517
dc.relation.ispartof	Journal of Materials Chemistry C	en_US
dc.relation.isbasedon	10.1039/c6tc02990f	en_US
dc.title	Emission stability and reversibility of upconversion nanocrystals	en_US
dc.type	Journal Article
utslib.citation.volume	39	en_US
utslib.citation.volume	4	en_US
utslib.for	1007 Nanotechnology	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0306 Physical Chemistry (incl. Structural)	en_US
utslib.for	0912 Materials 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
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	closed_access
pubs.issue	39	en_US
pubs.publication-status	Published	en_US
pubs.volume	4	en_US

Abstract:

© 2016 The Royal Society of Chemistry. Rare-earth doped upconversion nanocrystals have emerged as a novel class of luminescent probes for biomedical applications. The knowledge about their optical stability in aqueous solution under different pH and temperature conditions has not been comprehensively explored. Here we conduct a systematic investigation and report the emission stability and reversibility of typical NaYF4:Yb3+,Er3+ nanocrystals and their core-shell nanostructures in aqueous solution at different temperatures and with different pH values. These nanocrystals show reversible luminescence response to temperature changes, while low pH permanently quenches their luminescence. With the addition of inert shells, with thicknesses ranging from 1.5 nm to 8 nm, the emission stability and reversibility change significantly. Thicker inert shells not only lead to a significant enhancement in the emission intensity but also stabilize its optical responses which become less affected by temperature variations and pH conditions. This study suggests that upconversion nanocrystal-based sensitive temperature and pH sensors do not generally benefit from the core-shell structure usually recommended for enhanced upconversion luminescence.

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http://hdl.handle.net/10453/103327