Significant Enhancement of the Upconversion Emission in Highly Er3+ -Doped Nanoparticles at Cryogenic Temperatures.

Tu, L; Wu, K; Luo, Y; Wang, E; Yuan, J; Zuo, J; Zhou, D; Li, B; Zhou, J; Jin, D; Zhang, H

Significant Enhancement of the Upconversion Emission in Highly Er3+ -Doped Nanoparticles at Cryogenic Temperatures.

Tu, L Wu, K Luo, Y Wang, E Yuan, J Zuo, J Zhou, D Li, B Zhou, J

Jin, D

Zhang, H

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Publisher:: WILEY-V C H VERLAG GMBH
Publication Type:: Journal Article
Citation:: Angew Chem Int Ed Engl, 2023, 62, (7), pp. e202217100
Issue Date:: 2023-02-06

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Field	Value	Language
dc.contributor.author	Tu, L
dc.contributor.author	Wu, K
dc.contributor.author	Luo, Y
dc.contributor.author	Wang, E
dc.contributor.author	Yuan, J
dc.contributor.author	Zuo, J
dc.contributor.author	Zhou, D
dc.contributor.author	Li, B
dc.contributor.author	Zhou, J https://orcid.org/0000-0002-0605-5745
dc.contributor.author	Jin, D https://orcid.org/0000-0003-1046-2666
dc.contributor.author	Zhang, H
dc.date.accessioned	2024-02-09T00:13:15Z
dc.date.available	2024-02-09T00:13:15Z
dc.date.issued	2023-02-06
dc.identifier.citation	Angew Chem Int Ed Engl, 2023, 62, (7), pp. e202217100
dc.identifier.issn	1433-7851
dc.identifier.issn	1521-3773
dc.identifier.uri	http://hdl.handle.net/10453/175529
dc.description.abstract	Relatively low efficiency is the bottleneck for the application of lanthanide-doped upconversion nanoparticles (UCNPs). The high-level doping strategy realized in recent years has not improved the efficiency as much as expected. It is argued that cross relaxation (CR) is not detrimental to upconversion. Here we combine theoretical simulation and spectroscopy to elucidate the role of CR in upconversion process of Er3+ highly doped (HD) UCNPs. It is found that if CR is purposively suppressed, upconversion efficiency can be significantly improved. Specifically, we demonstrate experimentally that inhibition of CR by introducing cryogenic environment (40 K) enhances upconversion emission by more than two orders of magnitude. This work not only elucidates the nature of CR and its non-negligible adverse effects, but also provides a new perspective for improving upconversion efficiency. The result can be directly applied to cryogenic imaging and wide range temperature sensing.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	WILEY-V C H VERLAG GMBH
dc.relation.ispartof	Angew Chem Int Ed Engl
dc.relation.isbasedon	10.1002/anie.202217100
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	03 Chemical Sciences
dc.subject.classification	Organic Chemistry
dc.subject.classification	34 Chemical sciences
dc.title	Significant Enhancement of the Upconversion Emission in Highly Er3+ -Doped Nanoparticles at Cryogenic Temperatures.
dc.type	Journal Article
utslib.citation.volume	62
utslib.location.activity	Germany
utslib.for	03 Chemical Sciences
pubs.organisational-group	University of Technology Sydney
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	open_access	*
dc.date.updated	2024-02-09T00:13:13Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	62
utslib.citation.issue	7

Abstract:

Relatively low efficiency is the bottleneck for the application of lanthanide-doped upconversion nanoparticles (UCNPs). The high-level doping strategy realized in recent years has not improved the efficiency as much as expected. It is argued that cross relaxation (CR) is not detrimental to upconversion. Here we combine theoretical simulation and spectroscopy to elucidate the role of CR in upconversion process of Er3+ highly doped (HD) UCNPs. It is found that if CR is purposively suppressed, upconversion efficiency can be significantly improved. Specifically, we demonstrate experimentally that inhibition of CR by introducing cryogenic environment (40 K) enhances upconversion emission by more than two orders of magnitude. This work not only elucidates the nature of CR and its non-negligible adverse effects, but also provides a new perspective for improving upconversion efficiency. The result can be directly applied to cryogenic imaging and wide range temperature sensing.

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http://hdl.handle.net/10453/175529