Single particle spectroscopy of directionally grown upconversion nanostructures

Cai, Yangjian

Single particle spectroscopy of directionally grown upconversion nanostructures

Cai, Yangjian

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Publication Type:: Thesis
Issue Date:: 2025

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Field	Value	Language
dc.contributor.author	Cai, Yangjian
dc.date.accessioned	2025-09-18T04:27:09Z
dc.date.available	2025-09-18T04:27:09Z
dc.date.issued	2025
dc.identifier.uri	http://hdl.handle.net/10453/189960
dc.description	University of Technology Sydney. Faculty of Science.	en_US.UTF-8
dc.description.abstract	Lanthanide-doped upconversion nanoparticles (UCNPs) have evolved significantly, transitioning from micro to nanoscale with an emphasis on anisotropic morphology. This thesis explores the critical influence of surface properties—ligands, coordination states, and coatings—on directional-grown UCNPs, particularly focusing on their single-particle behavior. The research highlights advancements in synthesis techniques, confocal microscopy for characterization, and the novel use of single-particle spectroscopy to study polarization effects and surface coating strategies. Key findings include the preservation of polarization features in nano-sized UCNPs and the efficacy of directional growth coatings in mitigating quenching effects compared to inert coatings. Challenges such as quantifying ligand capping densities and surface orientation variability are addressed using advanced spectroscopic techniques but remain partially unresolved. The thesis concludes by discussing unresolved properties dependent on morphology, the need for tailored characterization methods, and promising future applications in imaging and sensing technologies. Overall, this work contributes to understanding how surface modifications impact the optical and functional properties of UCNPs, paving the way for enhanced applications in diverse scientific and technological fields.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/189960/1/thesis.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	© 2025 Yangjian Cai
dc.rights	au.edu.uts.lib/cph
dc.title	Single particle spectroscopy of directionally grown upconversion nanostructures	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

Lanthanide-doped upconversion nanoparticles (UCNPs) have evolved significantly, transitioning from micro to nanoscale with an emphasis on anisotropic morphology. This thesis explores the critical influence of surface properties—ligands, coordination states, and coatings—on directional-grown UCNPs, particularly focusing on their single-particle behavior. The research highlights advancements in synthesis techniques, confocal microscopy for characterization, and the novel use of single-particle spectroscopy to study polarization effects and surface coating strategies. Key findings include the preservation of polarization features in nano-sized UCNPs and the efficacy of directional growth coatings in mitigating quenching effects compared to inert coatings. Challenges such as quantifying ligand capping densities and surface orientation variability are addressed using advanced spectroscopic techniques but remain partially unresolved. The thesis concludes by discussing unresolved properties dependent on morphology, the need for tailored characterization methods, and promising future applications in imaging and sensing technologies. Overall, this work contributes to understanding how surface modifications impact the optical and functional properties of UCNPs, paving the way for enhanced applications in diverse scientific and technological fields.

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http://hdl.handle.net/10453/189960