NDLI: Improved upconversion luminescence in β-NaGdF4: Er3+, Yb3+ nanoparticles: A new microwave-assisted synthesis in anhydrous ionic liquids

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Improved upconversion luminescence in β-NaGdF4: Er3+, Yb3+ nanoparticles: A new microwave-assisted synthesis in anhydrous ionic liquids

Content Provider	Semantic Scholar
Author	Tessitore, Gabriella Mudring, Anja Krämer, Karl W.
Copyright Year	2017
Abstract	A new microwave assisted synthesis of β-NaGdF4: Er3+, Yb3+ nanoparticles was investigated in ethylene glycol (EG) and ionic liquids (IL). Sub-10 nm nanoparticles with an intense green upconversion (UC) luminescence were synthesized. The UC intensity was strongly enhanced by changing the solvent from EG/IL mixture to pure IL, as well as the design from core to core/shell nanoparticles. The reaction in hydroxyl-free conditions reduces the number of oxygen impurities in the fluoride material. Protecting the particle surface by an undoped shell limits surface defects and shields the active core from contact with surface ligands which are required for solubility. Both decrease non-radiative losses and concomitantly yield a stronger UC emission. The UC emission is visible by eye already for low excitation power in sub-5 nm βNaGdF4: 2%Er3+, 18%Yb3+ nanoparticles, see the Fig. below. These results are unique for such small particle size. The new synthesis is robust, scalable, and economically favourable, involving low temperatures and well accessible chemicals.
File Format	PDF HTM / HTML
DOI	10.7892/boris.107327
Alternate Webpage(s)	http://fm17.chemistrycongresses.ch/abstracts/search-abstracts/abstract/makepdf/646
Alternate Webpage(s)	https://doi.org/10.7892/boris.107327
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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