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Title: Highly efficient green up-conversion emission from fluoroindate glass nanoparticles functionalized with a biocompatible polymer
Authors: Jimenez, G. Lesly
Shrestha, Binita
Porter, Tyron
Starzyk, Bartłomiej
Lesniak, Magdalena
Kuwik, Marta
Kochanowicz, Marcin
Szumera, Magdalena
Lisiecki, R.
Dorosz, D.
Keywords: Up-conversion nanoparticles; fluoroindate glass; nanoparticles functionalized; biocompatible polymer
Issue Date: 2022
Citation: RSC Advances, Vol. 12, iss. 31 (2022) s. 20074-20079
Abstract: Up-conversion nanoparticles have garnered lots of attention due to their ability to transform low energy light (near-infrared) into high-energy (visible) light, enabling their potential use as remote visible light nano-transducers. However, their low efficiency restricts their full potential. To overcome this disadvantage, fluoroindate glasses (InF3) doped at different molar concentrations of Yb3+ and Er3+ were obtained using the melting–quenching technique, reaching the highest green emission at 1.4Yb and 1.75Er (mol%), which corresponds to the 4S3/2 / 4I15/2 (540–552 nm) transition. The particles possess the amorphous nature of the glass and have a high thermostability, as corroborated by thermogravimetric assay. Furthermore, the spectral decay curve analysis showed efficient energy transfer as the rare-earth ions varied. This was corroborated with the absolute quantum yield (QY) obtained (85%) upon excitation at 385 nm with QYEr ¼ 17% and QYYb ¼ 68%. Additionally, InF3–1.4Yb–1.75Er was milled and functionalized using poly(ethylene glycol) to impart biocompatibility, which is essential for biomedical applications. Such functionalization was verified using FTIR, TG/DSC, and XRD.
DOI: 10.1039/d2ra03171j
ISSN: 2046-2069
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