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Journal of Nanoparticle Research

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01-02-2015 | Research Paper

Synthesis and characterization of Na(Y,Gd)F₄ upconversion nanoparticles and an investigation of their effects on the photophysical properties of an unsubstituted tetrathiophenoxy phthalocyanine

Authors: Jessica M. Taylor, Christian Litwinski, Tebello Nyokong, Edith M. Antunes

Published in: Journal of Nanoparticle Research | Issue 2/2015

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Abstract

Sphere- and star-shaped Na(Y,Gd)F₄:Yb/Er(Tm)upconversion nanoparticles (UCNP) were successfully synthesized utilizing a methanol-assisted thermal decomposition approach and their spectroscopic (absorption, emission and luminescence lifetime) properties fully characterized. The factors affecting the size and shape of the UCNPs were studied and discussed in detail. The size of the nanoparticles was determined using TEM primarily and found to be approximately 19 and 30 nm for the Er and Tm spheres, respectively, while the Er and Tm “stars” were found to be much larger with sizes ranging from 110 to 240 nm, respectively (as determined along the width of the nanoparticle). In addition, their influence on the spectroscopic properties of an unsubstituted tetrathiophenoxy phthalocyanine (H₂Pc) was investigated. The UCNP were found to produce characteristic upconversion luminescence emissions in the blue, green, red and NIR regions. Simple mixing with an H₂Pc in toluene was found to exert no obvious changes in the spectroscopic properties of the Pc, although a considerable increase in the radiative lifetimes is observed for the Pc in the presence of the UCNPs. The singlet oxygen generation mediated by the red light excitation of the H₂Pc mixed with UCNP was found to decrease in the presence of the NPs.

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Title: Synthesis and characterization of Na(Y,Gd)F4 upconversion nanoparticles and an investigation of their effects on the photophysical properties of an unsubstituted tetrathiophenoxy phthalocyanine
Authors: Jessica M. Taylor
Christian Litwinski
Tebello Nyokong
Edith M. Antunes
Publication date: 01-02-2015
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 2/2015
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-015-2889-5

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