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Green Synthesis of Y2O3:Eu3+ Nanocrystals for Bioimaging

Published online by Cambridge University Press:  18 March 2015

Adrine Malek Khachatourian
Affiliation:
Department of Materials and Nano Physics, KTH-Royal Institute of Technology, SE 16440 Kista-Stockholm, Sweden. School of Metallurgy and Materials Engineering, IUST-Iran University of Science and Technology, 16846 Tehran, Iran.
Farhad Golestani-Fard
Affiliation:
School of Metallurgy and Materials Engineering, IUST-Iran University of Science and Technology, 16846 Tehran, Iran.
Hossein Sarpoolaky
Affiliation:
School of Metallurgy and Materials Engineering, IUST-Iran University of Science and Technology, 16846 Tehran, Iran.
Carmen Vogt
Affiliation:
Department of Biomedical and X-ray Physics, KTH-Royal Institute of Technology, 10044 Stockholm, Sweden.
Yichen Zhao
Affiliation:
Department of Materials and Nano Physics, KTH-Royal Institute of Technology, SE 16440 Kista-Stockholm, Sweden.
Muhammet S. Toprak
Affiliation:
Department of Materials and Nano Physics, KTH-Royal Institute of Technology, SE 16440 Kista-Stockholm, Sweden.
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Abstract

Rare earth (e.g., Eu, Er, Yb, Tm) doped Y2O3 nanocrystals are promising fluorescent bioimaging agents which can overcome well known problems of currently used organic dyes like photobleaching, phototoxicity, and light scattering. Furthermore, the alternative quantum dots (QDs) composed of heavy metals (e.g., CdSe) possess inherently low biocompatibility due to the heavy metal content. In the present work, monodisperse spherical Y2O3:Eu3+ nanocrystals were successfully synthesized by microwave assisted urea precipitation method followed by thermochemical treatment. This is a green, fast and reproducible synthesis method, which is surfactant and hazardous precursors free. The as prepared particles were non-aggregated, spherical particles with a narrow size distribution. The calcined particles have a polycrystalline structure preserving the monodispersity and the spherical morphology of the as prepared particles. After calcination of Y(OH)CO3:Eu3+ precursors at 900°C for 2 hours, a highly crystalline cubic Y2O3 structure was obtained. The Y2O3:Eu3+ spherical particles showed a strong red emission peak at 613nm due to the 5D07F2 forced electric dipole transition of Eu3+ ions under UV excitation (235 nm) as revealed by the photoluminescence analysis (PL). The effect of reaction time on size and photoluminescence properties of calcined particles and also the effect of reaction temperature and pressure on the size and the yield of the precipitation process have been studied. The intense red fluorescent emission, excellent stability and potential low toxicity make these QDs promising for applications in bio-related areas such as fluorescence cell imaging or fluorescence bio labels.

Type
Articles
Copyright
Copyright © Materials Research Society 2015 

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