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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Photocatalytic Properties of Nanocrystalline TiO2 coupled with Up-Conversion Phosphors

S. Mavengere, H. M. Yadav, J.-S. Kim

Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Republic of Korea

received October 28, 2016, received in revised form December 9, 2016, accepted January 10, 2017

Vol. 8, No. 1, Pages 67-72   DOI: 10.4416/JCST2016-00089

Abstract

NaYF4:(Yb3+, Er3+) up-conversion phosphor was synthesized with the combustion method and coated with TiO2 nanoparticles by means of a sol-gel technique. Emission peaks of the up-conversion phosphor were located at 523, 544 and 655 nm under irradiation with a 980 nm infrared (IR) dot laser light with 40 mW. TiO2-coated NaYF4:(Yb3+, Er3+) phosphor showed similar emission peaks with reduced intensities. The photocatalytic activity of the TiO2-coated up-conversion phosphor particles was investigated based on the degradation of aqueous methylene blue (MB) solution under irradiation with a 200-W visible light of wavelength λ > 410 nm. TiO2-coated NaYF4:(Yb3+, Er3+) phosphor particles showed enhanced photocatalytic activity compared with pure TiO2 powders. The mechanism for enhanced photocatalytic activity was explained in relation to the energy band structure that exists at the interlayer between the NaYF4:(Yb3+, Er3+) phosphor and TiO2 nanoparticles.

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Keywords

Up-conversion phosphor, NaYF4:(Yb3+, Er3+), TiO2,photocatalysis, visible-light photo-reaction

References

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