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Issue 10, 2016
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Photocatalysis of NaYF4:Yb,Er/CdSe composites under 1560 nm laser excitation

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Abstract

The most common materials used to generate near-infrared-driven photocatalysis occur by 980 nm laser excitation of composites that are a combination of a semiconductor and upconverting luminescence particles. The challenge remains to increase the light harvesting efficiency, and thus, it is necessary to extend the absorption spectra of photocatalysts. In this work, NaYF4:Yb,Er/CdSe composites were prepared by depositing CdSe nanocrystals onto the surface of NaYF4:Yb,Er microcrystals. UV and visible emission of light resulted from multiphoton upconverting processes in Er3+ under 1560 nm laser irradiation, which, in turn, activated the CdSe catalyst. The energy transfer between NaYF4:Yb,Er and CdSe was investigated by steady-state and dynamic fluorescence spectroscopy. The photocatalytic performance was investigated by the degradation of methylene blue in aqueous solution. These results show that Er coupled with semiconductor heterojunctions provides a photocatalyst that operates in the extended near-infrared range.

Graphical abstract: Photocatalysis of NaYF4:Yb,Er/CdSe composites under 1560 nm laser excitation

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Publication details

The article was received on 25 Nov 2015, accepted on 09 Jan 2016 and first published on 13 Jan 2016


Article type: Paper
DOI: 10.1039/C5RA25066H
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RSC Adv., 2016,6, 8127-8133

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    Photocatalysis of NaYF4:Yb,Er/CdSe composites under 1560 nm laser excitation

    X. Guo, C. Chen, D. Zhang, C. P. Tripp, S. Yin and W. Qin, RSC Adv., 2016, 6, 8127
    DOI: 10.1039/C5RA25066H

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