Journal
RSC ADVANCES
Volume 6, Issue 10, Pages 8127-8133Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra25066h
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Funding
- China Scholarship Council
- National Natural Science Foundation of China [NSFC 11274139, 61275189, 51302103, 11474132, 11404136]
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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.
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