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Effective Wavelength Conversion from Near-UV to Red for Photovoltaics: Potential of Transparent YVO4:Bi3+,Eu3+ Nanophosphor Film

Published online by Cambridge University Press:  01 February 2011

Satoru Takeshita
Affiliation:
bamboo@q02.itscom.net, Keio University, Department of Applied Chemistry, Yokohama, Japan
Kenji Nakayama
Affiliation:
n_kenji08@yahoo.co.jp, Keio University, Department of Applied Chemistry, Yokohama, Japan
Tetsuhiko Isobe
Affiliation:
isobe@applc.keio.ac.jp, Keio University, Department of Applied Chemistry, Yokohama, Japan
Tomohiro Sawayama
Affiliation:
SAWAYAMA-TOMO@star.dnt.co.jp, SINLOIHI Company, Limited, Kamakura, Japan
Seiji Niikura
Affiliation:
NIIKURA@star.dnt.co.jp, SINLOIHI Company, Limited, Kamakura, Japan
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Abstract

The authors prepared a near-UV to red wavelength conversion thick film containing 38.8 wt% of YVO4:Bi3+,Eu3+ nanoparticles of 10.8 ± 1.6 nm in size. This nanoparticle film shows a high transparency in the visible region, e.g., the transmittance at 619 nm is ∼ 96% irrespective of the film thickness. The photoluminescence intensity at 619 nm corresponding to the f-f transition of Eu3+ for this nanoparticle film increases with increasing the film thickness up to 400 μm, whereas that of the film containing micron-sized particles reaches the maximum at the film thickness of ∼ 40 μm. On the other hand, YVO4:Bi3+,Eu3+ nanoparticles have a sufficient photostability for practical use over 15 years outside, as confirmed by the light fastness test. These results suggest that the transparent film of YVO4:Bi3+,Eu3+ nanoparticles are potentially applicable to the spectral convertor for photovoltaic cells from the aspects of low light-scattering loss and high photostability.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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