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Near-infrared quantum cutting in Tb3+, Yb3+ co-doped calcium tungstate via second-order downconversion

Published online by Cambridge University Press:  18 February 2011

Zhaofeng Wang
Affiliation:
Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People’s Republic of China
Yuhua Wang*
Affiliation:
Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People’s Republic of China
Yezhou Li*
Affiliation:
Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People’s Republic of China
Huijuan Zhang
Affiliation:
Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: wangzhf06@lzu.cn
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Abstract

Near-infrared quantum cutting involving the conversion of one visible photon into two near-infrared photons was demonstrated in Ca0.99−xYbxWO4: Tb0.01 phosphors. From the analysis of the refinement of x-ray diffraction patterns, the suitable concentration range of Yb3+ in Ca0.99WO4: 0.01Tb3+ was determined to be 0–20%. By investigating their luminescent spectra and decay lifetimes, second-order downconversion from Tb3+ to Yb3+ were proved and the possible quantum cutting mechanism was proposed. Quantum efficiency related to Yb3+ concentration was calculated and the maximum efficiency was reached at 140.4%. Because the energy of Yb3 + 2F7/22F5/2 transition matches well with the band gap of the crystalline Si, the Ca0.99−xYbxWO4: Tb0.01 phosphors could be potentially applied in silicon-based solar cells.

Type
Articles
Copyright
Copyright © Materials Research Society 2011

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References

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