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

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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 + 2F7/2 → 2F5/2 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.

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Acknowledgment

The authors thank the National Natural Science Foundation of China (10874061), the Research Fund for the Doctoral Program of Higher Education (200807300010), and the National Science Foundation for Distinguished Young Scholars (50925206).

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Authors and Affiliations

  1. Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Zhaofeng Wang, Yuhua Wang, Yezhou Li & Huijuan Zhang

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  1. Zhaofeng Wang
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  2. Yuhua Wang
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Correspondence to Yuhua Wang.

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Wang, Z., Wang, Y., Li, Y. et al. Near-infrared quantum cutting in Tb3+, Yb3+ co-doped calcium tungstate via second-order downconversion. Journal of Materials Research 26, 693–696 (2011). https://doi.org/10.1557/jmr.2011.6

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  • DOI: https://doi.org/10.1557/jmr.2011.6

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