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Upconversion luminescence properties of monodisperse spherical Y2O2S:Yb,Ho nanocrystals

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Abstract

Monodisperse spherical Y2O2S:Yb,Ho nanocrystals with particle size about 50 nm were prepared by a modified homogeneous precipitation method combined with low-temperature sulfurization process. The Y2O2S:Yb,Ho nanocrystals exhibit an intense green emission assigned to the Ho3+ ions 5F4, 5S2 → 4I15/2 transition under 980 nm infrared pump. The upconversion luminescence brightness of Y2O2S:Yb,Ho is 526 Cd/m2 under 4.63 W/cm2 pump density, indicating that the as-prepared Y2O2S:Yb,Ho nanocrystals can meet the requirement of in vivo imaging. The formation mechanism of monodisperse spherical oxysulfide nanoparticles is also discussed.

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Authors and Affiliations

  1. Physics Department, Dalian Maritime University, Dalian, Liaoning, 116026, People’s Republic of China

    Xixian Luo, Wanghe Cao & Mingming Xing

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  1. Xixian Luo
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  2. Wanghe Cao
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  3. Mingming Xing
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Correspondence to Xixian Luo.

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Luo, X., Cao, W. & Xing, M. Upconversion luminescence properties of monodisperse spherical Y2O2S:Yb,Ho nanocrystals. Journal of Materials Research 24, 1756–1760 (2009). https://doi.org/10.1557/jmr.2009.0208

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  • DOI: https://doi.org/10.1557/jmr.2009.0208

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