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Monodisperse Silica-Coated Polyvinylpyrrolidone/NaYF4 Nanocrystals with Multicolor Upconversion Fluorescence Emission

Authors

  • Zhengquan Li Dr.,

    1. Singapore–MIT Alliance, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
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  • Yong Zhang Prof.

    1. Division of Bioengineering, Faculty of Engineering, Blk, EA-03-12, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore, Fax: (+65) 6872-3069
    2. Nanoscience and Nanotechnology Initiative, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore
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  • The authors thank the Singapore–Massachusetts Institute of Technology Alliance (SMA) for a postdoctoral fellowship for Z.L. and the National University of Singapore for research funding.

Abstract

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In full color: Ultrafine lanthanide-doped polyvinylpyrrolidone/NaYF4 nanocrystals with narrow size distribution were synthesized and found to disperse well in water and many organic solvents. Silica was coated onto the nanocrystals to form a uniform thin layer. Highly efficient upconversion fluorescence was observed from both uncoated and silica-coated PVP/NaYF4 nanocrystals doped with Yb/Er or Yb/Tm (see picture).

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