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Monodisperse Silica‐Coated Polyvinylpyrrolidone/NaYF 4 Nanocrystals with Multicolor Upconversion Fluorescence Emission
Author(s) -
Li Zhengquan,
Zhang Yong
Publication year - 2006
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200602975
Subject(s) - polyvinylpyrrolidone , nanocrystal , photon upconversion , dispersity , fluorescence , materials science , doping , nanotechnology , chemical engineering , optoelectronics , optics , polymer chemistry , physics , engineering
In full color : Ultrafine lanthanide‐doped polyvinylpyrrolidone/NaYF 4 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/NaYF 4 nanocrystals doped with Yb/Er or Yb/Tm (see picture).