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Efficient up-conversion red emission from TiO2:Yb,Er nanocrystals.

Yangqing Wu, Shaobing Lin, Jingjing Liu

    Optics Express
    |October 19, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Researchers achieved dominant red emission from titanium dioxide (TiO2) nanocrystals using ytterbium (Yb) and erbium (Er) doping. This controlled up-conversion (UC) red light emission is promising for biological applications.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Photonics

    Background:

    • Up-conversion (UC) emission typically favors green light in rare-earth doped fluoride nanocrystals.
    • Specific applications, particularly in the biological field, require preferential red emission.

    Purpose of the Study:

    • To achieve dominant UC red emission from rare-earth doped titanium dioxide (TiO2) nanocrystals.
    • To investigate methods for enhancing UC red emission through control of material properties.

    Main Methods:

    • Preparation of TiO2 nanocrystals doped with ytterbium (Yb) and erbium (Er).
    • Tuning crystal symmetry and size by controlling annealing temperature and Yb3+ ion concentration.
    • Excitation using a 980 nm light source.

    Main Results:

    • Demonstrated dominant UC red emission from TiO2:Yb,Er nanocrystals.
    • Enhanced UC red emission achieved by optimizing annealing temperature and Yb3+ concentration.
    • Identified multi-photon relaxation and cross-relaxation as potential mechanisms.

    Conclusions:

    • Dominant UC red emission is achievable in TiO2:Yb,Er nanocrystals.
    • Material properties like crystal symmetry and size significantly influence UC red emission intensity.
    • The findings offer potential for novel applications in biological imaging and sensing.