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Depth-profiling of Yb3+ sensitizer ions in NaYF4 upconversion nanoparticles

Journal Article


Abstract


  • Enhancing the efficiency of upconversion nanoparticles (UCNPs)

    and therefore their brightness is the critical goal for this emerging

    material to meet growing demands in many potential applications

    including sensing, imaging, solar energy conversion and photonics.

    The distribution of the photon sensitizer and activator ions that

    form a network of energy transfer systems within each single

    UCNP is vital for understanding and optimizing their optical properties.

    Here we employ synchrotron-based X-ray Photoelectron

    Spectroscopy (XPS) to characterize the depth distribution of Yb3+

    sensitizer ions in host NaYF4 nanoparticles and systematically correlate

    the structure with the optical properties for a range of

    UCNPs with different sizes and doping concentrations. We find a

    radial gradient distribution of Yb3+ from the core to the surface of

    the NaYF4 nanoparticles, regardless of their size or the sensitizer’s

    concentration. Energy dispersive X-ray Spectroscopy (EDX) was

    also used to further confirm the distribution of the sensitizer ions

    in the host matrix. These results have profound implications for the

    upconversion optical property variations.

UOW Authors


  •   Xu, Xiaoxue (external author)
  •   Clarke, Christian (external author)
  •   Ma, Chenshuo (external author)
  •   Casillas, Gilberto (external author)
  •   Das, Minakshi (external author)
  •   Guan, Ming (external author)
  •   Liu, Deming (external author)
  •   Wang, Li (external author)
  •   Tadich, Anton (external author)
  •   Du, Yi
  •   Ton-That, Cuong (external author)
  •   Jin, Dayong (external author)

Publication Date


  • 2017

Citation


  • Xu, X., Clarke, C., Ma, C., Casillas, G., Das, M., Guan, M., Liu, D., Wang, L., Tadich, A., Du, Y., Ton-That, C. & Jin, D. (2017). Depth-profiling of Yb3+ sensitizer ions in NaYF4 upconversion nanoparticles. Nanoscale, 9 (23), 7719-7726.

Scopus Eid


  • 2-s2.0-85021834023

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2575

Number Of Pages


  • 7

Start Page


  • 7719

End Page


  • 7726

Volume


  • 9

Issue


  • 23

Place Of Publication


  • United Kingdom

Abstract


  • Enhancing the efficiency of upconversion nanoparticles (UCNPs)

    and therefore their brightness is the critical goal for this emerging

    material to meet growing demands in many potential applications

    including sensing, imaging, solar energy conversion and photonics.

    The distribution of the photon sensitizer and activator ions that

    form a network of energy transfer systems within each single

    UCNP is vital for understanding and optimizing their optical properties.

    Here we employ synchrotron-based X-ray Photoelectron

    Spectroscopy (XPS) to characterize the depth distribution of Yb3+

    sensitizer ions in host NaYF4 nanoparticles and systematically correlate

    the structure with the optical properties for a range of

    UCNPs with different sizes and doping concentrations. We find a

    radial gradient distribution of Yb3+ from the core to the surface of

    the NaYF4 nanoparticles, regardless of their size or the sensitizer’s

    concentration. Energy dispersive X-ray Spectroscopy (EDX) was

    also used to further confirm the distribution of the sensitizer ions

    in the host matrix. These results have profound implications for the

    upconversion optical property variations.

UOW Authors


  •   Xu, Xiaoxue (external author)
  •   Clarke, Christian (external author)
  •   Ma, Chenshuo (external author)
  •   Casillas, Gilberto (external author)
  •   Das, Minakshi (external author)
  •   Guan, Ming (external author)
  •   Liu, Deming (external author)
  •   Wang, Li (external author)
  •   Tadich, Anton (external author)
  •   Du, Yi
  •   Ton-That, Cuong (external author)
  •   Jin, Dayong (external author)

Publication Date


  • 2017

Citation


  • Xu, X., Clarke, C., Ma, C., Casillas, G., Das, M., Guan, M., Liu, D., Wang, L., Tadich, A., Du, Y., Ton-That, C. & Jin, D. (2017). Depth-profiling of Yb3+ sensitizer ions in NaYF4 upconversion nanoparticles. Nanoscale, 9 (23), 7719-7726.

Scopus Eid


  • 2-s2.0-85021834023

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2575

Number Of Pages


  • 7

Start Page


  • 7719

End Page


  • 7726

Volume


  • 9

Issue


  • 23

Place Of Publication


  • United Kingdom