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Direct observation of the core/double-shell architecture of intense dual-mode luminescent tetragonal bipyramidal nanophosphors

Nanoscale, ISSN: 2040-3372, Vol: 8, Issue: 19, Page: 10049-10058
2016
  • 29
    Citations
  • 0
    Usage
  • 32
    Captures
  • 2
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    29
    • Citation Indexes
      29
  • Captures
    32
  • Mentions
    2
    • News Mentions
      2
      • News
        2

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Direct observation of the core/double-shell architecture of intense dual-mode luminescent tetragonal bipyramidal nanophosphors

(Before It's News) Where size matters Nanoscale , 2016, Advance Article DOI : 10.1039/C5NR05722A, Paper Open Access Su Yeon Kim, Jong Seok Jeong, K. Andre

Article Description

Highly efficient downconversion (DC) green-emitting LiYF:Ce,Tb nanophosphors have been synthesized for bright dual-mode upconversion (UC) and DC green-emitting core/double-shell (C/D-S) nanophosphors-Li(Gd,Y)F:Yb(18%),Er(2%)/LiYF:Ce(15%),Tb(15%)/LiYF-And the C/D-S structure has been proved by extensive scanning transmission electron microscopy (STEM) analysis. Colloidal LiYF:Ce,Tb nanophosphors with a tetragonal bipyramidal shape are synthesized for the first time and they show intense DC green light via energy transfer from Ce to Tb under illumination with ultraviolet (UV) light. The LiYF:Ce,Tb nanophosphors show 65 times higher photoluminescence intensity than LiYF:Tb nanophosphors under illumination with UV light and the LiYF:Ce,Tb is adapted into a luminescent shell of the tetragonal bipyramidal C/D-S nanophosphors. The formation of the DC shell on the core significantly enhances UC luminescence from the UC core under irradiation of near infrared light and concurrently generates DC luminescence from the core/shell nanophosphors under UV light. Coating with an inert inorganic shell further enhances the UC-DC dual-mode luminescence by suppressing the surface quenching effect. The C/D-S nanophosphors show 3.8% UC quantum efficiency (QE) at 239 W cm and 73.0 ± 0.1% DC QE. The designed C/D-S architecture in tetragonal bipyramidal nanophosphors is rigorously verified by an energy dispersive X-ray spectroscopy (EDX) analysis, with the assistance of line profile simulation, using an aberration-corrected scanning transmission electron microscope equipped with a high-efficiency EDX. The feasibility of these C/D-S nanophosphors for transparent display devices is also considered.

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