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Markedly enhanced up-conversion luminescence by combining IR-808 dye sensitization and core-shell-shell structures.

Jiating Xu1, Mingdi Sun1, Ye Kuang1

  • 1Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, P. R. China. yangpiaoping@hrbeu.edu.cn gaishili@hrbeu.edu.cn.

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Rare-earth-doped up-conversion nanoparticles (UCNPs) show enhanced brightness using IR-808 dye sensitization. This novel strategy improves near-infrared photon absorption and up-conversion luminescence intensity for UCNPs.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Rare-earth-doped up-conversion nanoparticles (UCNPs) convert infrared light to visible light.
  • Limited absorptivity of lanthanide ions restricts UCNP emission brightness.

Purpose of the Study:

  • To enhance the up-conversion luminescence intensity of UCNPs.
  • To investigate a novel dye sensitization strategy using IR-808.
  • To improve near-infrared photon absorption in UCNPs.

Main Methods:

  • Synthesized core-shell-shell UCNPs: NaGdF4:Yb,Er@NaGdF4:Yb@NaNdF4:Yb.
  • Utilized IR-808 dye as an antenna to sensitize UCNPs.
  • Excited the system with 808 nm light.

Main Results:

  • IR-808 emission overlapped with Nd3+ and Yb3+ absorption, enabling efficient photon capture.
  • The NaNdF4:Yb shell and NaGdF4:Yb transition layer facilitated energy transfer.
  • Dye sensitization and core-shell-shell structure significantly boosted up-conversion intensity.
  • Deleterious cross-relaxation between activators and sensitizers was eliminated.

Conclusions:

  • The novel dye-sensitized approach dramatically enhances UCNP up-conversion luminescence.
  • This strategy offers a new pathway for improving rare-earth nanoparticle luminescence.
  • Facilitates practical applications of UCNPs in various fields.