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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Light upconverting core-shell nanostructures: nanophotonic control for emerging applications.

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Hierarchical core-shell nanostructures with lanthanide ions enable efficient light upconversion. This technology offers tunable properties for biomedical, energy, and security applications by controlling nanostructure design.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Photonics

Background:

  • Lanthanide-ion-based upconverting nanostructures are crucial for various applications.
  • Core-shell designs offer precise control over electronic energy states and emission properties.
  • Hierarchical architectures enhance upconversion efficiency by suppressing quenching mechanisms.

Purpose of the Study:

  • To review the nanophotonic control of light upconverting nanoparticles.
  • To highlight the role of hierarchical shells in core-shell nanostructures.
  • To discuss emerging applications in biomedicine, solar energy, and security.

Main Methods:

  • Controlled synthesis of core-shell nanostructures with hierarchical shells.
  • Engineering of electronic and physiochemical properties through shell design.
  • Investigation of energy transfer and upconverted emission mechanisms.

Main Results:

  • Hierarchical shells enable fine-tuning of electronic structures and surface coupling.
  • Suppression of quenching mechanisms leads to highly efficient upconversion.
  • Demonstrated potential for integrating multiple functionalities (imaging, therapy, energy conversion).

Conclusions:

  • Hierarchical core-shell nanostructures provide a powerful platform for advanced photonic applications.
  • Nanophotonic control through shell design is key to optimizing upconversion efficiency.
  • These nanomaterials show significant promise across diverse fields including healthcare, energy, and security.