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Engineering upconversion emission spectra using plasmonic nanocavities.

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|July 1, 2014

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Plasmonic nanocavities significantly enhance upconversion emission from Tm³⁺ and Yb³⁺ codoped nanoparticles. This engineering boosts UV light conversion efficiency by over 30-fold through tailored absorption and local density of states.

Area of Science:

Nanophotonics
Materials Science
Quantum Optics

Background:

Upconversion nanoparticles (UCNPs) are crucial for various photonic applications.
Controlling UCNP emission spectra and efficiency remains a key challenge.
Plasmonic nanocavities offer a promising route for light manipulation.

Purpose of the Study:

To investigate the modification of upconversion emission spectra in Tm³⁺ and Yb³⁺ codoped β-NaYF₄-NaYF₄ core-shell nanoparticles.
To explore the role of plasmonic nanocavities in enhancing UCNP performance.
To analyze the impact of nanocavity engineering on conversion efficiency and radiation patterns.

Main Methods:

Fabrication of Tm³⁺ and Yb³⁺ codoped β-NaYF₄-NaYF₄ core-shell nanoparticles.
Integration of nanoparticles within plasmonic nanocavities (cylindrical geometry exemplified).

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Spectroscopic analysis of upconversion emission and conversion efficiency.

Theoretical analysis of local density of states and plasmonic effects.

Main Results:

Judicious modification of upconversion emission spectra achieved using plasmonic nanocavities.
Demonstrated potential for over 30-fold increase in conversion efficiency to the UV spectral band.
Engineering of near-infrared (NIR) absorption and local density of states significantly impacts efficiency.
Analyzed the influence of nanocavities on radiation patterns.

Conclusions:

Plasmonic nanocavities are effective tools for enhancing UCNP performance.
Tailoring nanocavity properties offers a pathway to optimize UV emission from UCNPs.
This work provides a foundation for advanced photonic devices utilizing UCNPs.