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Nanoantennas Patterned by Colloidal Lithography for Enhanced Nanophosphor Light Emission
Jose M Viaña1, Manuel Romero1, Gabriel Lozano1
1Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, C. Américo Vespucio 49, Sevilla41092, Spain.
ACS Applied Nano Materials
|December 5, 2022
Summary
We enhanced the brightness of rare-earth doped nanocrystals (nanophosphors) using gold nanostructures. This nanophotonic approach improves coatings for applications like color conversion and anti-counterfeiting.
Area of Science:
- Nanophotonics
- Materials Science
Background:
- Rare-earth doped nanocrystals (nanophosphors) offer efficient photoluminescence and stability.
- Transparent coatings utilizing nanophosphors are valuable for various applications.
Purpose of the Study:
- To enhance the emission intensity of nanophosphor films.
- To develop an inexpensive nanophotonic solution for brighter coatings.
Main Methods:
- Fabrication of gold nanostructures near GdVO4:Eu3+ nanophosphors using colloidal lithography and metal evaporation.
- Control over nanostructure shape by tuning polymer sphere diameter in the colloidal mask.
- Numerical simulations to confirm optical mode control.
Main Results:
- Optical antennas significantly increased photoluminescence brightness in specific regions of nanophosphor films.
- Coupling between gold nanostructures and nanophosphors was confirmed.
- Tunable optical modes were achieved by controlling antenna geometry.
Conclusions:
- Patterning nanophosphor films with metallic antennas is an effective strategy to boost emission.
- This method provides an inexpensive route to bright emitting coatings.
- Potential applications include color conversion, labeling, and anti-counterfeiting.
