Nanophotonics for current and future white light-emitting devices

Galisteo‐López, Juan F.; Lozano, Gabriel

doi:10.1063/5.0065825

Cited by 8 publications

(8 citation statements)

References 108 publications

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“…Among the different photonic strategies employed to enhance the emission of nanomaterials, , metallic nanostructures that support localized surface plasmon resonances (LSPRs) have demonstrated great potential. , LSPRs originate from the collective oscillations of free electrons located on the surface of the metal when it is illuminated . Metallic nanoparticles feature large scattering cross sections and may provide resonant photoexcitation and/or enhanced radiative decay for emitters whose position spatially overlaps with the field profile of the LSPR at a frequency that spectrally matches the excitation or emission band of the emitter, respectively .…”

Section: Introductionmentioning

confidence: 99%

“…Among the different photonic strategies employed to enhance the emission of nanomaterials, 25 , 26 metallic nanostructures that support localized surface plasmon resonances (LSPRs) have demonstrated great potential. 27 , 28 LSPRs originate from the collective oscillations of free electrons located on the surface of the metal when it is illuminated.…”

Section: Introductionmentioning

confidence: 99%

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Nanoantennas Patterned by Colloidal Lithography for Enhanced Nanophosphor Light Emission

Viaña

Romero

Lozano

et al. 2022

ACS Appl. Nano Mater.

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Transparent coatings made of rare-earth doped nanocrystals, also known as nanophosphors, feature efficient photoluminescence and excellent thermal and optical stability. Herein, we demonstrate that the optical antennas prepared by colloidal lithography render thin nanophosphor films with a brighter emission. In particular, we fabricate gold nanostructures in the proximity of GdVO 4 :Eu 3+ nanophosphors by metal evaporation using a mask made of a monolayer of polymer beads arranged in a triangular lattice. Optical modes supported by the antennas can be controlled by tuning the diameter of the polymer spheres in the colloidal mask, which determines the shape of the gold nanostructure, as confirmed by numerical simulations. Confocal microscopy reveals that metallic antennas induce brighter photoluminescence at specific spatial regions of the nanophosphor film at targeted frequencies as a result of the coupling between gold nanostructures and nanophosphors. Patterning of nanophosphor thin layers with arrays of metallic antennas offers an inexpensive nanophotonic solution to develop bright emitting coatings of interest for color conversion, labeling, or anticounterfeiting.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoantennas Patterned by Colloidal Lithography for Enhanced Nanophosphor Light Emission

Viaña

Romero

Lozano

et al. 2022

ACS Appl. Nano Mater.

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“…The number of available optical modes defines how efficiently the dipole can emit radiation. − The presence of resonant structures changes the photonic environment and the LDOS, altering how light sources decay. − The spatially dependent LDOS can be engineered by altering the surrounding of the dipole with resonant structures, increasing or decreasing the number of available modes. The LDOS is, therefore, an important quantity for fundamental processes, such as energy transfer, light–matter interaction, or single-photon emission, and for applications, such as solid-state lighting, solar cells, lasers, and optical sensors. − The LDOS is not only important in the field of photonics but also has implications for any wave phenomena, such as sound waves or in nuclear physics. , …”

Section: Introductionmentioning

confidence: 99%

Direct Measurement of the Local Density of Optical States in the Time Domain

et al. 2023

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One of the most fundamental and relevant properties of a photonic system is the local density of optical states (LDOS) as it defines the rate at which an excited emitter dissipates energy by coupling to its surrounding. However, the direct determination of the LDOS is challenging as it requires measurements of the complex electric field of a point dipole at its own position. We introduce here a near-field setup which can measure the terahertz electric field amplitude at the position of a point source in the time domain. From the measured amplitude, the frequency-dependent imaginary component of the electric field can be determined and the LDOS can be retrieved. As a proof of concept, this setup has been used to measure the partial LDOS (the LDOS for a defined dipole orientation) as a function of the distance to planar interfaces made of gold, InSb, and quartz. Furthermore, the spatially dependent partial LDOS of a resonant gold rod has been measured as well. These results have been compared with analytical results and simulations. The excellent agreement between measurements and theory demonstrates the applicability of this setup for the quantitative determination of the LDOS in complex photonic systems.

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“…Nano-dots are localised nanometre-scale structures, whereas quantum dots are nanoparticles made from semiconductor materials, all exhibiting localised magnetic or electrical fields at very small scales. These localised properties can be exploited, particularly for use in light-emitting devices [ 1 , 2 , 3 ], information storage [ 4 , 5 , 6 ] and energy storage [ 7 , 8 , 9 ]. Nano-dots can be thought of as small magnets which can switch polarity and this change is exploited exclusively in new hard drives [ 10 ], solar cells [ 11 , 12 ], super capacitors [ 13 ] and batteries [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

A DFT Study of Ruthenium fcc Nano-Dots: Size-Dependent Induced Magnetic Moments

Ungerer

Leeuw

2023

Nanomaterials

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Many areas of electronics, engineering and manufacturing rely on ferromagnetic materials, including iron, nickel and cobalt. Very few other materials have an innate magnetic moment rather than induced magnetic properties, which are more common. However, in a previous study of ruthenium nanoparticles, the smallest nano-dots showed significant magnetic moments. Furthermore, ruthenium nanoparticles with a face-centred cubic (fcc) packing structure exhibit high catalytic activity towards several reactions and such catalysts are of special interest for the electrocatalytic production of hydrogen. Previous calculations have shown that the energy per atom resembles that of the bulk energy per atom when the surface-to-bulk ratio < 1, but in its smallest form, nano-dots exhibit a range of other properties. Therefore, in this study, we have carried out calculations based on the density functional theory (DFT) with long-range dispersion corrections DFT-D3 and DFT-D3-(BJ) to systematically investigate the magnetic moments of two different morphologies and various sizes of Ru nano-dots in the fcc phase. To confirm the results obtained by the plane-wave DFT methodologies, additional atom-centred DFT calculations were carried out on the smallest nano-dots to establish accurate spin-splitting energetics. Surprisingly, we found that in most cases, the high spin electronic structures had the most favourable energies and were hence the most stable.

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Nanophotonics for current and future white light-emitting devices

Cited by 8 publications

References 108 publications

Nanoantennas Patterned by Colloidal Lithography for Enhanced Nanophosphor Light Emission

Nanoantennas Patterned by Colloidal Lithography for Enhanced Nanophosphor Light Emission

Direct Measurement of the Local Density of Optical States in the Time Domain

A DFT Study of Ruthenium fcc Nano-Dots: Size-Dependent Induced Magnetic Moments

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