Light emission from small copper particles excited by current passage or by low-energy electron bombardment

Nepijko, S. A.; Fedorovich, R. D.; Viduta, L.; Ievlev, Dmitry N.; Schulze, W.

doi:10.1016/s0921-4526(01)00257-5

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…Both of these emission characteristics indicate the EL is from single nanoclusters formed within the nanoscale break junction and is distinct from recent reports of plasmon emission from thin metal films. 22,23 The line of EL features also clearly fluoresces under mercury lamp excitation (Figure 1). While fluorescent Ag n can be photochemically produced on the oxide electrodes near the junction, the electrodes transporting current to the nanocluster junction remain continuous and, therefore, highly conductive, such that holes and electrons only recombine at the line of nanoclusters within the break junction.…”

Section: Methodsmentioning

confidence: 94%

Single-Molecule LEDs from Nanoscale Electroluminescent Junctions

and

Dickson

2003

J. Phys. Chem. B

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Through pulsed operation, polarity is introduced in single Ag nanocluster (Ag 2 -Ag 8 ) electroluminescence within seemingly nonpolar two-terminal nanoscale break junctions at room temperature. While observable with much higher power DC excitation, both high-frequency pulsed and AC operation lead to greatly increased spectrally and thermally stable electroluminescence with much narrower individual nanocluster electroluminescence spectra. Being polarity independent under both sinusoidal and DC excitations, pulsed electrical excitation of individual Ag nanoclusters has generated the first single-molecule LED by temporally separating hole and electron injection processes.

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Section: Methodsmentioning

confidence: 94%

Single-Molecule LEDs from Nanoscale Electroluminescent Junctions

and

Dickson

2003

J. Phys. Chem. B

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“…Because of the non-toxic nature and the broad size-dependent emission range from visible to near-infrared 19 , noble metal NCs demonstrate great potential for use in optoelectronic devices. Electroluminescence from metal (Au 22 , Ag 23 , and Cu 24 ) NCs with mechanically or electrically induced nanoscale junctions has been demonstrated; however, reproducibility and application of such molecular electronics for realizing nanoscale junctions remains a concern 25 . LEDs based on metal nanoclusters have been demonstrated with emission from orange to infrared 26 , 27 .…”

Section: Introductionmentioning

confidence: 99%

Non-Toxic Gold Nanoclusters for Solution-Processed White Light-Emitting Diodes

Chao

Cheng

Lin

et al. 2018

Sci Rep

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Solution-processed optoelectronic devices are attractive because of the potential low-cost fabrication and the compatibility with flexible substrate. However, the utilization of toxic elements such as lead and cadmium in current optoelectronic devices on the basis of colloidal quantum dots raises environmental concerns. Here we demonstrate that white-light-emitting diodes can be achieved by utilizing non-toxic and environment-friendly gold nanoclusters. Yellow-light-emitting gold nanoclusters were synthesized and capped with trioctylphosphine. These gold nanoclusters were then blended with the blue-light-emitting organic host materials to form the emissive layer. A current efficiency of 0.13 cd/A was achieved. The Commission Internationale de l’Eclairage chromaticity coordinates of (0.27, 0.33) were obtained from our experimental analysis, which is quite close to the ideal pure white emission coordinates (0.33, 0.33). Potential applications include innovative lighting devices and monitor backlight.

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“…The series of light emission spectra from the copper nanoparticle film (a = 7 nm) given in Fig. 16 clearly demonstrate the development of a high-energy part of the spectrum upon the increase of applied voltage (input power) from (a) to (j) [39]. Curve (a) shows the spectrum registered certainly above the noise level.…”

Section: Photon Emission From Metal Nanoparticles Excitation By Electmentioning

confidence: 87%

“…This can be concluded from the currentinduced light emission spectra for palladium [38], copper [39], silver [40,41,43], and gold [44,46] nanoparticle films showing a complex structure in contrast to the spectrum of thermal radiation with a cutoff at the wavelength l ¼ ffiffi ffi 2 p pa (emitting and adsorption of light with wavelength exceeding the diameter a of particle by a factor of ffiffi ffi 2 p p is prohibited [47]). The complex structure of the light emission spectra also indicates that the decelerating radiation (Bremsstrahlung) cannot be responsible for the observed radiation, because in this case one would observe a sharp high-energy maximum and gradual decrease toward low energies.…”

Section: à9mentioning

confidence: 96%

Emission Properties of Metal Nanoparticles

Nepijko¹,

Elmers²,

Schönhense³

2015

Handbook of Nanoparticles

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Nanoparticles emit electrons and photons when they are excited by electron injection via electric current; electromagnetic radiation via microwave fields; laser radiation in infrared, visible and synchrotron (X-ray) ranges; and electron and ion bombardment. In each case, the emission mechanism depends on characteristic length scales of the nanoparticle. If the particle size is commensurate with it or is smaller, a size dependence of emission is observed [1][2][3]. Also, it is interesting that nanoparticles may demonstrate properties absent in bulk material. Electron Emission from Metal Nanoparticles Excitation by Electron InjectionExcitation by electron injection into nanoparticles via electron tunneling (electric current flow through an ensemble of tunnel-coupled metal nanoparticles on a dielectric substrate) is accompanied by electron emission [1][2][3][4]. Electron emission is observed as soon as the conductivity deviates from an ohmic behavior. Corresponding experiments are realized "in situ", e. g., when an ensemble of gold nanoparticles is deposited onto an insulating substrate directly in the column of a transmission electron microscope [5]. The main discussion in the literature concerning the mechanism of electron emission is connected with field emission [6] and electron gas heating [7]. In the first case, it is supposed that an electric field is strongly enhanced near nanoparticles and thus sufficient for field emission because of the small radius of curvature of nanoparticles. In the second case, the electron gas heating results from an attenuation of the electron-phonon interaction in nanoparticles. If the size is much smaller than the electron mean free path, the electrons execute a periodic motion within the particle without volume scattering and are reflected specularly from the boundaries. This oscillation has the frequency o ¼ ). The larger the frequency difference for electron and phonon subsystems, the less they exchange energy with one another. Experimental studies show that the electron-phonon interaction constant observed in ten nanometer-sized gold particles is several orders of magnitude lower than in the case of bulk material [8]. The energy fed into a nanoparticle under current excitation is absorbed by its electron subsystem. If the electron-phonon interaction is sufficiently attenuated, the electron subsystem temperature increases and electrons become heated, whereas the lattice remains relatively cold. The electron emission takes place under such conditions. Electron emission provoked by electron transport has been visualized using emission electron microscopy (EEM) [9][10][11]. Figure 1a-d shows a series of EEM images of a silver nanoparticle film (caesium was used to reduce the work function). The images have been acquired at different voltages applied between the contacts U f = 0 (a), 8 (b), 10 (c), and 11 V (d). The gap with a silver nanoparticle film between the silver contacts is 5 mm. Nanoparticle emissivity considerably differs because of the spread of the particle

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Light emission from small copper particles excited by current passage or by low-energy electron bombardment

Cited by 9 publications

References 15 publications

Single-Molecule LEDs from Nanoscale Electroluminescent Junctions

Single-Molecule LEDs from Nanoscale Electroluminescent Junctions

Non-Toxic Gold Nanoclusters for Solution-Processed White Light-Emitting Diodes

Emission Properties of Metal Nanoparticles

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