Search results for " pulsed laser ablation"

showing 3 items of 3 documents

Synthesis of multi-color luminescent ZnO nanoparticles by ultra-short pulsed laser ablation

2020

Abstract Crystalline ZnO nanoparticles (NPs) are synthesized by ultra-short femtosecond (fs) pulsed laser ablation (PLA) of a zinc plate in deionized water, and are investigated by optical absorption and time resolved luminescence spectra in combination with the morphology and structure analysis. The comparison with previous experiments based on short nanosecond (ns) PLA highlights that pulse duration is a crucial parameter to determine the size and the optical properties of ZnO NPs. While short PLA generates NPs with average size S ‾ of ~ 30 nm, ultrashort PLA allows to achieve much smaller NPs, S ‾ ⩽ 10  nm, that evidence weak quantum confinement effects on both the absorption edge and th…

Materials sciencePhotoluminescenceUltrashort pulsed laser ablationZnO nanoparticlesExcitonGeneral Physics and Astronomy02 engineering and technology010402 general chemistry01 natural sciencesAtomic force microscopyAbsorption (electromagnetic radiation)Time resolved luminescencebusiness.industryQuantum confinement effectsSurfaces and InterfacesGeneral ChemistryNanosecond021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesSurfaces Coatings and FilmsAbsorption edgeQuantum dotFemtosecondOptoelectronics0210 nano-technologyLuminescencebusinessTransmission electron microscopyApplied Surface Science
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Effects of the process conditions on the plume of a laser-irradiated indium–tin-oxide target

2001

Abstract The plume of a laser-ablated indium–tin-oxide target was investigated by optical emission spectroscopy. Atomic and ionic species of indium, tin and oxygen were observed; moreover, molecular bands of indium oxide were identified in the fluorescent spectra. The effects of the oxygen as a background gas and of the laser fluence on the behaviour of the ejected particles were studied with respect to the intensity of the emission and the delay time as a function of the observation distance from the target surface. The non-linear behaviour of the fluorescent species with the process conditions could infer spatial variations of the plume composition. The analysis demonstrates a plume expan…

Materials sciencebusiness.industryOxideOptical emission spectroscopy Indium–tin-oxide Pulsed laser ablation Plasma diagnostics Time of flightchemistry.chemical_elementLaserSettore ING-INF/01 - ElettronicaFluencehumanitiesAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materialslaw.inventionPlumeIndium tin oxidechemistry.chemical_compoundOpticschemistrylawEmission spectrumElectrical and Electronic EngineeringPhysical and Theoretical ChemistryTinbusinessIndiumOptics Communications
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Luminescence Efficiency of Si/SiO 2 Nanoparticles Produced by Laser Ablation

2019

Photoluminescence properties of Si(core)/SiO 2 (shell) nanoparticles produced by pulsed laser ablation in aqueous solution are investigated with the purpose to highlight the microscopic processes that govern the emission brightness and stability. Time resolved spectra evidence that these systems emit a µs decaying band centered around 1.95 eV, that is associated with the radiative recombination of quantum-confined excitons generated in the Si nanocrystalline core. Both the quantum efficiency and the stability of this emission are strongly dependent on the pH level of the solution, that is changed after the laser ablation is performed. They enhance in acid environment because of the H + pass…

PhotoluminescenceLaser ablationMaterials scienceSi/SiO2 nanoparticles pulsed laser ablation quantum confinement luminescence IR absorption pH dependencebusiness.industry2Surfaces and InterfacesCondensed Matter Physicslaser ablation; pH dependence; photoluminescence; quantum confinement; Si/SiO ; 2; nanoparticlesquantum confinementSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsQuantum dotSio2 nanoparticleslaser ablationMaterials ChemistryPh dependenceOptoelectronicsphotoluminescencenanoparticlespH dependenceElectrical and Electronic EngineeringLuminescencebusinessSi/SiOphysica status solidi (a)
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