0000000000771009

AUTHOR

Roberto Lorenzi

0000-0002-6199-0971

showing 1 related works from this author

Luminescence mechanisms of defective ZnO nanoparticles.

2016

ZnO nanoparticles (NPs) synthesized by pulsed laser ablation (PLAL) of a zinc plate in deionized water were investigated by time-resolved photoluminescence (PL) and complementary techniques (TEM, AFM, μRaman). HRTEM images show that PLAL produces crystalline ZnO NPs in wurtzite structure with a slightly distorted lattice parameter a. Consistently, optical spectra show the typical absorption edge of wurtzite ZnO (Eg = 3.38 eV) and the related excitonic PL peaked at 3.32 eV with a subnanosecond lifetime. ZnO NPs display a further PL peaking at 2.2 eV related to defects, which shows a power law decay kinetics. Thermal annealing in O2 and in a He atmosphere produces a reduction of the A1(LO) Ra…

Materials sciencePhotoluminescenceGeneral Physics and AstronomyNanotechnology02 engineering and technologyElectrontime resolved photoluminescence010402 general chemistry01 natural sciencessymbols.namesakeLattice constantPhysical and Theoretical ChemistryHigh-resolution transmission electron microscopyRamanFIS/03 - FISICA DELLA MATERIAWurtzite crystal structurebusiness.industrySettore FIS/01 - Fisica Sperimentale021001 nanoscience & nanotechnology0104 chemical sciencesAbsorption edgeZnO nanoparticles laser ablation Luminescence microscopy excitons defectssymbolsTEMZnOOptoelectronicsoxide nanoparticle0210 nano-technologybusinessRaman spectroscopyLuminescencePhysical chemistry chemical physics : PCCP
researchProduct