Search results for " time resolved luminescence"

showing 4 items of 4 documents

Time-resolved luminescence of non-bridging oxygen hole centre in silica: Bulk and surface properties

2007

Disordered structures time resolved luminescence amorphous materials laser spectroscopy
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Time Resolved Photoluminescence Associated with Non Bridging Oxygen Hole Centers in Irradiated Silica

2007

Silica irradiation time resolved luminescence non bridging oxygen hole center
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Bright Visible Luminescence in Silica Nanoparticles

2011

International audience; We demonstrate that a porous film of silica nanoparticles emits a bright visible luminescence associated with defects stabilized by oxygen chemisorption at oxygen deficient center sites. Time-resolved spectra excited by a tunable laser allow us to distinguish the luminescence at 1.99 eV, characteristic of the nonbridging oxygen hole center (NBOHC) (Si-O)3 Si-O*, and a fast and a slow emission: the first (lifetime τ ≈ 25 ns) is peaked at 2.27 eV with an excitation spectrum centered at 5.5 eV; the second (τ ≈ 7.5 μs) is peaked at 2.41 eV and is excited around 3.2 and 5.2 eV. Reaction in an air atmosphere leads to the disappearance of the NBOHC luminescence and of the …

nanoparticles silica time resolved luminescence[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]Materials scienceSilanoneNanoparticleSpectral lineSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsGeneral EnergyChemisorptionExcited statePhysical and Theoretical ChemistryAtomic physicsLuminescenceExcitationTunable laserThe Journal of Physical Chemistry C
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Luminescenza risolta in tempo del non bridging oxygen hole center in silice: proprietà di volume e di superficie

2007

silica non bridging oxygen hole center time resolved luminescence
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