6533b85afe1ef96bd12b8c28

RESEARCH PRODUCT

Wide range excitation of visible luminescence in nanosilica

Lavinia VaccaroG. VaccaroSimonpietro AgnelloGianpiero BuscarinoMarco Cannas

subject

Materials Chemistry2506 Metals and AlloysRange (particle radiation)PhotoluminescenceMaterials scienceoptical down conversionChemistry (all)General ChemistrynanosilicaCondensed Matter PhysicCondensed Matter PhysicsA. NanostructureD. Optical propertieFull width at half maximumC. Point defectExcited stateMaterials ChemistryluminescenceSpontaneous emissionEmission spectrumAtomic physicsTime-resolved spectroscopyE. LuminescenceLuminescence

description

The visible luminescence of nanometer-sized silica particles (7 nm mean diameter) was investigated using time resolved spectroscopy. This luminescence is characterized by a wide excitation in the visible and ultraviolet range. The emission spectrum is centred at 2.72 eV with a full width at half maximum of 0.70 eV when excited above 3.5 eV, whereas it progressively empties on the high energy side when excited below 3.5 eV. Moreover, the lifetime falls in the ns timescale and decreases on increasing the emission energy. These features are due to the exceptionally broad inhomogeneous distribution of the emitting centres peculiar to the silica nanoparticles. © 2010 Elsevier B.V. All rights reserved.

yearjournalcountryeditionlanguage
2010-12-01
10.1016/j.ssc.2010.09.025http://hdl.handle.net/10281/123875