6533b7d1fe1ef96bd125cf5f
RESEARCH PRODUCT
Vibronic structures in the visible luminescence of silica nanoparticles
Marco CannasSimonpietro AgnelloLuisa SciortinoFranco Mario GelardiL. SpallinoRoberto BoscainoLavinia Vaccarosubject
AtmosphereSilica nanoparticlesRange (particle radiation)PhotoluminescencechemistrySilica nanoparticles defects phonon-coupling photoluminescencechemistry.chemical_elementNanoparticleAtomic physicsLuminescenceNitrogenBlue banddescription
Time resolved photoluminescence investigation in air and in vacuum atmosphere of the visible luminescence related to silica surface defects is here reported. Two contributions can be singled out: one, observed both in air and in vacuum, is the well-known blue band, peaked around 2.8 eV decaying in ∼5 ns; the other, only observed in vacuum, is a structured emission in the violet range characterized by two vibronic progressions spaced 1370 cm−1 and 360 cm−1 decaying in ∼100 ns. In contrast with previous attribution, the well distinguishable spectroscopic properties together with the observation of the effects induced by the interaction with nitrogen allow to state that the emission bands originate by two different defects.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 | AIP Conference Proceedings |