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RESEARCH PRODUCT
Photoluminescence activity in natural silica excited in the vacuum-UV range
S. VariscoA. ColluraFranco Mario GelardiRoberto BoscainoMarco CannasMarco Barberasubject
PhotoluminescenceAbsorption spectroscopyChemistryCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsAbsorption bandExcited stateMaterials ChemistryCeramics and CompositesAtomic physicsLuminescenceGround stateAbsorption (electromagnetic radiation)Excitationdescription
Abstract We report an experimental study on the optical absorption and photoluminescence detected in samples of natural silica. Our results show that the two emission bands, β (∼3.1 eV) and α E (∼4.3 eV), have an excitation profile in the vacuum ultraviolet region with a maximum at ∼7.5 eV. This excitation profile indicates that, in terms of energy levels of the luminescent defect, there is a transition from a ground state, S 0 , to a second excited state, S 2 , able to excite PL emission, in addition to the well known transition corresponding to the optical absorption band, B 2β . Our data are in a quantitative agreement with `ab initio' calculations carried out for a two-fold coordinated Ge defect in SiO 2 and exclude a correlation between the S 0 → S 2 transition and the 7.6 eV E band.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-04-01 | Journal of Non-Crystalline Solids |