6533b854fe1ef96bd12aebf1

RESEARCH PRODUCT

Luminescence features of nonbridging oxygen hole centres in silica probed by site-selective excitation with tunable laser

Marco CannasLavinia VaccaroRoberto Boscaino

subject

PhotoluminescenceChemistryPhononDangling bondGeneral ChemistryCondensed Matter PhysicsMolecular electronic transitionMolecular vibrationMaterials ChemistryAtomic physicsLuminescenceInsulator Point defects luminescence time-resolved spectroscopiesExcitationTunable laser

description

Time-resolved photoluminescence at 1.9 eV associated with the nonbridging oxygen hole centre (NBOHC) in silica was investigated under excitation with a ns pulsed laser system, tunable in the visible range. Mapping of the excitation/emission pattern evidences the site-selective excitation of the resonant zero phonon line (ZPL) transition due to its weak coupling with the stretching mode of dangling oxygen. Decay of ZPL follows an exponential law with lifetime of 15.3 μs, which provides a precise measure of the electronic transition probability of a single NBOHC.

yearjournalcountryeditionlanguage
2008-04-01
10.1016/j.ssc.2008.02.001http://hdl.handle.net/10447/38890