We report a set of femtosecond (fs) transient absorption (TA) measurements following the dynamics of the so-called nonbridging oxygen hole center in silica, a model color center in wide bandgap amorphous solids, characterized by a very large Stokes shift between the UV excitation and its associated red emission at 1.9 eV. The changes in the TA spectrum were probed in the UV-visible range at various delays after photoexcitation and analyzed as a function of the UV excitation energy, in single-photon absorption conditions. The combination of the experiments helps to clarify the defect photocycle, highlighting how TA measurements with tunable UV excitation could represent a powerful tool to investigate the dynamics of color centers embedded in transparent materials. © 2021 Optical Society of America
de Michele V., Sciortino A., Messina F., Cannas M., Boukenter A., Marin E., et al. (2021). Transient absorption with a femtosecond tunable excitation pump reveals the emission kinetics of color centers in amorphous silica. OPTICS LETTERS, 46(7), 1736-1739 [10.1364/OL.420198].
Transient absorption with a femtosecond tunable excitation pump reveals the emission kinetics of color centers in amorphous silica
Sciortino A.;Messina F.;Cannas M.;
2021-01-01
Abstract
We report a set of femtosecond (fs) transient absorption (TA) measurements following the dynamics of the so-called nonbridging oxygen hole center in silica, a model color center in wide bandgap amorphous solids, characterized by a very large Stokes shift between the UV excitation and its associated red emission at 1.9 eV. The changes in the TA spectrum were probed in the UV-visible range at various delays after photoexcitation and analyzed as a function of the UV excitation energy, in single-photon absorption conditions. The combination of the experiments helps to clarify the defect photocycle, highlighting how TA measurements with tunable UV excitation could represent a powerful tool to investigate the dynamics of color centers embedded in transparent materials. © 2021 Optical Society of America
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