2002/03/13 by Marco Cannas, M. Cannas, Cannas, Marco
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Glass properties and applications #Luminescence Properties of Advanced Materials #Materials Science (cond-mat.mtrl-sci) #Photonic Crystals and Applications #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/0203284
20 pages, to be published in IOS Press
arxiv created 2002/03/13 · openalex publication_date 2002/03/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The optical properties of point defects in as-grown natural silica are reviewed. Two emissions peaked at 4.2 eV (αE band) and at 3.1 eV (β band), related to an absorption band at 5.1 eV (B2β), have been experimentally investigated on the basis of their temperature dependence and their kinetic decay. Our results allow to characterize the excitation pathway of these luminescence bands and to make clear the competition between the radiative relaxation rates and the phonon assisted intersystem crossing process linking the singlet and the triplet excited states from which αE and β, respectively, originate. Finally, we discuss the role played by the disordered vitreous matrix in influencing the optical features of defects.