title: Time resolved ultraviolet photoluminescence of mesoporous silica.
abstract: We studied the optical properties of sol-gel synthesized porous silica excited by synchrotron radiation in the 4-10 eV range. The spectral and temporal characteristics of the ultraviolet photoluminescence at about 3.7 eV are reported. The UV emission results from the contribution of two different centers: the first one centered at 3.7 eV with a decay time of 2.0 ns and the second one peaked at 3.9 eV with a decay time of 20 ns. We propose to assign the observed luminescence to different interacting surface silanols.
authors.affiliation: Dipartimento di Fisica, Università di Cagliari and INFM UdR Cagliari, Cittadella Universitaria, I-09042 Monserrato (Ca), Italy.
authors.forename: Alberto
authors.initials: A
authors.lastname: Anedda
authors.forename: Carlo M
authors.initials: CM
authors.lastname: Carbonaro
authors.forename: Francesca
authors.initials: F
authors.lastname: Clemente
authors.forename: Riccardo
authors.initials: R
authors.lastname: Corpino
authors.forename: P Carlo
authors.initials: PC
authors.lastname: Ricci
mesh_terms: D005782:Gels / Q000737:chemistry / Q000528:radiation effects; D049449:Luminescence; D010777:Photochemistry; D016062:Porosity; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry* / Q000528:radiation effects; D017356:Synchrotrons; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D005782:Gels; D012822:Silicon Dioxide