Time resolved ultraviolet photoluminescence of mesoporous silica.
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.
Anedda
Alberto
A
Dipartimento di Fisica, Università di Cagliari and INFM UdR Cagliari, Cittadella Universitaria, I-09042 Monserrato (Ca), Italy.
Carbonaro
Carlo M
CM
Clemente
Francesca
F
Corpino
Riccardo
R
Ricci
P Carlo
PC
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
D005782:Gels; D012822:Silicon Dioxide