Time resolved ultraviolet photoluminescence of mesoporous silica |
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Authors: | Anedda Alberto Carbonaro Carlo M Clemente Francesca Corpino Riccardo Ricci P Carlo |
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Institution: | Dipartimento di Fisica, Università di Cagliari and INFM UdR Cagliari, Cittadella Universitaria, I-09042 Monserrato (Ca), Italy. |
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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. |
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