Changing the environment of mesoporous silica to investigate the origin of UV and visible photoluminescence of surface centers

• Published in: Journal of materials science Vol. 48; no. 12; pp. 4452 - 4458
• Main Authors: Carbonaro, C. M., Corpino, R., Ricci, P. C., Salis, M., Anedda, A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.06.2013; Springer; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Dehydration; Emission; Emission analysis; Emittance; High vacuum; Investigations; Materials Science; Media; Origins; Photoluminescence; Polymer Sciences; Porosity; Silica; Silicon dioxide; Solid Mechanics; Mesoporous Silica; Blue Band; Silica Surface; Excitation Pulse; Dehydration Reaction
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-013-7264-2

The surface-related emission properties of mesoporous silica are investigated by changing the environment surrounding the silica surface, that is by filling the pores of the transparent matrix with different media such as air and nitrogen, or under high vacuum conditions. The interaction of the emitting surface centers with the filling media induces large modifications on the surface of silica matrices and modifies the optical features of the emitting centers. The aim of the paper is to assign the origin of the gathered UV and visible emissions: the modifications induced by the different treatments support the involvement of OH species in the formation of the surface centers responsible of both the emissions and can be rationalized within the framework of two different dehydration reaction schemes previously proposed.