Emission-photoactivity cross-processing of mesoporous interfacial charge transfer in Eu3+ doped titania
Literature Information
Céline Marie Leroy, Hong Feng Wang, Alexandre Fargues, Thierry Cardinal, Véronique Jubera, Mona Treguer-Delapierre, Cédric Boissière, David Grosso, Clément Sanchez, Bruno Viana, Fabienne Pellé
Periodic mesoporous Eu3+ doped titania materials were obtained through the EISA (Evaporation Induced Self Assembly) process. Eu3+ ions, entrapped within the semi-crystalline walls of the highly porous framework, appear to be advantageous during the probing of surface photochemical reactions. Its emission intensity is very sensitive to the presence of physisorbed molecules, in gas or liquid phase, that reside within the pores. In particular, strong fluctuations in intensity of the 5D0 → 7F2 transition were observed under UV light exposure on the time scale of tens of seconds. The emission modulation dynamics show a strong correlation with the crystallinity of the titania matrix. Correlation of the emission with the photocatalytic activity of the semiconductor for photodegradation of an organic molecule is observed. A model is proposed to describe the involved mechanisms.
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