Abstract
We have measured photoluminescence (PL) excitation spectra of TiO 2 powders with various rutile phase contents, and have found a correlation between the energy level of the PL excitation band ( E PLE) and the rutile phase content. The E PLE of the mixture and its band-gap energy were redshifted compared to those expected from its rutile phase content. We can explain this correlation by considering the charge transfer between the anatase and rutile TiO 2 nanoparticles of the mixture. These results suggest that the extent of charge transfer can be estimated by PL spectroscopy.
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