Volume versus surface-mediated recombination in anatase TiO2 nanoparticles

We present an experimental study of the radiative recombination dynamics in size-controlled anatase TiO2 nanoparticles in the range 20–130 nm. From time-integrated photoluminescence spectra and picosecond time-resolved experiments as a function of the nanoparticle size, excitation density, and tempe...

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Bibliographic Details
Published in:Journal of applied physics 2009-09, Vol.106 (5)
Main Authors: Cavigli, Lucia, Bogani, Franco, Vinattieri, Anna, Faso, Valentina, Baldi, Giovanni
Format: Article
Language:English
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Summary:We present an experimental study of the radiative recombination dynamics in size-controlled anatase TiO2 nanoparticles in the range 20–130 nm. From time-integrated photoluminescence spectra and picosecond time-resolved experiments as a function of the nanoparticle size, excitation density, and temperature, we show that photoluminescence comes out from a bulk and a surface radiative recombination. The spectral shift and the different time dynamics provide a clear distinction between them. Moreover, the intrinsic nature of the emission is also proven, providing a quantitative evaluation of volume and surface contributions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3211291