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Amorphous titanium dioxide ͑TiO 2 ͒ thin films doped with rhodamine 6G ͑R6G͒ were deposited on glass substrates by the sol-gel process. The optical properties of the films were characterized by photoacoustic, excitation, and fluorescence spectroscopies. The absorption spectra of the R6G-doped TiO 2 films exhibited two well-defined absorption regions: an absorption band over 2.0 eV attributed to rhodamine 6G and a band above 3.0 eV corresponding to TiO 2 absorption. While the onset of the R6Gdoi:10.1063/1.2073972 fatcat:fxpcof7c45covlpmy42e6s247q