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(A) Photoluminescence spectra of TiO2-x/TiO2 (400 °C)-based sample at different applied voltage; (B) The changes in spectral position of photoluminescence maximum vs. voltage of TiO2-x/TiO2 (400 °C)-based sample; (C) The changes in photoluminescence maximum intensity vs. voltage of TiO2-x/TiO2 (400 °C)-based sample; (D) The plot of temperature vs. voltage of TiO2-x/TiO2 (400 °C)-based sample.
