Observation of an ultraviolet emission band in TiO2 nanocrystals doped with Eu3+
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The photoluminescence spectra of titanium dioxide (TiO2) nanocrystals doped with Eu3+ (molar ratio Eu3+/TiO2 = 0, 1, 2, 4%) are investigated under different excitation wavelengths. An ultraviolet band of emission energy higher than the energy gap is found for excitation wavelengths larger than 315 nm when the Eu3+ content is higher than 2%. The new emission band redshifts and its emission intensity is intensified with the increase of excitation wavelength. The emission mechanism for the new ultraviolet emission band is analyzed.
KeywordsTiO2 Excitation Wavelength Emission Band Anatase TiO2 Indirect Transition
This work was supported by the National Natural Science Foundation of China (Grant No. 10574121 and 10025420), Natural Science Foundation of Anhui Province of China (Grant No. 05021015), Chinese Education Ministry and Chinese Academy of Sciences.