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Preparation and Spectroscopy Properties of Eu2(CA)3(phen)2 Doped Eu3+/TiO2 Nano-Powders

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The 1% Eu3+ doped Eu3+/TiO2 nano-powders were prepared via sol-gel method by using Eu(NO3)3 and Eu2(CA)3(phen)2 (CA: camphoric acid; phen: 1,10-phenanthroline) as precursors respectively, and the samples were characterized by thermal analyses (TG-DTA), X-ray powder diffraction(XRD), scanning electron microscope(SEM), Fourier transform infrared spectroscopy (FTIR), UV-Vis absorption spectra and fluorescence spectra for their microstructure, morphology and spectroscopy properties. The results of TG-DTA and XRD indicate that the increasing trend of particle size and the conversion temperature of crystalline phase of the as prepared samples was restrained when using organic complexes Eu2(CA)3(phen)2 as the do pant. The particle size was decreased from 9 to 7 nm, and the name powders were still anatase TiO2 when the calcination temperature was increased up to 500 . The absorption peak at about 370 nm in UV-Vis spectra was red-shifted when doping with organic complexes Eu2(CA)3(phen)2, namely the doped TiO2 nano powders have the ability of visible light responding. The characteristic absorption peaks of organic complex did not appear in FTIR spectrum, indicating that the Eu3+ has little impact on the formation process of TiO2 crystal when using Eu2(CA)3(phen)2 as precursor. The result of fluorescence spectrum indicates that the characteristic transition of Eu3+ at 578 nm (corresponding to 5 D 07 F 0 )590 nm(5 D 07 F 1) and 612 nm (5 D 07 F 2) appeared in both samples, in which the peak at 612 nm was the characteristic red transmutation peak. When doping Eu3+ with the same content, the nano-powders using Eu2(CA)3(phen)2 as precursor obtain higher luminescence intensity. Therefore, by using a simple approach, the authors prepared the light-emitting rare earth inorganic nano-powders with better luminescence property and high stability, and such inorganic nano-powders might have potential applications in many fields.
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Keywords: Doping; Eu3+ ion; Spectroscopy properties; TiO2 nano-powder

Document Type: Research Article

Publication date: 01 August 2010

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  • Spectroscopy and Spectral Analysis, founded in 1981, is sponsored by the Chinese Central Iron & Steel Research Institute. "Spectroscopy and Spectral Analysis" has been indexed in SCI(1999), Ei(1992), MEDLINE(1999), and AJ (1999). "Spectroscopy and Spectral Analysis" publishes original contributions on various fields in Spectroscopy, including research results on laser spectroscopy, IR, Ramn, UV/Vis, Optical Emission, Absorption and Fluorescence spectroscopy, X-ray Fluorescence, and Spectrochemical Analysis, as well as Reseach paper, Research notes, Experimental Technique and Instrument, Review and Progress on the latest development of spectroscopy and spectrochemical anlysis, etc. "Spectroscopy and Spectral Analysis" is published monthly by Peking University Press with book sizes of large 16-mo format , and 292 pages per issue.
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