Photoluminescence of samarium-doped TiO{sub 2} nanotubes

Journal Article · Sat Oct 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.08.012· OSTI ID:21580024

Park, Dong Jin ^[1]; Sekino, Tohru ^[1]; Tsukuda, Satoshi ^[1]; Hayashi, Asuka ^[2]; Kusunose, Takafumi ^[3]; Tanaka, Shun-Ichiro ^[1]

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1. Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)
2. Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)
3. Faculty of Engineering, Kagawa University, Hayashi 2217-20, Takamatsu, Kagawa 761-0396 (Japan)

Samarium (Sm)-modified TiO{sub 2} nanotubes (TNTs) were synthesized by low-temperature soft chemical processing. X-ray powder diffraction analyses of the synthesized Sm-doped and non-doped TNTs show a broad peak near 2{theta}=10{sup o}, which is typical of TNTs. The binding energy of Sm {sup 3}d{sub 5/2} for 10 mol% Sm-doped TNT (1088.3 eV) was chemically shifted from that of Sm{sub 2}O{sub 3} (1087.5 eV), showing that Sm existed in the TiO{sub 2} lattice. Sm-doped TNTs clearly exhibited red fluorescence, corresponding to the doped Sm{sup 3+} ion in the TNT lattice. The Sm-doped TNT excitation spectrum exhibited a broad curve, which was similar to the UV-vis optical absorption spectrum. Thus, it was considered that the photoluminescence emission of Sm{sup 3+}-doped TNT with UV-light irradiation was caused by the energy transfer from the TNT matrix via the band-to-band excitation of TiO{sub 2} to the Sm{sup 3+} ion. - Graphical Abstract: Samarium-doped TiO{sub 2} nanotubes (TNTs) having a nanotubular structure were synthesized by soft chemical route. It was revealed that the energy associated by the band-to-band excitation of TNT matrix transferred to the doped Sm{sup 3+} ions in the lattice, resulting in emission of strong and visible red fluorescence. Highlights: > Sm-doped TiO{sub 2} nanotubes synthesized by low-temperature soft chemical processing. > Sm{sup 3+} substitutes Ti{sup 4+} ions in the nanotube lattice. > Clear fluorescent emission due to the f-f transition at the Sm{sup 3+} in a crystal field environment. > Band-to-band excitation of TiO{sub 2} and followed energy transfer to Sm{sup 3+} causes the luminescence.

• OSTI ID: 21580024
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTRA
BINDING ENERGY
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL EXPLOSIVES
COHERENT SCATTERING
CRYSTAL FIELD
DIFFRACTION
DOPED MATERIALS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
ENERGY
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPLOSIVES
FLUORESCENCE
IONS
IRRADIATION
LUMINESCENCE
MATERIALS
METALS
NANOSTRUCTURES
NANOTUBES
NITRO COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOLUMINESCENCE
PHOTON EMISSION
RADIATIONS
RARE EARTH COMPOUNDS
RARE EARTHS
SAMARIUM
SAMARIUM COMPOUNDS
SAMARIUM IONS
SAMARIUM OXIDES
SCATTERING
SPECTRA
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TITANIUM COMPOUNDS
TITANIUM IONS
TITANIUM OXIDES
TNT
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET RADIATION
X-RAY DIFFRACTION