Luminescence of 2,6-Distyrylpyridine-Doped Titania Nanostructured Monoliths

Autor: S. A. Tomás, Georgina Beltrán-Pérez, V.M. Castaño, J. Martínez-Juárez, R. Palomino-Merino, M. Judith Percino, G. Juárez-Díaz, R. Lozada-Morales, Víctor M. Chapela
Rok vydání: 2011
Předmět:
Zdroj: Journal of Electronic Materials. 40:2388-2391
ISSN: 1543-186X
0361-5235
DOI: 10.1007/s11664-011-1778-7
Popis: Nanocrystalline 2,6-distyrylpyridine (2,6-DStP)-doped TiO2 monoliths were prepared by the sol–gel technique. Different concentrations of the 2,6-DStP doping agent were utilized. Samples were characterized by x-ray diffraction, photoacoustic spectroscopy (optical absorption), and luminescence spectroscopy. As-prepared samples showed amorphous structure and traces of the anatase crystalline phase of TiO2 after annealing at room temperature. The samples exhibited average particle size from 6 nm to 7.5 nm for molar concentration of 2,6-DStP from 0.0% to 0.03%. The photoacoustic spectra revealed the absorption edge at wavelength around 375 nm (3.38 eV), which is attributed to TiO2, and a gap shift varying from 1.91 eV, to 2.41 eV, to 1.86 eV with the molar concentration of 2,6-DStP. Photoluminescence spectroscopy showed three different bands around 555 nm, 607 nm, and 779 nm when the samples were excited with 407 nm, 488 nm, and 633 nm laser lines, respectively.
Databáze: OpenAIRE
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