期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 132, 期 2-3, 页码 1112-1118出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.12.083
关键词
Nanostructures; Color centers; Crystal fields; Defects; Luminescence
资金
- Department of Science and Technology (DST), India [S5/NM-33/2005]
Chromium doped TiO2 nanoparticles were synthesized by sol-gel method and studied by X-ray diffraction, Raman, UV-vis and photoluminescence spectroscopy. The size distribution and composition of the material were investigated by TEM and EDAX respectively. Incorporation of Cr3+ leads to the distortion of lattice structure and creation of oxygen vacancies as revealed by XRD and Raman spectra. Crystal field splitting of Cr3+ in substituted TiO2 results in a spin allowed and spin forbidden absorption peaks arising from Fano antiresonance. Luminescence spectra give emission lines of dopant as well as of oxygen related defect centers. (C) 2012 Elsevier B.V. All rights reserved.
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