| Authors: | Trinh, Thi Loan Nguyen, Ngoc Long |
| Keywords: | Anatase and rutile TiO2;Hydrothermal method;Absorption and Photoluminescent spectra |
| Issue Date: | 2014 |
| Publisher: | H. : ĐHQGHN |
| Series/Report no.: | Vol. 30;No. 2 (2014) |
| Abstract: | Anatase TiO2 powders doped with 0.5, 1.0, 4.0 and 10 mol% Cr3+ have been prepared by hydrothermal method. The Cr3+ concentration and annealing effects on crystalline structure, absorption and photoluminescent spectra of the synthesized samples have been investigated. The band gap energy of anatase and rutile TiO2:Cr3+ powders with different dopant contents has been determined. Urbach energies (Eu) characterized for the structural disorder in the anatase and rutile TiO2 host lattice doped with Cr3+ ions also have been calculated with different impurity concentrations. At low annealing temperature (≤ 600 oC), the samples exhibited anatase phase and the photoluminescent spectra consisted of sharp peaks related to the 2E(2G) → 4A2(4F)transitions of ions Cr3+ in strong octahedral field. At high annealing temperature (1100 oC), the samples exhibited rutile phase and the photoluminescent spectra had a broad emission band, which was assigned to the 4T1(4F) → 4A2(4F) transitions within the Cr3+ ions in weak octahedral field. |
| Description: | p. 59-67 |
| URI: | http://repository.vnu.edu.vn/handle/VNU_123/56071 |
| ISSN: | 2588-1124 |
| Appears in Collections: | Mathematics and Physics |
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