Optical Properties of Anatase and Rutile TiO2:Cr3+ Powders

Trinh Thi Loan, Nguyen Ngoc Long

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Published Jun 15, 2014

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LOAN, Trinh Thi; LONG, Nguyen Ngoc. Optical Properties of Anatase and Rutile TiO2:Cr3+ Powders. VNU Journal of Science: Mathematics - Physics, [S.l.], v. 30, n. 2, june 2014. ISSN 2588-1124. Available at: <https://js.vnu.edu.vn/MaP/article/view/743>. Date accessed: 04 may 2024.
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Issue
Vol 30 No 2
Section
Review Article

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Abstract

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.

Keywords: Anatase and rutile TiO2, Hydrothermal method, Absorption and Photoluminescent spectra.

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