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Structural conditions that leads to photoluminescence emission in : An experimental and theoretical approach
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10.1063/1.2956741
/content/aip/journal/jap/104/2/10.1063/1.2956741
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/2/10.1063/1.2956741

Figures

Image of FIG. 1.
FIG. 1.

(a) Ordered model of symmetric ST-o; (b) asymmetric model of network former dislocation, ST-f; (c) asymmetric model of network modifier dislocation, ST-m; and (d) asymmetric model of network former and modifier dislocation, ST-fm.

Image of FIG. 2.
FIG. 2.

XRD patterns of five samples of ST powder annealed at 673, 723, 773, 823, and for in an oxygen flow.

Image of FIG. 3.
FIG. 3.

(a) Ti -edge XANES spectra at room temperature for the ST powder annealed at 673, 723, 773, 823, and . (b) Normalized intensity of the pre-edge peak at the same temperatures.

Image of FIG. 4.
FIG. 4.

Spectral dependence of the absorbance of disordered ST annealed at 673, 723, , and of ordered ST powder annealed at for in an oxygen flow.

Image of FIG. 5.
FIG. 5.

Calculated energy band structure for (a) ST-o, (b) ST-f, (c) ST-m, and (d) ST-fm. The zero of the energy scale was set at the Fermi energy of ST-o.

Image of FIG. 6.
FIG. 6.

Total and atom-projected DOS for the (a) ST-o, (b) ST-f, (c) ST-m, and ST-fm models.

Image of FIG. 7.
FIG. 7.

Thermal dependent changes in the EPR spectrum of ST annealed at 673, 723, 773, and .

Image of FIG. 8.
FIG. 8.

Electron density maps of two horizontal planes of Ti–O: (a) ST-o model on the (0 0 0.25) (left) and (0 0 0.75) (right) planes; and (b) ST-f model, after displacement of the Ti atom, on the (0 0 0.25) (left) and (0 0 0.75) (right) planes. The ST-d model is used to speculate on the presence of the and hole .

Image of FIG. 9.
FIG. 9.

(a) Room temperature PL spectra of ST powder samples annealed at 673, 723, 773, 823, and for in an oxygen flow. The exciting wavelength was the line of a krypton ion laser. (b) Deconvolution PickFit of the samples annealed at 673 and .

Image of FIG. 10.
FIG. 10.

Wide band model. (a) Before excitation, where are donors and are acceptors; (b) excitation formation of STE; (c) after excitation recombination of and .

Tables

Generic image for table
Table I.

The fitting parameters of the five Gaussian peaks. of heat annealing; component of PL; component of PL; component of PL; component of PL; and component of PL.%

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/content/aip/journal/jap/104/2/10.1063/1.2956741
2008-07-21
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/2/10.1063/1.2956741
10.1063/1.2956741
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