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Multi-band photoluminescence in TiO2 nanoparticles-assembled films produced by femtosecond pulsed laser deposition
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10.1063/1.4816251
/content/aip/journal/jap/114/4/10.1063/1.4816251
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816251

Figures

Image of FIG. 1.
FIG. 1.

SEM images of samples A, B, and C obtained at a magnification M = 120 kX.

Image of FIG. 2.
FIG. 2.

Photoluminescence spectra of samples A, B, and C obtained for above-bandgap (upper panel) and below-bandgap excitation (lower panel, the vertical arrow indicates the position of the excitation photons energy). Curves were vertically shifted and the same abscissa scales were used for the two graphs to help comparison. Vertical dashed-dotted lines evidence the PL emission bands centered at about 3.0 eV, 2.35 eV (observed at both above and below-gap excitation), and 1.5 eV (exhibited by sample C). Dotted vertical line (lower panel) evidences the PL peak positioned in the red region of the spectrum obtained for below-bandgap excitation.

Image of FIG. 3.
FIG. 3.

XRD data obtained for samples A (top panel), B (middle panel), and C (bottom panel) after annealing treatment. The graphs show the diffraction peaks associated with (110) planes of the rutile phase (R-TiO) and to (101) planes of the anatase phase (A-TiO). The solid curve represents the result of XRD simulations. In the inset, the XRD pattern obtained on as-grown samples A and C are shown.

Image of FIG. 4.
FIG. 4.

Left panel: Comparison of PL spectra obtained at above-bandgap excitation (E = 3.82 eV) on as-grown samples (dashed, red line) and after annealing (solid, black line). The dashed black vertical lines evidence thered-band emission enhanced by the annealing process. The dotted blue vertical line indicates the NIR resonance at 1.5 eV exhibited by sample C (both as-grown and after annealing) and slightly observable also in sample A after annealing. Right panel: Comparison of PL spectra obtained at below-bandgap excitation (E = 2.80 eV) on as-grown samples (dashed, red line) and after annealing (solid, black line).

Image of FIG. 5.
FIG. 5.

Peak-normalized photoluminescence spectra obtained for sub-bandgap excitation (2.80 eV photon energy) on as-grown and annealed samples. Spectra vertically shifted in order to facilitate comparison. Dashed blue curves represent individual spectral components of the “red band” PL emission, as obtained by a double-Gaussian fit.

Tables

Generic image for table
Table I.

Numerical parameters obtained from multi-peak Gaussian fit of PL spectra of as-grown TiO NPs samples. Quantities E, σ, w, represent peak position, spectral width and spectral weight of the ith Gaussian function, according to Eq. (1) .

Generic image for table
Table II.

Comparison between numerical parameters obtained from two-peak Gaussian fit of RB-PL spectra obtained at below-bandgap excitation on as-grown vs. annealed samples. Quantities E, σ, w, are defined in the same manner is in Table I .

Generic image for table
Table III.

Morphological and structural characteristics of the TiO nanostructured films produced by fs PLD, and main PL features observed before and after formation of TiO crystalline phases by samples annealing. The relative content of rutile (R) and anatase (A) phases in the samples after annealing, obtained by means of a simulation of XRD patterns based on kinematical theory, is also reported in the forth column.

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/content/aip/journal/jap/114/4/10.1063/1.4816251
2013-07-22
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multi-band photoluminescence in TiO2 nanoparticles-assembled films produced by femtosecond pulsed laser deposition
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816251
10.1063/1.4816251
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