Photoluminescence Characterization of Titanium Dioxide Systems

Photoluminescence characterisation of titanium dioxide (TiO₂) systems provides critical insight into electronic transitions, defect states and charge carrier dynamics that underpin a wide range of applications from photocatalysis to optoelectronic devices. When TiO₂ absorbs photons with energy equal to or greater than its band gap, electron–hole pairs are generated; their subsequent radiative recombination gives rise to photoluminescence (PL). The spectral position, intensity and decay kinetics of PL emissions depend sensitively on the crystal phase (anatase, rutile or brookite), intrinsic and extrinsic defects, surface chemistry and nanostructure morphology. By probing emission spectra under varying excitation wavelengths and environmental conditions, researchers can map trap states within the band gap, quantify recombination pathways and assess the influence of dopants or co-catalysts. Advances in time-resolved PL and imaging techniques further enable spatially resolved studies of grain boundaries, dislocations and heterojunction interfaces. Collectively, these methods refine our understanding of TiO₂’s photo-physical properties, guiding the design of materials with optimised light-absorption, charge-separation efficiency and tailored recombination lifetimes for enhanced performance in self-cleaning surfaces, environmental remediation, solar hydrogen generation and chemical sensing.

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Photoluminescence Characterization of Titanium Dioxide Systems publication trend

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Technical terms

Photoluminescence: Emission of light resulting from radiative recombination of photo-excited electron–hole pairs.

Charge carrier recombination: Process by which electrons and holes annihilate, releasing energy as photons or heat.

Trap state: Localised energy level within the band gap that can capture and release charge carriers, affecting recombination kinetics.

Polymorph: Crystalline form of TiO₂ (e.g. anatase, rutile, brookite) with distinct lattice structure and electronic properties.

Band gap: Energy difference between the valence band and conduction band in a semiconductor, determining light-absorption threshold.

References

1. Charge carrier recombination processes, intragap defect states, and photoluminescence mechanisms in stoichiometric and reduced TiO 2 brookite nanorods: an interpretation scheme through in situ photoluminescence excitation spectroscopy in controlled environment. Nanoscale (2024).
2. Photophysical Study of Electron and Hole Trapping in TiO2 and TiO2/Au Nanoparticles through a Selective Electron Injection. The Journal of Physical Chemistry C (2022).
3. Photoluminescence imaging of defects in TiO2: The influence of grain boundaries and doping on charge carrier dynamics. Applied Surface Science (2021).