Luminescence studies of semiconductor electrodes

Kelly, John J.; Kooij, Ernst S.; Meulenkamp, Eric A.

doi:10.1016/s0013-4686(99)00234-0

Cited by 22 publications

(9 citation statements)

References 79 publications

(116 reference statements)

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“…PL is simply the optical excitation of a sample to create electron-hole pairs call exciton. PL emission mainly results from the recombination of excited electron and holes, the lower PL intensity may indicate a lower recombination rate of electron/holes and higher separation efficiency under the same test conditions (Kelly et al, 1999;Chamarro et al, 1996). In this study, the PL emission spectra of the TiO 2 and 1.2% Ln 3+ -TiO 2 catalysts were examined in the range of 370-700 nm at a temperature of 77 K and the analytical results are shown in Fig.…”

Section: The Mechanisms Of Btex Degradation Enhancement By Using Ln 3mentioning

confidence: 93%

“…To better understand the effect of lanthanide ion doping on the separation of electron-hole pairs, the PL emission spectra of TiO 2 and different Ln 3+ -TiO 2 catalysts were examined in this study. The PL techniques have been given a great deal of attention in the field of photocatalysis over solid semiconductors as a useful probe for understanding the surface processes in which photogenerated electrons and holes takes part (Kelly et al, 1999). Radiative recombination of electron and hole either directly (band-band) or indirectly (via a bandgap state) gives light emission (PL).…”

Section: The Mechanisms Of Btex Degradation Enhancement By Using Ln 3mentioning

confidence: 99%

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Enhanced photocatalytic degradation of VOCs using Ln3+–TiO2 catalysts for indoor air purification

et al. 2005

Chemosphere

164

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Two types of lanthanide ion-doped titanium dioxide (Ln3+-TiO2) catalysts including La3+-TiO2 and Nd3+-TiO2 were prepared by a sol-gel method. The effects of the lanthanide ion doping on the crystal structure, surface area, adsorption properties, pore size distribution, and surface chemical state of the catalysts were investigated by means of XRD, BET, and XPS. As results, the crystal size decreased significantly, while the specific surface area, t-plot total surface area, micropore volume, and the total pore volume increased owing to the lanthanide ion doping. The nitrogen adsorption-desorption isotherms of the catalysts showed that the N2 adsorption ability of the Ln3+-TiO2 catalysts was better than the TiO2 catalyst. Among them, the 0.7% Ln3+-TiO2 catalysts demonstrated the highest adsorption ability. The photocatalytic activity of the catalysts was investigated in the experiments of the photocatalytic degradation of benzene, toluene, ethylbenzene and o-xylene (BTEX) in a gaseous phase. The photocatalytic efficiency of the TiO2 catalysts with the lanthanide ion doping was remarkably enhanced by BTEX removal. The 1.2% Ln3+-TiO2 catalysts achieved the highest photocatalytic activity. The enhanced photodegradation of BTEX is possibly due to the improved adsorption ability and the enhanced electron-hole pairs separation due to the presence of Ti3+ on the surface of Ln3+-TiO2 catalysts and the electron transfer between the conduction band/defect level and lanthanide crystal field state.

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Section: The Mechanisms Of Btex Degradation Enhancement By Using Ln 3mentioning

confidence: 93%

Section: The Mechanisms Of Btex Degradation Enhancement By Using Ln 3mentioning

confidence: 99%

Enhanced photocatalytic degradation of VOCs using Ln3+–TiO2 catalysts for indoor air purification

et al. 2005

Chemosphere

164

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“…In general, the luminescence of rare earth metals in oxide matrices depends very much on the local environment [51,52]. Photoluminescence can be quenched by defects and, in particular, quenching was observed in the case of defects created on purpose by co-doping [53].…”

Section: Powdersmentioning

confidence: 99%

Preparation and photoactivity of samarium loaded anatase, brookite and rutile catalysts

Bellardita

Paola

Parrino

et al. 2011

Applied Catalysis B: Environmental

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“…Electron-hole recombination can give light emission [20]. For the as-received sample a broad emission is found in the visible spectral range (curve (a) fig.…”

Section: -mentioning

confidence: 97%