The Mechanism of Generation of Singlet Oxygen in the Presence of Excited Nanoporous Silicon

Samosvat, D. M.; Chikalova-Luzina, O. P.; Khromov, V. S.; Zegrya, A. G.; Zegrya, G. G.

doi:10.1134/s1063785018060093

Cited by 3 publications

(1 citation statement)

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“…The recent theoretical calculation [72,73] of the rate of ET (due to the exchange only mechanism) from 2D excitons in a 1.2μm thick Si layer to an adsorbed O 2 molecule gives the value of = t 10 10 The other ET mechanisms, e.g. charge transfer, can also be involved [74] and they may result in the experimentally observed ET efficiency, however, we believe that the exchange mechanism is dominant and we do not consider those charge transfer related processes in our model.…”

Section: A7 Et Ratementioning

confidence: 99%

Singlet oxygen generation by nanoporous silicon: photoluminescence dynamics in magnetic field

Aliev

Amonkosolpan²,

Wolverson³

2019

Nanotechnology

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Singlet oxygen generation in porous silicon (PSi) was investigated by a magneto-optical experiment. Photoluminescence (PL) quenching due to an energy transfer (ET) process mediated by an exchange interaction was monitored in the spectral range 1.4–2.5 eV and in a magnetic field of 0–6 Tesla at different levels of oxygen concentration and excitation pump power. When a magnetic field was applied, both PL recovery and, for magnetic fields below 2 Tesla and high concentrations of oxygen, an unusual additional pump power dependent quenching of the PL was observed. A rate equation model describing the behavior of PL from PSi with oxygen adsorbed at cryogenic temperatures in magnetic field was developed. The model has been expanded to cover the ET process as a function of the nanoparticle size.

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Section: A7 Et Ratementioning

confidence: 99%