Publication: Singlet oxygen generation by nanoporous silicon: Photoluminescence dynamics in magnetic field
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Issued Date
2020
Resource Type
File Type
application/pdf
ISSN
9574484
Other identifier(s)
2-s2.0-85073646926
Rights Holder(s)
มหาวิทยาลัยศรีนครินทรวิโรฒ
Bibliographic Citation
Nanotechnology. Vol 31, No.3 (2020)
Suggested Citation
Aliev G.N., Amonkosolpan J., Wolverson D. Singlet oxygen generation by nanoporous silicon: Photoluminescence dynamics in magnetic field. Nanotechnology. Vol 31, No.3 (2020). doi:10.1088/1361-6528/ab4442 Retrieved from: https://hdl.handle.net/20.500.14740/4979
Author(s)
Abstract
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. © 2019 IOP Publishing Ltd.