TY - JOUR
T1 - Efficiency of porous silicon photosensitizer in the singlet oxygen-mediated oxidation of organic compounds
AU - Loponov, Konstantin
AU - Goller, Bernhard
AU - Moskalenko, Andriy
AU - Kovalev, Dmitry
AU - Lapkin, Alexei
PY - 2010/3/5
Y1 - 2010/3/5
N2 - The efficiency of singlet oxygen photosensitization by porous silicon is compared with that of a conventional dye photosensitizer tetraphenylporphine by means of singlet oxygen-mediated photooxidation of a-terpinene. Based on photoluminescence measurements it was concluded that the efficiency of porous silicon as a sensitizer is much lower than that of the conventional organic dye. The main reasons for this are the low quantum yield of long living photoinduced electronic excitations (excitones) confined in silicon nanocrystals and deactivation of singlet oxygen by H-terminated internal surface of porous silicon powder. Efficient quenching of excitons in porous silicon by 1,3-diphenylisobenzofuran via the direct energy transfer was demonstrated. This process is believed to be responsible for photobleaching of 1,3-diphenylisobenzofuran at its millimolar concentrations.
AB - The efficiency of singlet oxygen photosensitization by porous silicon is compared with that of a conventional dye photosensitizer tetraphenylporphine by means of singlet oxygen-mediated photooxidation of a-terpinene. Based on photoluminescence measurements it was concluded that the efficiency of porous silicon as a sensitizer is much lower than that of the conventional organic dye. The main reasons for this are the low quantum yield of long living photoinduced electronic excitations (excitones) confined in silicon nanocrystals and deactivation of singlet oxygen by H-terminated internal surface of porous silicon powder. Efficient quenching of excitons in porous silicon by 1,3-diphenylisobenzofuran via the direct energy transfer was demonstrated. This process is believed to be responsible for photobleaching of 1,3-diphenylisobenzofuran at its millimolar concentrations.
KW - photochemistry
KW - singlet oxygen
KW - porous silicon
UR - http://www.scopus.com/inward/record.url?scp=77950460281&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1016/j.jphotochem.2010.02.005
U2 - 10.1016/j.jphotochem.2010.02.005
DO - 10.1016/j.jphotochem.2010.02.005
M3 - Article
SN - 1010-6030
VL - 211
SP - 74
EP - 77
JO - Journal of Photochemistry and Photobiology A Chemistry
JF - Journal of Photochemistry and Photobiology A Chemistry
IS - 1
ER -