Dynamics of luminescence from Ru(bpy)/sub 3/Cl adsorbed on semiconductor surfaces
The dynamic spectroscopic properties of the excited state of Ru(bpy)/sub 3//sup 2 +/ adsorbed on powdered semiconductors (TiO/sub 2/,SnO/sub 2/,SrTiO/sub 3/, and ZrO/sub 2/), a powdered insulator (SiO/sub 2/), and microcrystalline methylviologen chloride have been investigated by using a pulsed dye laser (6 ns, 450 nm) or a YAG laser (25 ps, 530 nm) as an exciting light source. The time-resolved luminescence spectra of Ru(byp)/sub 3//sup 2 +/ adsorbed on oxide semiconductors were found to be classified into two components. One is blue shifted compared with the normal spectrum and originates from the tightly bound Ru(byp)/sub 3//sup 2 +/ whose excited state decays with a lifetime of 12-20 ns depending on the substrate. The short lifetime can be explained by an electron-transfer interaction between the excited Ru(byp)/sub 3//sup 2 +/ and the oxide semiconductor. The other originates from loosely bound Ru(byp)/sub 3//sup 2 +/ whose luminescent state has a longer lifetime (40-3500 ns) than that of the tightly bound RU(byp)/sub 3//sup 2 +/. The excited Ru(byp)/sub 3//sup 2 +/ on microcrystalline methylviologen chloride decays very fast with a lifetime of 3.3 ns, indicating a strong electron-transfer interaction. Hydrogen evolved due to the dye sensitization effect on Ru(byp)/sub 3//sup 2 +/ on TiO/sub 2/, although the efficiency was not good. This is explained by the poor adsorption ability of Ru(byp)/sub 3//sup 2 +/ onto TiO/sub 2/ and by recombination of electrons injected into the conduction band with the oxidized dyes.
- Research Organization:
- Toho Univ., Chiba-ken, Japan
- OSTI ID:
- 6440474
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:23; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
ALKALINE EARTH METAL COMPOUNDS
AZINES
BIPYRIDINES
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
DYNAMICS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HYDROGEN PRODUCTION
LUMINESCENCE
MATERIALS
MECHANICS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYRIDINES
RUTHENIUM COMPLEXES
SEMICONDUCTOR MATERIALS
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TIN COMPOUNDS
TIN OXIDES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES