Photophysics of polycyclic aromatic hydrocarbons adsorbed on silica gel surfaces. 3. Fluorescence quantum yields and radiative decay rate constants derived from lifetime distributions

  title={Photophysics of polycyclic aromatic hydrocarbons adsorbed on silica gel surfaces. 3. Fluorescence quantum yields and radiative decay rate constants derived from lifetime distributions},
  author={Yuan S. Liu and Paul. De Mayo and William R. Ware},
  journal={The Journal of Physical Chemistry},
The fluorescence quantum yields of six polycyclic aromatic hydrocarbons (PAHs) adsorbed on both hydroxylated and highly dehydroxylated silica gel surfaces have been measured, using a diffuse reflectance method, an integrating sphere method, and a secondary method based on diffuse reflectance. Consistent results were obtained from these different procedures. Radiative and nonradiative decay rate constants of these systems were derived from these quantum yield data together with the lifetime… Expand
Surface and adsorbates effects on the photochemistry and photophysics of adsorbed perylene on unactivated silica gel and alumina
Abstract The effect of the nature of the surface and solvent, the presence of coadsorbed species (O2, Ar and H2O) and the surface loading on some photophysical and photochemical properties ofExpand
Excited states and intermediate species of benzo[e]pyrene photolyzed in solution and adsorbed on surfaces
Benzo[e]pyrene (BeP) is a widespread polycyclic aromatic hydrocarbon found principally in highly polluted areas. The study of its photochemistry is important because of its possible toxic nature andExpand
Photophysical properties of nanostructured PPV-composites
Abstract We present photophysical properties, like spectral line-shape and site selectivity of photoluminescence (PL), PL quantum yields and Optically Detected Magnetic Resonance (ODMR) responses ofExpand
The Heavy-Atom Effect on the Photophysics of Aromatic Hydrocarbons in the Presence of Solid Clays.
The exchange of the original cation present on a Laponite clay (usually Na(+)) for heavy atoms such as Rb(+), Cs(+), and Tl(+) significantly alters the emission characteristics of some aromaticExpand
Photoluminescence and UV-VIS absorption study of poly (para-phenylene)-type ladder-polymers
Abstract Soluble poly(para-phenylene) (PPP)-type ladder-polymers have been shown to be suitable as active layers in light emitting diodes (LEDs). In this work we discuss the absorption spectra in theExpand
Energy Transfer Among Dyes on Particulate Solids†
The results show that large energy transfer rates can exist in a system devoid of any special molecular organization, and in the case of methylene blue, at a maximum value of nearly 40%. Expand
Excitation Energy Transfer and Trapping in Dye‐Loaded Solid Particles
The photophysics of several systems composed of a single dye or pairs of dyes attached to solid particles and singlet‐singlet energy transfer are studied in the dry solid state at high dye concentrations taking into account light scattering and inner filter effects. Expand
Photophysical studies of a solid oxide/surfactant interface: Photo-reactions in the nanospace of the silica gel – Triton X100 systemDedicated to Professor Frank Wilkinson on the occasion of his retirement.Work supported by the National Science Foundation.
Spectroscopic methods are used to study the adsorption of Triton X100 (TX100) to SiO2 in a hydrophobic medium. The studies show that random aggregates of the surfactant that can host hydrophobicExpand
Energy Transfer from Chemically Attached Rhodamine 101 to Adsorbed Methylene Blue on Microcrystalline Cellulose Particles †
Results demonstrate the occurrence of radiative and nonradiative singlet energy transfer from R101 to MB, and the combined effect of both kinds of energy transfer amounts to nearly 80% at the highest acceptor concentration, while non Radiative transfer reaches 60% both for thin and optically thick layers. Expand
Triplet quantum yields in light-scattering powder samples measured by laser-induced optoacoustic spectroscopy (LIOAS).
This work applies Laser-induced optoacoustic spectroscopy (LIOAS) to the determination of triplet quantum yields of Rose Bengal and Erythrosine B adsorbed on microcrystalline cellulose to study internal conversion in dye-loaded light-scattering powdered samples. Expand