ChemInform Abstract: Photophysics of Quantized Colloidal Semiconductors Dramatic Luminescence Enhancement by Binding of Simple Amines.

Dannhauser, Thomas J.; O’Neil, Michael; Johansson, K.; Whitten, David G.; McLendon, George

doi:10.1002/chin.198706007

Cited by 4 publications

(9 citation statements)

References 1 publication

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“…In the case of the unpromoted V2Os catalyst, the surface V=0 is located only on the (010) plane of the V205, and only half of the surface vanadium ions on the (010) plane form the surface V=0 species. 23 As for the acid sites, the IR spectra of adsorbed NH3 shown in Figure 7 indicate that all acid sites are Bransted acid.…”

Section: Discussionmentioning

confidence: 95%

Surface chemical structures of vanadium pentoxide-phosphorus pentoxide catalysts

Satsuma¹,

Hattori²,

Furuta³

et al. 1988

J. Phys. Chem.

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Section: Discussionmentioning

confidence: 95%

Surface chemical structures of vanadium pentoxide-phosphorus pentoxide catalysts

Satsuma¹,

Hattori²,

Furuta³

et al. 1988

J. Phys. Chem.

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“…'Temperature of peak maximum of microcalorimetric endotherm. 4 Width at half-height of microcalorimetric endotherm. 'Calorimetric enthalpy of endotherm (cal/g of polymer).…”

Section: Methodsmentioning

confidence: 99%

Microcalorimetric detection of lower critical solution temperatures in aqueous polymer solutions

Schild¹,

Tirrell²

1990

J. Phys. Chem.

945

800

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“…When the circuit is closed, the total hole current is equal to the difference between the rate of injection and the rate of recombination. Thus, from ( 7) and (8) y'po t-ipP / V \ . \ / + ß-<'-" )^/ + 5 <: (9) Single Carrier Photovoltage, Vx.…”

Section: The Lcp Modelmentioning

confidence: 99%

“…In the equivalent circuit (Figure 13), this back-reaction is modeled as a shunt resistance (7?s). Thus y'pb ~ttpsFc (8) where = 1 / A R« is the "rate constant" of the back-reaction in units of "1 cm"2 and A is the area of the cell. Chemically this is equivalent to a first-order reaction.…”

Section: The Lcp Modelmentioning

confidence: 99%

“…and 1 (open diamonds). Back-Reaction. The expression describing the rate of the back-reaction of holes at the illuminated electrode, (8), is valid only between the limits VX^V (-Vc) < 0, i.e., in the power-curve region. The lower limit (Vx) stems from the fact that the rate of the back-reaction cannot exceed the rate of the forward reaction at steady state (holes cannot recombine faster than they are generated).…”

Section: The Lcp Modelmentioning

confidence: 99%

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Photovoltaic effect in symmetrical cells of a liquid crystal porphyrin

Gregg¹,

Fox²,

Bard³

1990

J. Phys. Chem.

214

166

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the organizing element which promoted complex formation was the polymer, to which pyrochlorophyll was bound by ligation and DTNB by counterion attraction. In the present case, the organizing element is evidently the cationic micelle.Chl and its relatives have been examined in almost every conceivable kind of model system in efforts to imitate photosynthesis. To our recollection, however, this is the first report of its presence in cationic inverted micelles. Chl has been reported in anionic inverted micelles of aerosol OTIS though these may have been more in the nature of microemulsions, with a clearly defined internal aqueous phase. Inverted micelles have been promoted as models of the interiors of proteins or lipoproteins, where numerous biological reactions, including the primary processes of (18) Pileni, M. P.; Lerebours, B.; Brochette, P.; Chevalier, Y. J . Photochem. An unusual photovoltaic effect has been observed in symmetrical cells consisting of indium-tin oxide (ITO) electrodes and a liquid crystal porphyrin (LCP, zinc octakis(8-octyloxyethy1)porphyrin). The illuminated electrode acts as a photoanode; the direction of current flow reverses upon reversal of the direction of illumination. Stable photocurrents of up to ca. 0.4 mA/cm2 have been measured under illumination with a 150-W Xe lamp (intensity ca. 150 mW/cm2). The photocurrentincreases linearly with incident light intensity (I,) at all wavelengths up to I, > 1OIs photons s-I cm-2. This photovoltaic effect is interpreted as resulting from exciton dissociation at the illuminated electrode leading to the preferential photoinjection of electrons into the IT0 electrode and holes into the porphyrin. This appears to be the first unambiguous example of a photovoltaic cell controlled entirely by interfacial kinetics. The predominance of the photoinjection process in these capillary-filled liquid crystal (solid-phase) films, and its relative absence in similar cells containing evaporated films of porphyrins and phthalocyanines, is attributed to the single-crystal-like character of the LCP films. The wavelength dependence of the photocurrent (action spectrum) is a function of the cell thickness, correlating with the absorption spectrum for thin cells, while it is inversely correlated for thicker cells. This is attributed to an effective cell resistance that is determined by the number and spatial distribution of carriers photogenerated in the bulk LCP. An approximate mathematical model of these two processes, photoinjection at the interface coupled with photoconductivity in the bulk LCP, is proposed which reproduces the experimental results. (20) (a) Chandrasekhar, S. Mol. Cryst. Liq. Cryst. 1981, 63, 171. (b) Destrade, C.; Tinh, N. H.; Gasparoux, H.; Malthete, J.; Levelut, A. M. Mol. Tran-Thi, T.-H.; Briois, V.; Simon, J.; Ohta, K.

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ChemInform Abstract: Photophysics of Quantized Colloidal Semiconductors Dramatic Luminescence Enhancement by Binding of Simple Amines.

Abstract: Dramatic increases (up to 450%) in the quantum yield for exciton emission are observed when small amounts of certain bases (e.g.

Cited by 4 publications

References 1 publication

Surface chemical structures of vanadium pentoxide-phosphorus pentoxide catalysts

Surface chemical structures of vanadium pentoxide-phosphorus pentoxide catalysts

Microcalorimetric detection of lower critical solution temperatures in aqueous polymer solutions

Photovoltaic effect in symmetrical cells of a liquid crystal porphyrin

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