Effect of dye concentration in Langmuir multilayer photoconductors

Sugi, Michio; Saito, Mitsuyoshi; Fukui, Tsunekatsu; Iizima, Sigeru

doi:10.1016/0040-6090(83)90353-x

Cited by 58 publications

(21 citation statements)

References 6 publications

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“…Roberts et al showed that there is a marked anisotropy in the conductivity of 9,10-substituted anthracene LB-films. Sugi et al − studied anisotropic photoconduction in dye sensitized Langmuir films upon incorporating surface active merocyanine dyes in a fatty acid matrix.…”

Section: Introductionmentioning

confidence: 99%

Sensitized and Intrinsic In-Plane Photocurrents in Langmuir−Blodgett Films of 7-(2-Anthryl)-1-heptanoic Acid

et al. 1998

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Langmuir−Blodgett (LB) films of an amphiphilic long-chain derivative of anthracene, of which the molecular packing shows a strong resemblance with the ab-plane of anthracene crystals, were investigated with respect to their photoconductive properties. Efficient photoinduced charge carrier generation and in-plane charge transport have been observed in LB-films of (2A7), using a gap configuration. The wavelength and intensity dependence of the quantum yield of the photocurrent in absence of a photosensitizer suggest an intrinsic bulkcharge generation mechanism. The intensity dependence of the photocurrent suggests a combination of nongeminate and alien recombination of charge carriers. The increase of the quantum yield in the presence of air is an indication that, upon photoexcitation, mobile holes are formed. By covering the multilayer assembly with a rhodamine containing monolayer, a significant increase of the quantum yield is obtained upon excitation of both the anthracene chromophore and the dye. In the case of dye excitation, the values and the field dependence of the photocurrents due to the photosensitized injection of holes from the layer of excited dye molecules into the 2A7 multilayer resemble those obtained for anthracene crystals covered by adsorbed dyes.

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Section: Introductionmentioning

confidence: 99%

Sensitized and Intrinsic In-Plane Photocurrents in Langmuir−Blodgett Films of 7-(2-Anthryl)-1-heptanoic Acid

et al. 1998

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“…The as-deposited films of DS-C20 1:2 mixture are associated with a J-aggregate with a sharp ani sotropic absorption band around 590 nm [8]. The transition dipole moment lies in the layer plane and is preferentially oriented to the dipping direc tion [9].…”

Section: Comparison With the Experimentsmentioning

confidence: 99%

Possibility of controlling the in-plane anisotropy in Langmuir-Blodgett films

Sugi¹,

Minari

Ikegami³

et al. 1988

Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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An extended model of flow orientation has been developed for analyz ing the in-plane anisotropy in Langmuir-Blodgett (LB) films. In the model deve loped, the velocity potential is derived for a sys tem with a two-dimensional fluid and a sink, which repres ent the mo no la yer at the air-water interface and the substrate, respectively. The rotatory mo tion in this field is examined assuming a Bingham plasticity. Thus obtained angular distribution function is found to satisfactorily explain the anisotropic absorbance and ESR line shape of the mixed LB films of a meroeyanine and a fatty acid, indic ating the possibility of controlling the in plane anisotropy in LB films by adjusting the values of parameters involved in the model.

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“…Another group of largely aromatic materials that has been extensively studied are the merocyanines and related dyes (24,37,38). Generally in order to achieve stable monomolecular assemblies, mixed layers of a fatty acid and the surface-active dye comprising a hydrophilic chromophore with a long alkyl substituent (see Figure 10) have been found necessary.…”

Section: Aromatic Materialsmentioning

confidence: 99%