Electronic absorption spectra of symmetric cationic dye in constant electric field

Давиденко, Н. А.; Zabolotny, M. A.; Ishchenko, A. A.

doi:10.1016/j.saa.2004.04.020

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…The PD concentration was 1 wt.%, which usually ensures efficient photogeneration and transport of charge carriers [1, [5][6][7], and in this case no substantial aggregation of the dyes occurs. The procedure for measuring the optical density (D) and fluorescence intensity (I L ) spectra is described in [2,3]. As the light sources for excitation of luminescence, we used a semiconductor light-emitting diode with l 1 = 418 nm and a semiconductor laser with l 2 = 532 nm.…”

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confidence: 99%

“…As the light sources for excitation of luminescence, we used a semiconductor light-emitting diode with l 1 = 418 nm and a semiconductor laser with l 2 = 532 nm. The D and I L values, as in [3], were measured before the external electric field was turned on (D 0 and I L0 ) and after it was turned on (D E and I LE ) with E = 1·10 8 V/m. From these measurements, we calculated the values of dD E = (D E -D 0 )/D 0 and dI E = (I LE -I L0 )/I L0 .…”

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confidence: 99%

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Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

et al. 2008

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We have observed that in an external d.c. electric field, in the differential fluorescence spectra of both symmetric and asymmetric polymethine dyes in a polymer film, the intensity of the emission in the long-wavelength region of the band increases while the intensity in the short-wavelength region decreases. In symmetric polymethines, these effects are opposite to those in the differential absorption spectra, while in asymmetric polymethines they are symbatic. The spectral effects were interpreted by a change in the probability of the vibronic transitions due to redistribution of electron density in the chromophore, in the ground state and the excited state of the dye, in an external electric field.Key words: polymethine dyes, electronic structure, absorption and fluorescence spectra, external electric field.Polymethine dyes (PDs) have recently been used as working media in unconventional fields for them, such as information technology, photovoltaics, and electroluminescence [1]. These media are used in an external electric field of strength 10 8 V/m, which is comparable with the intraatomic fields in conjugated organic molecules. The targeted search for dyes for such media is why there is a need to establish the characteristics of the effect of a external d.c. electric field on their spectral luminescence properties as a function of the dye structure. In [2, 3], such characteristics were obtained for the absorption spectra. In this paper, we have made the first attempt to study the effect of an external electric field on the fluorescence spectra of cationic polymethine dyes.As the dyes, we used the cationic symmetric PDs I-III and the asymmetric PD IV [4]. The latter is a hybrid of the corresponding symmetric PD I and II. We used polyvinylethylal (PVE) as the polymer matrix. This polymer is characterized by good film-forming and optical properties. It has high ionization potential and low electron affinity energy, and consequently it does not have either electronic or hole intrinsic conductivity.

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confidence: 99%

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confidence: 99%

Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

et al. 2008

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“…However, the proper absorption of these semiconductors had been accomplished within a narrow optical range; therefore, their photosensitivity is insignificant. Increasing the photosensitivity causing an increase of the photoconductivity and other photosensitive characteristics also is achieved by the creation upon the basis of a new molecular semiconductor composites formed due to the photoconductive effect of electron-hole pairs (1)(2)(3)(4), which possess the high separation sensitization of the of the p-n transitions. The impurities, which absorb light in the visible region are the centers of the charge carriers photogeneration, are usually used as a components of such composites.…”

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confidence: 99%

Phosphorescence of the π‐conjugated Polymers with Complex Forming C₆₀Fullerenes During Irradiation

Dmytrenko

Кulish

Kоbus

et al. 2008

Fullerenes, Nanotubes and Carbon Nanostructures

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The photoluminescence spectra and the optical conductivity of the precipitated films of the pure organic molecular PVK polymers and their nanocomposites containing C 60 fullerenes with the concentration from 0,5 to 3wt% were studied. The photoluminescence spectra for the composites containing considerable amount of fullerenes irradiated with the 140 keV copper ions and the dose 4,2 . 10 14 ion/cm 2 also were investigated. It is shown that the formation of both the intermolecular complexes causing changes of the spectra of photoluminescence and interband electron transitions in the nanocomposites takes place. The ionic implantation with copper leads to the creation of the metallic centers that influences on the formation of new channels of the radiationless recombination and transport of the photogenerated electron-hole pairs.

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“…tween two polarizers for which the angle between the planes of polarization was 90 o . The electric field of potential E = 1⋅10 8 V/m in the FC was created using a corona discharge [10]. The corona device with the sample was placed in a thermostat in order to avoid light depolarization effects in the SnO 2 :In 2 O 3 layers [11].…”

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Electrooptical effect in polymeric composites containing heterometallic Cu(II)/Mn(II) complexes

et al. 2007

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We studied the effect of an electric field on the transmission of linearly polarized light through films of composites based on polyvinylbutyral doped with particles of Cu(II)/Mn(II) complexes with "skeleton" and "planar" structures. The action of an electrostatic field causes light absorption to become anisotropic. The effect increases with increasing distance between the cation and anion. Its sign reverses if the spatial structure of the complex is changed. A phenomenological model is proposed according to which the electrooptical properties of the composites are due to a change in the mutual orientation of complex building blocks on exposure to an external electric field.

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Electronic absorption spectra of symmetric cationic dye in constant electric field

Cited by 12 publications

References 6 publications

Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

Phosphorescence of the π‐conjugated Polymers with Complex Forming C₆₀Fullerenes During Irradiation

Electrooptical effect in polymeric composites containing heterometallic Cu(II)/Mn(II) complexes

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Electronic absorption spectra of symmetric cationic dye in constant electric field

Cited by 12 publications

References 6 publications

Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

Effect of a d.c. electric field on the fluorescence spectra of cationic polymethine dyes in a polymer film

Phosphorescence of the π‐conjugated Polymers with Complex Forming C60Fullerenes During Irradiation

Electrooptical effect in polymeric composites containing heterometallic Cu(II)/Mn(II) complexes

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Phosphorescence of the π‐conjugated Polymers with Complex Forming C₆₀Fullerenes During Irradiation