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Aver'yanov, E. M.
Effective refractive index of a two-dimensional polycrystal / E. M. Aver’yanov // JETP Letters. - 2015. - Vol. 101, Is. 10. - P. 685-689, DOI 10.1134/S0021364015100033. - Cited References: 28 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SPECTROSCOPIC ELLIPSOMETRY
   CONJUGATED POLYMERS
   LOCAL-FIELD
   FILMS
   CONDUCTIVITY
   POLYFLUORENE
   ANISOTROPY
   DISPERSION
   MEDIA
Аннотация: A relation of the effective refractive index of a two-dimensional polycrystalline dielectric film in the transparency region to the refractive indices n1 and n2 of crystallites at the positions of axes 1 and 2, respectively, of refraction ellipsoids of the crystallites in the plane of the film has been obtained. This relation and the relation L* = (L1 + L2)/2 between the components of the Lorentz tensors for the film and crystallites have been confirmed by comparison with experimental data for conjugate-polymer films with uniaxial domains.

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Публикация на русском языке Аверьянов, Евгений Михайлович. Эффективный показатель преломления двумерного поликристалла [Текст] / Е. М. Аверьянов // Письма в Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 101 Вып. 10. - С. 761-765

Доп.точки доступа:
Аверьянов, Евгений Михайлович
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Aver'yanov, E. M.
Influence of the dimension of a polycrystalline film and the optical anisotropy of crystallites on the effective dielectric constant of the film / E. M. Aver’yanov // Phys. Solid State. - 2016. - Vol. 58, Is. 8. - P. 1634-1641, DOI 10.1134/S1063783416080035. - Cited References: 41 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
EFFECTIVE REFRACTIVE-INDEX
   CONJUGATED POLYMER
   POLY(P-PHENYLENE VINYLENE)
   SPECTROSCOPIC ELLIPSOMETRY
   ELECTRICAL-CONDUCTIVITY
   LOCAL-FIELD
   THIN-FILMS
   DISPERSION
   POLYFLUORENE
   DEVICES
Аннотация: The dimension D of a polycrystalline film and the optical anisotropy m = εz/εx of uniaxial crystallites with the principal components εx = εy and εz of the tensor of the dielectric constant have been shown to produce a strong influence on the effective dielectric constant εD* and the effective refractive index nD* = (εD*)1/2 of the film in the optical transparency region, as well as on the boundaries of the intervals BDl ≤ εD* ≤ BDu. The intervals Δ2(m) = B2l–B2u and Δ3(m) = B3l–B3u are separated by a gap for m in the range 1 m 2, whereas the theoretical dependence ε2*(m) is separated by a gap from the interval Δ3(m) for m in the range 1 m 4. This is confirmed by a comparison of the experimental (noP) and theoretical (nD*) ordinary refractive indices for uniaxial polycrystalline films of the conjugated polymer poly(p-phenylene vinylene) (PPV) with uniaxial crystallites and appropriate values of m. In the visible transparency region of the PPV films with a change in m(λ) in the range 2 m(λ) 3 due to the dependence of the components εx,z(λ) on the light wavelength λ, the refractive indices noP2(λ) 3 near the electronic absorption band of the crystallites, the values of εoP(λ) lie in the region of the overlap of the intervals Δ2(m) and Δ3(m). The boundaries mc of the range 1 m mc are determined, for which the interval Δ2(m) is separated by a gap from the dependences ε3*(m) corresponding to the effective medium theory with spherical crystallites and hierarchical models of a polycrystal, as well as from the proposed new dependence ε3*(m).

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Публикация на русском языке Аверьянов, Евгений Михайлович. Влияние размерности поликристаллической пленки и оптической анизотропии кристаллитов на эффективную диэлектрическую проницаемость пленки [Текст] / Е. М. Аверьянов // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 8. - С. 1580–1586

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Аверьянов, Евгений Михайлович
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Synthesis and photophysical properties of copolyfluorenes for light-emitting applications: Spectroscopic experimental study and theoretical DFT consideration / R. Y. Smyslov [et al.] // Polymer. - 2019. - Vol. 168. - P. 185-198, DOI 10.1016/j.polymer.2019.02.015. - Cited References: 45. - The quantum yield measurements were performed at the Center for Optical and Laser Materials Research, St. Petersburg State University. P. Avramov gratefully acknowledges the financial support of National Research Foundation of Republic of Korea under Grant No. NRF-2017R1A2B4004440. This work has been carried out using computing resources of the federal collective usage center Complex for Simulation and Data Processing for Mega-science Facilities at NRC "Kurchatov Institute" . - ISSN 0032-3861. - ISSN 1873-2291

РУБ Polymer Science
Рубрики:
BETA-PHASE FORMATION
   SINGLE POLYMER
   POLYFLUORENE
   BLUE
   COPOLYMERS
Кл.слова (ненормированные):
Suzuki cross-coupling -- Yamamoto polycondensation -- Density functional theory
Аннотация: Using Suzuki and Yamamoto coupling reactions, copoly-(9,9-dioctylfluorenes) (CPF) were synthesized and compared regarding their photophysical properties using the spectroscopic and ab initio DFT approaches. The CPFs were functionalized by benzo [2,3,5] thiadiazole (BT) or carbazole-3,6-diyl (3,6-Cz). The latter was used to introduce different luminophore fragments, including Nile red and 4-pyrrolidinyl-1,8-naphthalimide derivatives. The effect of the two synthesis techniques on the polymer microstructure, the influence of embedding of 3,6-Cz moieties in the polymer backbone on polymer structuring, and the impact of the end groups like novel quinoxaline-containing compounds on the luminescent properties of CPFs were investigated. By comparing electron density distribution using the ab initio DFT approach with photoluminescence, it was shown that Suzuki reaction provides a chain microstructure with individual BT fragments separated by 9,9-dioctylfluorene monomeric units, while Yamamoto reaction leads to the blocks of BT units. This effect leads to different CPF photophysical properties (absorption and emission spectra).

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Держатели документа:
Russian Acad Sci, Inst Macromol Cpds, Bolshoy 31, St Petersburg 199004, Russia.
NRC Kurchatov Inst, Petersburg Nucl Phys Inst, Mkr Orlova Roscha 1, Gatchina 188300, Leningrad Regio, Russia.
Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Fed Res Ctr, Kirensky Inst Phys, Siberian Branch,Krasnoyarsk Sci Ctr, Akad Gorodok 50-38, Krasnoyarsk 660036, Russia.
St Petersburg State Univ, Unive Skaya Nab 7-9, St Petersburg 199034, Russia.
Yaroslavl State Tech Univ, Moskovskii 88, Yaroslavl 150023, Russia.
Kyungpook Natl Univ, Dept Chem & Greennano Mat Res Ctr, 80 Daehakro, Daegu 41556, South Korea.

Доп.точки доступа:
Smyslov, Ruslan Yu; Tomilin, F. N.; Томилин, Феликс Николаевич; Shchugoreva, I. A.; Nosova, G. I.; Zhukova, E. V.; Litvinova, L. S.; Yakimansky, A. V.; Kolesnikov, I.; Abramov, I. G.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Avramov, P. V.; Аврамов, Павел Вениаминович
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