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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Timofeev I. V., Gunyakov V. A., Sutormin V. S., Myslivets S. A., Arkhipkin V. G., Vetrov S. Ya., Lee W., Zyryanov V. Ya.
Заглавие : Geometric phase and ο-mode blueshift in a chiral anisotropic medium inside a Fabry-Pérot cavity
Место публикации : Phys. Rev. E: American Physical Society, 2015. - Vol. 92, Is. 5. - Ст.052504. - ISSN 15393755 (ISSN), DOI 10.1103/PhysRevE.92.052504
Примечания : Cited References: 92. - This work was supported in part by Russian Foundation for Basic Research Grants No. 14-02-31248 and No. 15-02-06924; Ministry of Education and Science of the Russian Federation under the Government program, Project No. 3.1276.2014/K; and the Ministry of Science and Technology of Taiwan under Grant No. NSC 103-2923-M-009-003-MY3 through an NSC–SB RAS joint project
Предметные рубрики: NEMATIC LIQUID-CRYSTAL
DIMENSIONAL PHOTONIC CRYSTAL
OPTICAL-PROPERTIES
ELECTROMAGNETIC PROPAGATION
DISPLAYS
SYSTEMS
FILTER
LIGHT
CELL
FORMULATION
Аннотация: Anomalous spectral shift of transmission peaks is observed in a Fabry-Pérot cavity filled with a chiral anisotropic medium. The effective refractive index value resides out of the interval between the ordinary and the extraordinary refractive indices. The spectral shift is explained by contribution of a geometric phase. The problem is solved analytically using the approximate Jones matrix method, numerically using the accurate Berreman method, and geometrically using the generalized Mauguin-Poincaré rolling cone method. The o-mode blueshift is measured for a 4-methoxybenzylidene-4′-n-butylaniline twisted-nematic layer inside the Fabry-Pérot cavity. The twist is electrically induced due to the homeoplanar-twisted configuration transition in an ionic-surfactant-doped liquid crystal layer. Experimental evidence confirms the validity of the theoretical model. © 2015 American Physical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Zyryanov V. Ya., Konkolovich A. V., Miskevich A. A.
Заглавие : Light transmission of polymer-dispersed liquid crystal layer composed of droplets with inhomogeneous surface anchoring
Место публикации : Opt. Spectrosc.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 120, Is. 1. - P.143-152. - ISSN 0030-400X, DOI 10.1134/S0030400X16010112. - ISSN 1562-6911(eISSN)
Примечания : Cited References:43. - This work was supported by the National Academy of Sciences of Belarus and the Siberian Branch of the Russian Academy of Sciences (project no. 36) and the Belarusian Republican Foundation for Fundamental Research (project no. F15SO-039).
Предметные рубрики: NEMATIC DROPLETS
IONIC MODIFICATION
FIELD
TRANSITIONS
SCATTERING
PARTICLES
INTERFACE
DISPLAYS
Аннотация: We have developed a model and realized an algorithm for the calculation of the coefficient of coherent (direct) transmission of light through a layer of liquid crystal (LC) droplets in a polymer matrix. The model is based on the Hulst anomalous diffraction approximation for describing the scattering by an individual particle and the Foldy-Twersky approximation for a coherent field. It allows one to investigate polymer dispersed LC (PDLC) materials with homogeneous and inhomogeneous interphase surface anchoring on the droplet surface. In order to calculate the configuration of the field of the local director in the droplet, the relaxation method of solving the problem of minimization of the free energy volume density has been used. We have verified the model by comparison with experiment under the inverse regime of the ionic modification of the LC-polymer interphase boundary. The model makes it possible to solve problems of optimization of the optical response of PDLC films in relation to their thickness and optical characteristics of the polymer matrix, sizes, polydispersity, concentration, and anisometry parameters of droplets. Based on this model, we have proposed a technique for estimating the size of LC droplets from the data on the dependence of the transmission coefficient on the applied voltage.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gardymova A. P., Zyryanov V. Y., Loiko V. A.
Заглавие : Multistability in polymer-dispersed cholesteric liquid crystal film doped with ionic surfactant
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 37, Is. 9. - P805-808. - ISSN 1063-7850, DOI 10.1134/S1063785011090094
Примечания : Cited References: 12. - This study was supported in part by the Federal Targeted Program "Scientific and Pedagogical Personnel for Innovative Russia" (project no. P901) and the Siberian Branch of the Russian Academy of Sciences (project nos. 110 and 144).
Предметные рубрики: REFLECTIVE DISPLAYS
Аннотация: A memory effect has been discovered in composite films based on a polymer containing dispersed cholesteric liquid crystal, which is related to the modification of the surface anchoring by an ionic surfactant under the action of an applied electric field. Parameters of electric signals are selected that ensure the switching of the composite film between some stable states with different levels of optical transmittance.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Krakhalev M. N., Miskevich A. A., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Development of scattering media optics methods to calculate optical properties of polymer dispersed liquid crystal films
Коллективы : EuroDisplay conference, Society for Information Displays, Institute of Physics
Место публикации : EuroDisplay 2017: Abstract book. - 2017. - P.27-28
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Кузьменок Н. М., Михалёнок С. Г., Орёл А. С., Безбородов В. С., Крахалев, Михаил Николаевич, Сутормин, Виталий Сергеевич, Прищепа, Оксана Олеговна, Зырянов, Виктор Яковлевич
Заглавие : Синтез и исследование анизотропных солей аммония для создания жидкокристаллических материалов и устройств с варьируемым поверхностным сцеплением
Место публикации : Жидк. кристаллы и их практич. использ. - 2018. - Т. 18, № 4. - С. 27-39. - ISSN 1991-3966, DOI 10.18083/LCAppl.2018.4.27; Liq. Cryst. Appl.
Примечания : Библиогр.: 13. - Работа выполнена частично при поддержке БРФФИ (грант № X16P-110) и РФФИ (грант № 16-53-00073).
Ключевые слова (''Своб.индексиров.''): жидкокристаллические материалы--ионные сурфактанты--амины--кватернизация--электрооптические устройства--дисплеи--liquid crystals--ionic surfactants--amines--quaternization--electro-optical devices--displays
Аннотация: Получены разнообразные анизотропные четвертичные соли аммония, характеризующиеся специфическим взаимодействием с границей раздела и способные к формированию различных ориентационных структур жидкокристаллического слоя. Показано, что данные соли перспективны для создания более совершенных ЖК-композиций с поверхностным сцеплением, обусловленным ионными сурфактантами, а результаты исследований представляют несомненный интерес для разработчиков новых жидкокристаллических материалов и электрооптических устройств на их основе.Various anisotropic quaternary ammonium salts characterized by a specific interaction with the interface and capable to form various orientational structures of liquid crystal layer, have been prepared. It has been shown that these salts are promising materials for creation of advanced LC compositions with surface anchoring caused by ionic surfactants. The obtained results are of undoubted interest for the developers of new liquid crystal materials and electro-optical devices based on them.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Timofeev I. V., Bikbaev R. G., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Polarization characteristics of light passed through a cholesteric layer with tangential-conical boundary conditions
Коллективы : EuroDisplay international conference, Society for Information Displays, Белорусский государственный университет информатики и радиоэлектроники
Место публикации : EuroDisplay 2019: book of abstracts of International conference. - 2019. - Ст.O-4. - P.20
Примечания : Cited References: 2
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Feyzer K. A., Sutormin V. S., Loiko V. A., Konkolovich A. V., Miskevich A. A., Zyryanov V. Ya.
Заглавие : Electro-optical response of PDLC films with conical boundary conditions
Коллективы : EuroDisplay international conference, Society for Information Displays, Белорусский государственный университет информатики и радиоэлектроники
Место публикации : EuroDisplay 2019: book of abstracts of International conference. - 2019. - Ст.O-31. - P.63
Примечания : Cited References: 3
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Loiko V. A., Zyryanov V. Ya., Konkolovich A. V., Miskevich A. A., Prishchepa O. O., Shabanov A. V., Krakhalev M. N.
Заглавие : Spectral dependences of transmittance and polarizing ability of stretched PDLC films with homogeneous and inhomogeneous interface anchoring
Коллективы : EuroDisplay international conference, Society for Information Displays, Белорусский государственный университет информатики и радиоэлектроники
Место публикации : EuroDisplay 2019: book of abstracts of International conference. - 2019. - Ст.O-9. - P.25
Примечания : Cited References: 2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou G., Ren Q., Molokeev M. S., Zhou Y., Zhang J., Zhang X. -M.
Заглавие : Unraveling the ultrafast self-assembly and photoluminescence in zero-dimensional Mn2+-based halides with narrow-band green emissions
Место публикации : ACS Appl. Electron. Mater. - 2021. - Vol. 3, Is. 9. - P.4144-4150. - ISSN 26376113 (ISSN), DOI 10.1021/acsaelm.1c00606
Примечания : Cited References: 37. - This work is supported by the Natural Science Foundation of China (no. 21871167) and the 1331 project of Shanxi Province and funded by RFBR according to the research project no. 19-52-80003
Аннотация: The discovery of narrow-band luminescent materials remains an immense challenge to optimize the performance of white light-emitting diodes (LEDs). So far, the zero-dimensional (0D) Mn2+-based halides with near-unity narrow-band emissions have emerged as a class of promising phosphors in solid-state displays, but the related large-scale synthesis strategies have not been proposed and evaluated. Herein, we report an in situ synthetic process of 0D Mn2+-based halides and utilize (C20H20P)2MnBr4 as a case to investigate the photoluminescence characteristics and the structural essence of ultrafast self-assembly. The bright green emission peak at 523 nm with a full width at half maximum of 48 nm for (C20H20P)2MnBr4 is attributed to the d–d transition (4T1–6A1) of tetrahedrally coordinated [MnBr4]2– centers, and the fabricated white LED device shows a wide color gamut of 103.7% National Television System Committee (NTSC) standard. Remarkably, the experimental and theoretical results indicate that there are hydrogen bonding of C–H···Br and weak van der Waals interactions between [C20H20P]+ and [MnBr4]2–, resulting in the root for the realization of ultrafast self-assembly in 0D Mn2+-based halides. This work reveals a feasible and general synthesis method for preparing 0D Mn2+-based halides, thereby providing a possibility for their industrial application in solid-state displays.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Qiao J., Zhou Y., Molokeev M. S., Zhang Q., Xia Z.
Заглавие : Narrow bandwidth luminescence in Sr2Li(Al,Ga)O4:Eu2+ by selective site occupancy engineering for high definition displays
Место публикации : Laser Photon. Rev. - 2021. - Vol. 15, Is. 11. - Ст.2100392. - ISSN 18638880 (ISSN), DOI 10.1002/lpor.202100392
Примечания : Cited References: 39. - J.Q. and Y.Z. contributed equally to this work. This research was supported by the National Natural Science Foundation of China (grant nos. 51972118 and 51961145101), International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), Guangzhou Science & Technology Project (202007020005), the State Key Laboratory of Luminescent Materials and Devices (Skllmd-2021-09), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01×137). This work is also funded by RFBR according to the research project no. 19-52-80003
Аннотация: It remains a critical challenge to develop narrow-band emitters for wide color gamut displays. Herein, it is designed by the selective site occupancy engineering and an unprecedented narrow-band green-emitting phosphor is prepared through chemical substitution. By introducing Ga3+ ions into Sr2LiAlO4:Eu2+ phosphor, the distribution of Eu2+ ions in Sr1 and Sr2 sites is effectively controlled, and only one type of luminescent centers Eu2+(Sr1) is remained in Sr2LiAl0.6Ga0.4O4:Eu2+ due to the compression effect of Sr2O8 polyhedra. Sr2LiAl0.6Ga0.4O4:Eu2+ phosphor presents an extremely narrow-band green emission centered at 512 nm with a full-width at half-maximum of only 40 nm. The wide color gamut (107% National Television System Committee) of the as-fabricated white liquid crystal displays and the vivid figures captured from the projector demonstrate the potential application of narrow-band emitter for wide-color gamut displays. This work provides the design principles of realizing narrow-band emission by selective site occupancy engineering and can set the stage for the exploring of Eu2+-activated phosphor for high definition displays.
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