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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 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 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) : Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Inverse mode of ion-surfactant method of director reorientation inside nematic droplets
Место публикации : Mol. Cryst. Liquid Cryst. - 2009. - Vol. 512, Is. 1. - P.1998-2003. - ISSN 1542-1406, DOI 10.1080/15421400903050814
Примечания : Cited Reference Count: 8. - Гранты: This work was partially supported by the grants Nos. NSh-3818.2008.3; 02.740.11.0220, and No. 08-03-01007 of RFBR, and Nos. 27.1; 110; 144 of SB RAS. M. Krakhalev acknowledges the financial support from K. I. Zamaraev MBN Foundation. O. Prishchepa acknowledges the financial support from Russian Science Support Foundation.Финансирующая организация: RFBR [NSh-3818.2008.3, 02.740.11.0220, 08-03-01007]; SB RAS [27.1; 110; 144]; Zamaraev MBN Foundation; Russian Science Support Foundation
Ключевые слова (''Своб.индексиров.''): electrically commanded surfaces--ion surfactant--nematic--polymer dispersed liquid crystals--surface anchoring--electrically commanded surfaces--ion surfactant--nematic--polymer dispersed liquid crystals--surface anchoring--applied voltages--crossed polarizers--director fields--director reorientation--droplet structure--electrically commanded surfaces--high concentration--homeotropic--initial state--ionic modification--liquid-crystal droplets--nematic droplets--nematic polymer--surface-active cations--surface-anchoring--trimethyl--ammonium compounds--cationic surfactants--crystals--drop formation--dyes--ionization of liquids--ions--liquid crystal displays--liquid crystals--liquids--nematic liquid crystals
Аннотация: Inverse mode of a novel electrooptical effect caused by the ionic modification of boundary conditions has been studied for liquid crystal droplets. We have considered the droplets of nematic 5CB doped with cationic surfactant cetyl-trimethyl-ammonium-bromide and dispersed in polyvinyl alcohol. In the initial state the surface anchoring was normal on the whole interface due to the high concentration of homeotropic surfactant. Applied voltage results in the purification of a section of the interface from the surface-active cations thereby restoring here a tangential anchoring and stimulating the significant transformation of droplet structure. At that three different types of director field distribution can be realized within the same droplet. The proper textures of the droplet both in the crossed polarizers and without analyzer are considered.
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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) : Ming H., Zhou Ya., Molokeev M. S., Zhang Ch., Huang L., Wang Yu., Sun H.-T., Song E., Zhang Q.
Заглавие : Machine-learning-driven discovery of Mn4+-doped red-emitting fluorides with short excited-state lifetime and high efficiency for mini light-emitting dIode displays
Колич.характеристики :11 с
Место публикации : ACS Mater. Lett. - 2024. - Vol. 6. - P.1790-1800. - ISSN 26394979 (eISSN), DOI 10.1021/acsmaterialslett.4c00263
Примечания : Cited References: 39. - This work was financially supported by the National Key Research and Development Program of China (No. 2022YFB3503800), National Natural Science Foundation of China (Grants Nos. 52202170 and 52322208), Natural Science Foundation of Guangdong Province (No. 2022A1515140032) and Distinguished Youth Foundation of Guangdong Scientific Committee (No. 2023B1515020059). This work was also supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center’s Project No. 89-DON (3). H. Ming acknowledges the fellowship support from the China Scholarship Council (CSC No. 202206150038)
Аннотация: The discovery of high-efficiency Mn4+-activated fluoride red phosphors with short excited-state lifetimes (ESLs) is urgent and crucial for high-quality, wide-color-gamut display applications. However, it is still a great challenge to design target phosphors with both short ESL and high luminescence efficiency. Herein, we propose an efficient machine learning approach based on a small dataset to establish the ESL prediction model, thereby facilitating the discovery of new Mn4+-activated fluorides with short ESLs. Such a model can not only accurately predict the ESLs of Mn4+ in fluorides but also quantify the impact of structure features on ESLs, therefore elucidating the “structure-lifetime” correlations. Guided by the correlations, two new Mn4+-doped tetramethylammonium (TMA)-based hybrid fluorides (TMA)2BF6:Mn4+ (B = Sn or Hf) with both short ESLs (τ ≤ 3.7 ms) and high quantum efficiencies (internal QEs ˃ 92%, external QEs ˃ 55%) have been discovered successfully. A prototype displayer with excellent performance (∼124% National Television Standards Committee (NTSC) color gamut) is assembled by employing a (TMA)2SnF6:Mn4+-based white Mini-LED backlight module, demonstrating its practical prospects in high-quality displays. This work not only brings promising candidates for Mn4+-doped fluoride phosphors but also provides a valuable reference for accelerating the discovery of new promising phosphors.
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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 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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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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10.

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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