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Geometric phase and ο-mode blueshift in a chiral anisotropic medium inside a Fabry-Pérot cavity / I. V. Timofeev [et al.] // Phys. Rev. E. - 2015. - Vol. 92, Is. 5. - Ст. 052504, DOI 10.1103/PhysRevE.92.052504. - 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 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
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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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Imaging and Biomedical Photonics, College of Photonics, National Chiao Tung University, Guiren District, Tainan, Taiwan

Доп.точки доступа:
Timofeev, I. V.; Тимофеев, Иван Владимирович; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Lee, W.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
Свободных экз. нет}
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Light transmission of polymer-dispersed liquid crystal layer composed of droplets with inhomogeneous surface anchoring / V. A. Loiko [et al.] // Opt. Spectrosc. - 2016. - Vol. 120, Is. 1. - P. 143-152, DOI 10.1134/S0030400X16010112. - 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). . - ISSN 0030-400X. - ISSN 1562-6911

РУБ Optics + Spectroscopy
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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Публикация на русском языке Пропускание света слоем капсулированного полимером жидкого кристалла при неоднородном сцеплении на поверхности капель [Текст] / В. А. Лойко [и др.] // Оптика и спектроскопия : Наука, 2016. - Т. 120 № 1. - С. 158-168

Держатели документа:
Natl Acad Sci Belarus, Stepanov Inst Phys, Minsk 220072, Byelarus.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Loiko, V. A.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Konkolovich, A. V.; Miskevich, A. A.
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Gardymova, A. P.
Multistability in polymer-dispersed cholesteric liquid crystal film doped with ionic surfactant / A. P. Gardymova, V. Y. Zyryanov, V. A. Loiko // Tech. Phys. Lett. - 2011. - Vol. 37, Is. 9. - P. 805-808, DOI 10.1134/S1063785011090094. - 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). . - ISSN 1063-7850

РУБ Physics, Applied
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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Держатели документа:
[Gardymova, A. P.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Siberian Branch, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Natl Acad Sci Belarus, BI Stepanov Phys Inst, Minsk 220072, Byelarus
ИФ СО РАН
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus

Доп.точки доступа:
Zyryanov, V. Y.; Зырянов, Виктор Яковлевич; Loiko, V. A.
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Development of scattering media optics methods to calculate optical properties of polymer dispersed liquid crystal films / V. A. Loiko [et al.] // EuroDisplay 2017 : Abstract book. - 2017. - P. 27-28

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Доп.точки доступа:
Loiko, V. A.; Konkolovich, A. V.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Miskevich, A. A.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; EuroDisplay conference(2017 ; 31 Oct. - 2 Nov. ; Berlin, Germany); Society for Information Displays; Institute of Physics
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    Синтез и исследование анизотропных солей аммония для создания жидкокристаллических материалов и устройств с варьируемым поверхностным сцеплением / Н. М. Кузьменок [и др.] // Жидк. кристаллы и их практич. использ. - 2018. - Т. 18, № 4. - С. 27-39 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2018.4.27. - Библиогр.: 13. - Работа выполнена частично при поддержке БРФФИ (грант № X16P-110) и РФФИ (грант № 16-53-00073). . - ISSN 1991-3966
   Перевод заглавия: Synthesis and study of anisotropic ammonium salts for production of liquid-crystalline materials and devices with variable surface anchoring
Кл.слова (ненормированные):
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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Держатели документа:
Белорусский государственный технологический университет, ул. Свердлова, д. 13-а, 220006 Минск, Беларусь
Институт физики им. Л. В. Киренского Сибирского отделения Российской академии наук – обособленное подразделение Федерального исследовательского центра «Красноярский научный центр СО РАН», Академгородок, д. 50, 660036 Красноярск, Россия
Сибирский федеральный университет, пр. Свободный, д. 79, 660041 Красноярск, Россия

Доп.точки доступа:
Кузьменок, Н. М.; Михалёнок, С. Г.; Орёл, А. С.; Безбородов, В. С.; Крахалев, Михаил Николаевич; Krakhalev, M. N.; Сутормин, Виталий Сергеевич; Sutormin, V. S.; Прищепа, Оксана Олеговна; Prishchepa, O. O.; Зырянов, Виктор Яковлевич; Zyryanov, V. Ya.

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Polarization characteristics of light passed through a cholesteric layer with tangential-conical boundary conditions / V. S. Sutormin [et al.] // EuroDisplay 2019 : book of abstracts of International conference. - 2019. - Ст. O-4. - P. 20. - Cited References: 2

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Доп.точки доступа:
Sutormin, V. S.; Сутормин, Виталий Сергеевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; EuroDisplay international conference(2019 ; Sept. ; 16-20 ; Minsk, Belarus); Society for Information Displays; Белорусский государственный университет информатики и радиоэлектроники
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Electro-optical response of PDLC films with conical boundary conditions / M. N. Krakhalev [et al.] // EuroDisplay 2019 : book of abstracts of International conference. - 2019. - Ст. O-31. - P. 63. - Cited References: 3

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Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Feyzer, K. A.; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Loiko, V. A.; Лойко В. А.; Konkolovich, A. V.; Конколович А. В. ; Miskevich, A. A.; Мискевич А. А.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; EuroDisplay international conference(2019 ; Sept. ; 16-20 ; Minsk, Belarus); Society for Information Displays; Белорусский государственный университет информатики и радиоэлектроники
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Spectral dependences of transmittance and polarizing ability of stretched PDLC films with homogeneous and inhomogeneous interface anchoring / M. N. Krakhalev [et al.] // EuroDisplay 2019 : book of abstracts of International conference. - 2019. - Ст. O-9. - P. 25. - Cited References: 2

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Доп.точки доступа:
Loiko, V. A.; Лойко В. А.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Konkolovich, A. V.; Конколович А. В. ; Miskevich, A. A.; Мискевич А. А.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; EuroDisplay international conference(2019 ; Sept. ; 16-20 ; Minsk, Belarus); Society for Information Displays; Белорусский государственный университет информатики и радиоэлектроники
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    Unraveling the ultrafast self-assembly and photoluminescence in zero-dimensional Mn2+-based halides with narrow-band green emissions / G. Zhou, Q. Ren, M. S. Molokeev [et al.] // ACS Appl. Electron. Mater. - 2021. - Vol. 3, Is. 9. - P. 4144-4150, DOI 10.1021/acsaelm.1c00606. - 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 . - ISSN 2637-6113
   Перевод заглавия: Открытие сверхбыстрой самосборки и фотолюминесценции в галогенидах на основе Mn2+ с нулевой размерностью и узкополосной зеленой эмиссией
Кл.слова (ненормированные):
zero-dimensional Mn2+-based halides -- ultrafast self-assembly -- photoluminescence -- white LEDs -- solid-state displays
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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Держатели документа:
Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Linfen, 041004, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
State Key Lab. of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China
Coll. of Chem. and Chem. Eng., Key Lab. of Interface Sci. and Eng. in Adv. Mat., Min. of Education, Taiyuan University of Technology, Shanxi, Taiyuan, 030024, China

Доп.точки доступа:
Zhou, G.; Ren, Q.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhou, Y.; Zhang, J.; Zhang, X. -M.
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10.

    Narrow bandwidth luminescence in Sr2Li(Al,Ga)O4:Eu2+ by selective site occupancy engineering for high definition displays / J. Qiao, Y. Zhou, M. S. Molokeev [et al.] // Laser Photon. Rev. - 2021. - Vol. 15, Is. 11. - Ст. 2100392, DOI 10.1002/lpor.202100392. - 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 . - ISSN 1863-8880
   Перевод заглавия: Узкополосная люминесценция в Sr2Li (Al, Ga) O4: Eu2+, полученная с помощью выборочной заселенности позиций в кристалле, для дисплеев высокой четкости
Кл.слова (ненормированные):
chemical substitution -- green-emitting phosphor -- narrow-band emission -- site engineering
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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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Laboratory of Crystal Physics, Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Department of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China

Доп.точки доступа:
Qiao, J.; Zhou, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, Q.; Xia, Z.
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11.

Inverse mode of ion-surfactant method of director reorientation inside nematic droplets / M. N. Krakhalev, O. O. Prishchepa, V. Y. Zyryanov // Mol. Cryst. Liquid Cryst. - 2009. - Vol. 512, Is. 1. - P. 1998-2003, DOI 10.1080/15421400903050814. - 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 . - ISSN 1542-1406
Кл.слова (ненормированные):
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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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia
Siberian Fed Univ, Krasnoyarsk, Russia

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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12.

    Strategy to construct high thermal-stability narrow-band green-emitting Si-CDs@MAs phosphor for wide-color-gamut backlight displays / J. Chen, X. Zou, W. Li [et al.] // Adv. Opt. Mater. - 2022. - Vol. 10, Is. 21. - Ст. 2200851, DOI 10.1002/adom.202200851. - Cited References: 47. - The work was supported by the Ministry of Science and Technology of China (No. G2021030022L), the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2021KJ122), the National Natural Science Foundations of China (No. 52102042), the Independent Research and Development Projects of Maoming Laboratory (No. 2021ZZ004), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangzhou Science & Technology Project (Nos. 202007020005 and 202103000059), the Guangdong Provincial Science and Technology Project (Nos. 2021A0505050006 and 2022A1515010229), and the Project of GDUPS (2018) for B.L. . - ISSN 2195-1071
   Перевод заглавия: Стратегия создания узкополосного люминофора Si-CD@MAs с высокой термостабильностью, излучающего зеленый свет, для дисплеев с подсветкой с широкой цветовой гаммой
Кл.слова (ненормированные):
carbon dots -- low thermal quenching -- narrowband -- photoluminescence -- WLED backlights
Аннотация: Developing innovative narrow-band green-emitting phosphors featuring low thermal quenching and eco-friendliness for white light-emitting diode (WLED) backlights is a pivotal challenge. Benefitting from narrowband and low toxicity of green-emitting silanized carbon dots (Si-CDs), an efficient confinement and protection strategy through embedding Si-CDs in mesoporous aluminas (MAs) is proposed to construct MAs and Si-CDs composites (Si-CDs@MAs) with superior luminescence properties. Si-CDs@MAs phosphor exhibits green emission at 526 nm with narrow full width at half maximum of 51 nm, zero-thermal quenching even up to 423 K (104.1%@423 K of the emission peak intensity at 298 K), and the internal quantum efficiency of 64.46%. Compared with broad-band yellow-emitting solid-state Si-CDs (S-Si-CDs), the thermal stability, photostability, and water stability of Si-CDs@MAs phosphor are remarkably improved due to surface protection. The WLED backlight is fabricated with optimized Si-CDs@MAs phosphor, which shows high luminous efficacy of 117.43 lm W?1 and wide color gamut (107% NTSC). Furthermore, this work provides the design principles of realizing stable narrow-band solid-state fluorescence carbon dots, suggesting its great potential for wide-color-gamut display application.

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Держатели документа:
Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, Maoming, 525100, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences (SB RAS), Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Chen, J.; Zou, X.; Li, W.; Zhang, H.; Zhang, X.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Y.; Lei, B.
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13.

    Structure-based machine learning enables discovery of Mn4+-activated red-light fluorides for ultrawide-gamut mini-light-emitting diodes / Yu. Wang, W. Tang, Ch. Zhang [et al.] // Adv. Funct. Mater. - 2024. - Vol. 34, Is. 14. - Ст. 2313490, DOI 10.1002/adfm.202313490. - Cited References: 61. - This research was financially supported by the National Key R& D Program of China (Grant No. 2022YFB3503800) and the National Natural Science Foundation of China (Grant Nos. 52202170 and 52322208). This research was supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center's project No. 89-DON (3) . - ISSN 1616-301X. - ISSN 1616-3028
   Перевод заглавия: Структурное машинное обучение позволяет обнаружить Mn4+-активированные фториды красного света для мини-светодиодов со сверхширокой гаммой
Кл.слова (ненормированные):
fluorides -- mini-light-emitting diodes -- Mn4+ -- red light -- wide-gamut displays
Аннотация: Mn4+-activated fluorides with a saturated red color and sharp line emission are ideal for applications in the light-emitting diodes (LEDs) backlight for displays. However, the emissions attributed to 2E→4A2 parity and spin-forbidden transitions limit the design and adjustments of emission wavelength and chromaticity coordinates. Herein, machine learning algorithms are used to build a wavelength-prediction model for Mn4+-activated fluorides. The model precisely identifies the key structural features that affect wavelengths and discovers target materials. The predicted candidate Cs2NaAlF6:Mn4+ (CNAF) with a long-wavelength zero-phonon-line emission at 628 nm exhibits a redshift in comparison with other reported Mn4+-activated fluorides and commercial K2SiF6:Mn4+, but maintains narrow spectral emission with full-width half maximum (FWHM) of 11.2 nm. The redshift and narrow spectra result in a color purity of 99.7% and Commission Internationale de L'Eclairage (CIE) chromaticity coordinate of (0.7032,0.2967) that is close to the pure red-light point of Recommendation BT. 2020 (Rec. 2020). Moreover, CNAF is prepared as a transparent red-light film, and the device fabricated using the blue-light mini-LEDs, green quantum-dot film, and CNAF film exhibits a wide color-gamut of 121.5% National Television Standards Committee (NTSC) or 90.6% Rec. 2020, suggesting that CNAF has potential for wide-color-gamut displays.

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Держатели документа:
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, P. R. China
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk 660041, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen 625003, Russia
Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology, School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528225, China

Доп.точки доступа:
Wang, Yuanjing; Tang, Wenyu; Zhang, Chuang; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ming, Hong; Zhou, Yayun; Peng, Shuai; Song, Enhai; Zhang, Qinyuan
}
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14.

    Machine-learning-driven discovery of Mn4+-doped red-emitting fluorides with short excited-state lifetime and high efficiency for mini light-emitting dIode displays / H. Ming, Ya. Zhou, M. S. Molokeev [et al.] // ACS Mater. Lett. - 2024. - Vol. 6. - P. 1790-1800, DOI 10.1021/acsmaterialslett.4c00263. - 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) . - ISSN 2639-4979
   Перевод заглавия: Открытие на основе машинного обучения фторидов красного излучения, легированных Mn4+, с коротким временем жизни в возбужденном состоянии и высокой эффективностью для мини-светодиодных дисплеев
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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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, and Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510641, China
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen 625003, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk 660041, Russia
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China
Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials and College of Materials, Xiamen University, Xiamen 361005, China
Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology, School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528225, China

Доп.точки доступа:
Ming, H.; Zhou, Ya.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, Ch.; Huang, L.; Wang, Yu.; Sun, H.-T.; Song, E.; Zhang, Q.
}
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