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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Вальков, Валерий Владимирович, Мицкан, Виталий Александрович, Шустин, Максим Сергеевич
Заглавие : Майорановские моды в квантовых проволоках конечной длины с электронными корреляциями
Коллективы : Институт физики металлов Уральского отделения РАН, Уральская международная зимняя школа по физике полупроводников
Место публикации : Урал. междунар. зимняя шк. по физике полупроводников: 19 – 24 февраля 2018 г. : гопрограмма и тезисы докладов/ чл. прогр. ком. В. В. Вальков. - 2018. - Секция 6: Электронные свойства низкоразмерных систем. - Ст.L-53. - С. 168
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu Y., Jiang X., Molokeev M. S., Zhang X., Lin Z.
Заглавие : Zn3GaB6O12As and Zn4P6N12S: Isotropic zero thermal expansion materials based on the "cage-restricting" model
Место публикации : Chem. Mater. - 2022. - Vol. 34, Is. 22. - P.9915-9922. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.2c01947
Примечания : Cited References: 41. - This work was supported by the National Scientific Foundation of China (grant nos 12274425, 51872297, 11974360, and 51890864) and Fujian Institute of Innovation (FJCXY18010201) in CAS. X.X.J. acknowledges the support from Youth Talent Promotion Project from China Association for Science and Technology and the CAS Project for Young Scientists in Basic Research (grant YSBR-024)
Аннотация: With the capability to keep the size invariant along all dimensions over a certain temperature range, isotropic zero thermal expansion (ZTE) materials have been attracting wide interest in many scientific and engineering fields. Herein, based on the “cage-restricting” model for the ZTE materials with β-sodalite-like structures, we design and synthesize two new isotropic ZTE materials, Zn3GaB6O12As (ZGBA) and Zn4P6N12S (ZPNS), from the molecular engineering strategies of enhancing the cage-restricting force and of increasing the rigidity of β-sodalite cages, respectively. ZGBA and ZPNS exhibit isotropic ZTE behaviors in the temperature range from 20 to 300 K, with the coefficients of thermal expansion 1.18(17)/MK and 1.37(17)/MK, respectively, both of which are lowered by ∼30–20% in comparison with their template compound Zn4B6O12S (ZBS). The mechanisms of improved isotropic ZTE in ZGBA and ZPNS are unraveled by lattice dynamic analysis and temperature-dependent crystal structure evolution. This study paves new avenues to enhance the ZTE behavior in the materials with cage-like structures and has great implication on the exploration of isotropic ZTE materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen K., Gao P., Zhang Z., Ma Y., Luo Z., Molokeev M. S., Zhou Zh., Xia M.
Заглавие : Zero-thermal-quenching broadband yellow-emitting Bi3+-activated phosphors based on metal to metal charge transfer
Колич.характеристики :9 с
Место публикации : J. Alloys Compd. - 2024. - Vol. 986. - Ст.174112. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2024.174112. - ISSN 18734669 (eISSN)
Примечания : Cited References: 52. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 51974123), the Key R & D Projects in Hunan Province (2021SK2047 and 2022NK2044), the Wangcheng Science and Technology Plan (KJ221017) and the Science and Technology Innovation Program of Hunan Province (2022WZ1022). The work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of World-class Research Center program: "Advanced Digital Technologies", contract no. 075-15-2020-935. Superior Youth Project of the Science Research Project of Hunan Provincial Department of Education (22B0211)
Аннотация: Bi3+-activated phosphors have been proven to have potential applications foreground in white light-emitting diodes (WLED), plant growth lamps and temperature sensing. Therefore, it is urgent to exploit high-efficiency Bi3+-activated phosphors. Herein, a novel broadband yellow-emitting phosphor Ba2GdGaO5:Bi3+ with high internal quantum efficiency (IQE = 77%) was obtained based on metal to metal charge transfer (MMCT) between Bi3+ ground state and Gd3+ excited states. The photoluminescence excitation (PLE) spectrum and photoluminescence (PL) spectrum range from 225 nm to 400 nm and 400 nm to 700 nm, respectively, which can avoid the reabsorption phenomenon efficiently. Besides, Ba2GdGaO5:Bi3+ has superior thermal stability and it shows zero-thermal-quenching at 150 °C. The K+ doping hardly changes the thermal stability and can improve the PL intensity to 133.1% when the K+ concentration is 2%. Finally, a phosphor-convert WLED (pc-WLED) was simply synthesized by Ba2GdGaO5:Bi3+ and BaMgAl10O17:Eu2+ (BAM:Eu2+) phosphors. The doping of Eu3+ can significantly enhance the color rendering index (CRI, from 88.1 to 91.5) and reduce the correlated color temperature (CCT, from 4911 K to 4014 K). The above experimental results demonstrated that the phosphor has great application prospect in WLED.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su B., Jin J., Peng Y., Molokeev M. S., Yang X., Xia Z.
Заглавие : Zero-Dimensional Organic Copper(I) Iodide Hybrid with High Anti-Water Stability for Blue-Light-Excitable Solid-State Lighting
Место публикации : Adv. Opt. Mater. - 2022. - Vol. 10, Is. 12. - Ст.2102619. - ISSN 21951071 (ISSN), DOI 10.1002/adom.202102619
Примечания : Cited References: 55. - This work was supported by the National Natural Science Foundation of China (Nos.: 51961145101 and 51972118), Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2017BT01×137). This work was also funded by RFBR according to the research Project No.19-52-80003
Аннотация: The discovery of rare-earth free luminescent materials with blue-light-excitable characteristic is of great importance for solid-sate lighting applications. Herein, a Cu(I)-based 0D luminescent hybrid (1,3-dppH2)2Cu4I8∙H2O is synthesized by a facile solution method, and it shows the orange-red emission peaking at 625 nm upon 460 nm excitation. The structure-related luminescence mechanism has been elaborated by experimental and theoretical investigations. Moreover, the emission intensity remains unchanged even after continuous water treatment for 60 days due to the improved structural stability originating from intermolecular π–π interaction between organic cations. A warm white light-emitting diode (LED) device with the color rendering index of 91.4% has been fabricated by combining the 440 nm LED chip, green-emitting Lu3Al5O12:Ce3+, and (1,3-dppH2)2Cu4I8∙H2O. This work provides a new design route towards 0D cuprous halide materials and will initiate more exploration of their intrinsic luminescence mechanism.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang, Xingxing, Yang, Y.i., Molokeev M. S., Gong, Pifu, Liang, Fei, Wang, Shuaihua, Liu, Lei, Wu, Xiang, Li, Xiaodong, Li, Yanchun, Wu, Shaofan, Li, Wei, Wu, Yicheng, Lin, Zheshuai
Заглавие : Zero linear compressibility in nondense borates with a "Lu-Ban stool"-like structure
Место публикации : Adv. Mater. - 2018. - Vol. 30, Is. 32. - Ст.1801313. - ISSN 0935-9648, DOI 10.1002/adma.201801313. - ISSN 1521-4095(eISSN)
Примечания : Cited References: 28. - X.J., Y.Y., and M.M. contributed equally to this work. The authors acknowledge Zhuohong Yin for useful discussions. This work was supported by the National Scientific Foundations of China (Grant Nos. 11474292, 51702330, 11611530680, 91622118, and 91622124), Russian Foundation for Basic Research (Grant No. 17-52-53031), the Special Foundation of the Director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (No. 2015AA034203), key project of Beijing Synchrotron Radiation Facility and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and Grant No. 2017035 for X.J.).
Предметные рубрики: MECHANICAL METAMATERIALS
PRESSURE
METABORATE
STRENGTH
Ключевые слова (''Своб.индексиров.''): borates--"lu-ban stool"-like structure--ultraviolet transparency--zero--linear compressibility
Аннотация: Discovering materials that exhibit zero linear compressibility (ZLC) behavior under hydrostatic pressure is extremely difficult. To date, only a handful of ZLC materials have been found, and almost all of them are ultrahard materials with densified structures. Here, to explore ZLC in nondense materials, a structural model analogous to the structure of the “Lu‐Ban stool,” a product of traditional Chinese woodworking invented 2500 years ago, is proposed. The application of this model to borates leads to the discovery of ZLC in AEB2O4 (AE = Ca and Sr) with the unique “Lu‐Ban stool”‐like structure, which can obtain a subtle mechanical balance between pressure‐induced expansion and contraction effects. Coupled with the very wide ultraviolet transparent windows, the ZLC behavior of AEB2O4 may result in some unique but important applications. The applications of the “Lu‐Ban stool” model open a new route for pursuing ZLC materials in nondense structural systems.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mao Y., Zhang J., Ren Q., Molokeev M. S., Zhou G., Zhang X. -M.
Заглавие : Unveiling the uncommon blue-excitable broadband yellow emission from self-trapped excitons in a zero-dimensional hybrid tellurium-based double perovskite
Место публикации : J. Mater. Chem. C. - 2022. - Vol. 10, Is. 46. - P.17638-17645. - ISSN 20507526 (ISSN), DOI 10.1039/d2tc03150g. - ISSN 20507534 (eISSN)
Примечания : Cited References: 56. - This work was supported by the Natural Science Foundation of Shanxi Province (No. 20210302124054), the National Natural Science Foundation of China (No. 21871167), the Science and Technology Innovation Project of Colleges and Universities in Shanxi Province (No. 2021L262), the 1331 Project of Shanxi Province and the Postgraduate Innovation Project of Shanxi Normal University (No. 2021XSY040), and funded by RFBR according to the research project no. 19-52-80003
Аннотация: Low-dimensional metal halides with ns2 lone-pair electrons have been recognized as new generation luminescent emitters for various optoelectronic applications. However, 5s2 configuration tellurium halides have not received substantial attention despite their fascinating photoluminescence (PL) properties. Here, a hybrid tellurium-based double perovskite of (C20H20P)2TeCl6 is developed, in which the [TeCl6]2− octahedra are completely surrounded by [C20H20P]+ organic cations to form a unique zero-dimensional (0D) “host–guest” structure. An uncommon broadband yellow emission peaking at 570 nm with ultra-broad excitation from ultraviolet to blue light is excavated, which originates from the triplet self-trapped exciton (STE) emission of Te4+. Moreover, the 5s2 electronic transition mechanism of Te4+ is systematically revealed in depth, benefiting from the temperature-dependent fluorescence dynamic analysis and auxiliary theoretical calculations. It is concluded that the distortion degree of the [TeCl6]2− octahedron comprehensively affects the full width at half-maximum (FWHM) (positive correlation), Stokes shift (negative correlation) and PL intensity (negative correlation) with increasing temperatures. This work sheds new light on the PL behaviour of Te4+ and opens up a feasible avenue for blue-excitable broadband emissions in low-dimensional organic–inorganic hybrid double perovskites.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou, Guojun, Liu, Zhiyang, Huang, Jinglong, Molokeev M. S., Xiao, Zewen, Ma, Chonggeng, Xia, Zhiguo
Заглавие : Unraveling the near-unity narrow-band green emission in zero-dimensional Mn2+-based metal halides: a case study of (C10H16N)2Zn1–xMnxBr4 solid solutions
Место публикации : J. Phys. Chem. Lett. - 2020. - Vol. 11, Is. 15. - P.5956-5962. - ISSN 1948-7185, DOI 10.1021/acs.jpclett.0c01933
Примечания : Cited References: 32. - This work was supported by the National Natural Science Foundations of China (Grant No. 51972118, 51961145101, and 51722202), Fundamental Research Funds for the Central Universities (D2190980), Guangzhou Science & Technology Project (202007020005), the Guangdong Provincial Science & Technology Project (No. 2018A050506004), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to the research project No. 19-5280003. C. Ma acknowledges the support from the Innovation and Entrepreneurship Programs for Returned Overseas Chinese Scholars offered by Chongqing Bureau of Human Resources and Social Security (CX2019055). Z. Xiao acknowledges the financial support from the Thousand Young Talents Program of China, the Startup Fund of Huazhong University of Science and Technology, and the Director Fund of Wuhan National Laboratory for Optoelectronics
Предметные рубрики: Organic-inorganic hybrid
Light emission
White
Br
Аннотация: Zero-dimensional (0D) Mn2+-based metal halides are potential candidates as narrow-band green emitters, and thus it is critical to provide a structural understanding of the photophysical process. Herein, we propose that a sufficiently long Mn–Mn distance in 0D metal halides enables all Mn2+ centers to emit spontaneously, thereby leading to near-unity photoluminescence quantum yield. Taking lead-free (C10H16N)2Zn1–xMnxBr4 (x = 0–1) solid solution as an example, the Zn/Mn alloying inhibits the concentration quenching that is caused by the energy transfer of Mn2+. (C10H16N)2MnBr4 exhibits highly thermal stable luminescence even up to 150 °C with a narrow-band green emission at 518 nm and a full width at half maximum of 46 nm. The fabricated white light-emitting diode device shows a high luminous efficacy of 120 lm/W and a wide color gamut of 104% National Television System Committee standard, suggesting its potential for liquid crystal displays backlighting. These results provide a guidance for designing new narrow-band green emitters in Mn2+-based metal halides.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Vetrov S. Ya., Timofeev I. V.
Заглавие : Two types of localized states in a photonic crystal bounded by an epsilon near zero nanocomposite
Место публикации : Photonics. - 2018. - Vol. 5, Is. 3. - Ст.22. - ISSN 23046732 (ISSN), DOI 10.3390/photonics5030022
Примечания : Cited References: 53
Ключевые слова (''Своб.индексиров.''): photonic crystal--nanocomposite--epsilon near zero material--tamm plasmon polariton
Аннотация: The spectral properties of a one-dimensional photonic crystal bounded by a resonant absorbing nanocomposite layer with the near-zero permittivity have been studied. The problem of calculating the transmittance, reflectance, and absorptance spectra of such structures at the normal and oblique incidence of light has been solved. It is shown that, depending on the permittivity sign near zero, the nanocomposite is characterized by either metallic or dielectric properties. The possibility of simultaneous formation of the Tamm plasmon polariton at the photonic crystal/metallic nanocomposite interface and the localized state similar to the defect mode with the field intensity maximum inside the dielectric nanocomposite layer is demonstrated. Specific features of field localization at the Tamm plasmon polariton and defect mode frequencies are analyzed. © 2018 by the authors.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev, Nicolay N., Gerasimova, Marina A., Ostapenko, Ivan A., Zolotov, Andrey O., Molokeev M. S.
Заглавие : Two organic-inorganic manganese(II) halide hybrids containing protonated N,N’-dialkylthioureas with efficient green-emission
Место публикации : J. Mol. Struct. - 2023. - Vol. 1277. - Ст.134851. - ISSN 0022-2860 (ISSN), DOI 10.1016/j.molstruc.2022.134851
Примечания : Cited References: 42. - The reported study was funded by RFBR according to the research project № 19-52-80003. X-ray data from single crystals and powders were obtained with the analytical equipment of Krasnoyarsk Center of collective use of SB RAS
Аннотация: Luminescent (C5H13N2S)2[MnBr4] (1) and (C7H17N2S)2[MnBr4] (2) (C5H12N2S = N,N′-diethylthiourea, C7H16N2S = N,N′-diisopropylthiourea) were prepared via solvothermal method, and the structures of these compounds have been resolved using X-ray single crystal diffraction. The structures consist of electrostatically bound MnBr42− anions and organic C5H13N2S+ and C7H17N2S+ cations. The intermolecular N−H···Br and N−H···S hydrogen bonds additionally stabilize crystal structures of 1-2. Upon excitation over broadband covering the range 265 to 515 nm, these compounds show green emission peaking at 526 nm for 1 and 522 nm for 2, which is assigned to the 4T1→ 6A1 electronic transition of Mn2+ from isolated within the crystal structures MnBr42− tetrahedra. The photoluminescence quantum yield (PLQY) of powder 1 is 97 ± 7% for excitation at 440 nm and that of powder 2 is 83 ± 7% for excitation at 365 nm. The high PLQY indicates the absence of noticeable concentration quenching at shortest Mn···Mn distance of 8.11 and 8.73 Å between Mn2+ ions within the structures of 1 and 2. The high-performance photoluminescence of 0D (C5H13N2S)2[MnBr4] and (C7H17N2S)2[MnBr4] compounds demonstrated promising applications in photonics.
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