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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) : Val'kov V. V., Zlotnikov A. O., Shustin M. S.
Заглавие : The nontrivial ground state topology in the coexistence phase of chiral d-wave superconductivity and 120-degree magnetic order on a triangular lattice
Коллективы : Moscow International Symposium on Magnetism
Место публикации : J. Magn. Magn. Mater. - 2018. - Vol. 459. - P.112-117. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2017.11.115
Примечания : Cited References: 19. - This study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Region Science and Technology Support Fund according to the research projects No. 16-02-00073-a and 16-42-243069-mol-a. A.O.Z. is grateful for the support of the Grant of the President of the Russian Federation SP-1370.2015.5. The work of M.S.S. was supported by the Grant of the President of the Russian Federation MK-1398.2017.2.
Ключевые слова (''Своб.индексиров.''): majorana zero modes--topological invariant--chiral superconductivity--noncollinear magnetic order--triangular lattice
Аннотация: The Z2 topological invariant is defined in the chiral d-wave superconductor having a triangular lattice in the presence of the 120-degree magnetic ordering. Analyzing the Z2 invariant, we determine the conditions of implementing topological phases in the model with regard to superconducting pairings between the nearest and next nearest neighbors. It is often supposed in such a system that the pairing parameter between the nearest neighbors should be equal to zero due to the intersite Coulomb interaction. We show that taking into account even weak pairings in the first coordination sphere leads to the disappearance of the gapless excitations of the bulk spectrum in the wide region of the parameter space. Thus, topological invariants can be defined in this region. In solving the problem of open edges it is shown that the zero energy modes are realized basically in the topologically nontrivial phases. Such zero modes are topologically protected Majorana modes. A connection between the Z2 invariant and the integer topological invariant of the ground state of the 2D lattice is established in the presence of the electron-hole symmetry and noncollinear magnetic ordering.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Zlotnikov A. O., Shustin M. S.
Заглавие : The nontrivial ground state topology in the coexistence phase of chiral d-wave superconductivity and 120 degrees magnetic order on a triangular lattice [Electronic resource]
Место публикации : ArXiv. - 2017. - Ст.1707.04422
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 19. - This study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Kranoyarsk Region Science and Techonology Support Fund according to the research projects Nos. 16-02-00073-a (calculation of the topological invariant of a 2D lattice) and 16-42-243069-mol-a (calculation of the Z2 invariant). A.O.Z. is grateful for support of the Grant of the President of the Russian Feeration SP-1370.2015.5. The work of M.S.S. was supported by the Grant of the President of the Russian Federation MK-1398.2017.2.
Ключевые слова (''Своб.индексиров.''): majorana zero modes--topological invariant--chiral superconductivity--noncollinear magnetic order--triangular lattice
Аннотация: The Z2 topological invariant is defined in the chiral d-wave superconductor having a triangular lattice in the presence of the 120 degrees magnetic ordering. By analyzing the Z2 invariant, we determine the conditions of implementing nontrivial phases in the model with regard to superconducting pairings between nearest and next nearest neighbors. It is often supposed in such system that the pairing parameter between nearest neighbors should be equal to zero due to influence of the intersite Coulomb interaction. We show that taking into account even weak pairings in the first coordination sphere leads to the disappearance of the gapless excitations of the bulk spectrum in the wide region of the parameter space. Thus topological invariants can be defined in such region. Solving the problem of open edges it is shown that the zero energy modes are realized basically in the topologically nontrivial phases. Such zero modes are topologically protected Majorana modes. A connection between the Z2 invariant calculated at the symmetric points of the Brillouin zone with respect to the electron-hole symmetry and the integer topological invariant of the ground state of the 2D lattice expressed in terms of the Green functions is established in the presence of noncollinear magnetic ordering.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V.
Заглавие : Renormalization of triplet populations of a spin dimer in zero magnetic field with quantum transport
Коллективы : Ural International Winter School on the Physics of Semiconductors , Program for Fundamental Research of the Presidium of the Russian Academy of Sciences [32]; Russian Fund for Basic Research [16-02-00073, 18-32-00443]; Government of Krasnoyarsk Krai; Krasnoyarsk Regional Fund for Science [17-42-240441, 18-42-243017]; Russian Federation [MK-3722.2018.2]
Место публикации : Low Temp. Phys. - 2019. - Vol. 45, Is. 2: 22nd Ural International Winter School on the Physics of Semiconductors (Feb 20-23, 2018, Alapayevsk, RUSSIA). - P.165-175. - ISSN 1063-777X, DOI 10.1063/1.5086406. - ISSN 1090-6517(eISSN)
Примечания : Cited References: 20. - This work was performed with the support of the Program for Fundamental Research of the Presidium of the Russian Academy of Sciences, No. 32, "Nanostructures: physics, chemistry, biology, foundations of technology", the Russian Fund for Basic Research (grants #16-02-00073, #18-32-00443), the Government of Krasnoyarsk Krai, the Krasnoyarsk Regional Fund for Science within the scientific projects: "Connected Majorana fermions in nanomaterials with strong electron correlations and quantum transport of electrons in systems based on them" (No. 17-42-240441) and "Manifestation of Coulomb interactions and the effects of limited geometry in properties of topological regional states of nanostructures from spin-orbital interaction" (No. 18-42-243017). S.A. expresses his gratitude for a grant of the President of the Russian Federation MK-3722.2018.2.
Предметные рубрики: SINGLE-MOLECULE
Аннотация: Based on the nonequilibrium Keldysh technique in the atomic representation, the effect of inducing a varied population of magnetic states of a spin dimer interacting with electrons transported through a system in a zero magnetic field was studied. In order to find the filling numbers of the quantum states of the system under the strong nonequilibrium condition, a system of kinetic equations was derived and solved by the method of nonequilibrium diagram technique for Hubbard operators. Numerical analysis of these equations made it possible to reveal nonequilibrium renormalizations when accounting for strong spin-fermion correlations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Mitskan V. A., Shustin M. S.
Заглавие : Cascade of quantum transitions and magnetocaloric anomalies in an open nanowire
Коллективы : Russian Foundation for Basic Research; Krasnoyarsk Territorial Foundation of RD Activities [16-42-243056r, 16-42-243057, 17-42-240441]; Russian Foundation for Basic Research [16-02-00073]; Government of the Krasnoyarsk Territory
Место публикации : JETP Letters. - 2017. - Vol. 106, Is. 12. - P.798-804. - ISSN 0021-3640, DOI 10.1134/S0021364017240134. - ISSN 1090-6487(eISSN)
Примечания : Cited References:32. - We are grateful to A.D. Fedoseev and A.O. Zlotnikov for the useful comments and discussions of the results. This work was supported jointly by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for the Support of R&D Activities (project nos. 16-42-243056r, 16-42-243057, and 17-42-240441), as well as by the Russian Foundation for Basic Research (project no. 16-02-00073).
Предметные рубрики: MAJORANA FERMIONS
ZERO MODES
SUPERCONDUCTOR
Аннотация: A sequence of magnetocaloric anomalies occurring with the change in a magnetic field H is predicted for an open nanowire with the Rashba spin–orbit coupling and the induced superconducting pairing potential. The nature of such anomalies is due to the cascade of quantum transitions related to the successive changes in the fermion parity of the nanowire ground state with the growth of the magnetic field. It is shown that the critical Hc values fall within the parameter range corresponding to the nontrivial values of the Z2 topological invariant of the corresponding 1D band Hamiltonian characteristic of the D symmetry class. It is demonstrated that such features in the behavior of the open nanowire are retained even in the presence of Coulomb interactions.
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10.

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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11.

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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12.

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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13.

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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou, Jun, Li, Mingze, Molokeev M. S., Sun, Jiayue, Xu, Denghui, Xia, Zhiguo
Заглавие : Tunable photoluminescence in Sb3+-doped zero-dimensional hybrid metal halides with intrinsic and extrinsic self-trapped excitons
Место публикации : J. Mater. Chem. C. - 2020. - Vol. 8, Is. 15. - P.5058-5063. - ISSN 2050-7526, DOI 10.1039/d0tc00391c. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 33. - This work is supported by the National Natural Science Foundation of China (No. 51722202, 51961145101, 51972118, 21576002 and 61705003), Fundamental Research Funds for the Central Universities (D2190980), the Guangdong Provincial Science & Technology Project (2018A050506004), and Beijing Technology and Business University Research Team Construction Project (No. PXM2019_014213_000007). This work was also funded by RFBR according to the Research Project No. 19-52-80003.
Предметные рубрики: WHITE-LIGHT EMISSION
LUMINESCENCE
PEROVSKITES
CS2NASCCL6
CS2NAYCL6
Аннотация: Dopants in luminescent metal halides provide an alternative way for photoluminescence tuning towards versatile optical applications. Here we report a trivalent antimony (Sb3+)-doped single crystalline 0D metal halide with the composition of (C9NH20)9[Pb3Cl11](ZnCl4)2:Sb3+. This compound possessed the coexistence of two emission centers including intrinsic and extrinsic self-trapped excitons (STEs), which are ascribed to [Pb3Cl11]5− clusters and triplet STEs formed by the 3P1–1S0 transition of Sb3+. By regulating the Sb3+ concentration, the emission can be tuned from green to yellow and finally to orange, which would help to develop optically pumped white light-emitting diodes (WLEDs) with different photometric characteristics. Moreover, this dopant-induced extrinsic STE approach presents a new direction towards tuning the luminescence properties of 0D metal halides, and may find application in environmentally-friendly, high-performance metal halide light emitters.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ren Q., Zhang J., Molokeev M. S., Zhou G., Zhang X. -M.
Заглавие : Triplet-triplet energy transfer from Bi3+to Sb3+in zero-dimensional indium hybrids via a B-site co-doping strategy toward white-light emission
Место публикации : Inorg. Chem. Front. - 2022. - Vol. 9, Is. 22. - P.5960-5968. - ISSN 20521553 (ISSN), DOI 10.1039/d2qi01631a
Примечания : Cited References: 60. - 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 have emerged as promising platforms for the development of new-generation phosphor-converted light emitting diodes (pc-LEDs), in which zero-dimensional (0D) hybrids with lone-pair ns2 states, in particular, show unprecedented competitiveness owing to their fascinating photoluminescence (PL) properties. Herein, we designed a novel 0D indium hybrid, (C20H20P)2InCl5, and proposed a co-doping strategy to incorporate Bi3+ (6s2) and Sb3+ (5s2) ions into this indium hybrid. Widely tunable emissions from blue to red are achieved, which are assigned to the triplet self-trapped excitons (STEs) (3P1 → 1S0) of Bi3+ (476 nm) and Sb3+ (658 nm), respectively. Importantly, an uncommon triplet–triplet energy transfer from Bi3+ to Sb3+ contributes to tunable dual emissions, and enables a single-phase cool white-light emission under ultraviolet (UV) excitation. Moreover, the energy transfer mechanism is discussed clearly by fluorescence photon dynamic analysis and DFT calculations. This work provides a deeper insight into triplet–triplet energy transfer, as well as presents a new model system for tuning the PL behaviours of ns2 configuration dopants.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Har'kov A. M., Gorev M. V., Balaev A. D., Eremin E. V., Bovina A. F.
Заглавие : The magnetoelastic effect in CoxMn1-xS solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: The magnetoelastic effect in Cox Mn1 - x S solid solutions
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2010. - Vol. 150, Is. 13-14. - P564-567. - ISSN 0038-1098, DOI 10.1016/j.ssc.2010.01.009
Примечания : Cited References: 13. - This work was supported by the Russian Foundation for Basic Research projects no. 08-02-00364-a, no. 08-02-90031, no. F08037, F08-229, and no. 09-02-00554-a.
Предметные рубрики: YVO3 SINGLE-CRYSTAL
SPIN-STATE
TRANSITION
TRANSPORT
PHYSICS
LACOO3
Ключевые слова (''Своб.индексиров.''): semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--coefficient of thermal expansion--magnetoelastic effects--orbital ordering--temperature hysteresis--temperature range--zero magnetic fields--crystallization--electric resistance--magnetic field effects--magnetoresistance--manganese--manganese compounds--neon--organic polymers--scattering--semiconductor quantum dots--solid solutions--solidification--thermal stress--x ray scattering--thermal expansion
Аннотация: The magnetization of cation-substituted CoxMn(1-x)S sulfides upon cooling in zero magnetic field and in a field in the temperature range 4-300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H 0.1 T and at T 240 K. The interrelation between the magnetic and elastic subsystems of the CoxMn1-xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Neel temperature. The features of the physical properties are explained by orbital ordering. (C) 2010 Elsevier Ltd. All rights reserved.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su B., Song G., Molokeev M. S., Lin Z., Xia Z.
Заглавие : Synthesis, crystal structure and green luminescence in zero-dimensional tin halide (C8H14N2)2SnBr6
Место публикации : Inorg. Chem. - 2020. - Vol. 59, Is. 14. - P.9962–9968. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.0c01103
Примечания : Cited References: 33. - This work is supported by the National Natural Science Foundation of China (51961145101, 51722202, and 51972118), Fundamental Research Funds for the Central Universities (D2190980), Guangzhou Science & Technology Project (202007020005), and 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 Research Project No. 19-52-80003
Аннотация: Organic-inorganic hybrid metal halides with broad-band emission are currently receiving an increasing interest for their unique light emission properties. Here we report a novel lead-free zero-dimensional (0D) tin halide, (C8H14N2)2SnBr6, in which isolated [SnBr6]4- octahedrons are cocrystallized with organic cations, 1,3-bis(aminomethyl)benzene (C8H14N22+). Upon photoexcitation, the bulk crystals exhibit broad-band green emission peaking at 507 nm with a full width at half-maximum (fwhm) of 82 nm (0.395 eV), a Stokes shift of 157 nm (1.09 eV), and a photoluminescence quantum yield (PLQY) of 36 ± 4%. Combined structural analysis and density functional theory (DFT) calculations indicate that the excited state structural distortion of [SnBr6]4- octahedral units account for the formation of this green emission. The relatively small Stokes shift and narrow fwhm of the emission are hence caused by the reduced distortion of [SnBr6]4- octahedrons and rigid molecular structure. The discovery of lead-free (C8H14N2)2SnBr6 and insight into the mechanism of green emission provide an essential platform toward unveiling the relationship between structure and property for 0D metal halide perovskites.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Neznakhin D. S., Samoshkina Yu. E., Molokeev M. S., Semenov S. V.
Заглавие : Structural, electrical and magnetic study of manganites Pr0.6Sr0.4MnO3 thin films
Коллективы : Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics
Место публикации : J. Phys. Conf. Ser./ Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics (17 ; 23 - 27 Nov. 2015): IOP Publishing, 2016. - Vol. 690, Is. 1. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/690/1/012002
Примечания : Cited References: 20. - The work was supported partly by RFBR, grant №14-02-01211, Grant of President of Russian Federation №NSh-2886.2014.2, and by The Ministry of Education and Science of the Russian Federation, project №2582.
Ключевые слова (''Своб.индексиров.''): magnetic materials--magnetization--manganese oxide--nanoelectronics--nanostructures--oxide films--field dependence--magnetization temperature curves--polycrystalline phase--polycrystalline pr--resistivity dependence--shape characteristics--structural parameter--zero-field cooling--thin films
Аннотация: Thin polycrystalline Pr0.6Sr0.4MnO3 films were grown on the Y stabilized zirconium oxide substrates by magnetron sputtering using RF power and off-axis sputtering scheme with double cathodes. Only one polycrystalline phase with structural parameters consistent with that for the corresponding bulk sample was revealed in the films. Electric resistivity dependence on temperature demonstrates the shape characteristic for the substances with the Mott transition. The difference between magnetization temperature curves measured in the zero field cooling and field cooling modes was revealed. Magnetization field dependences were presented by the hysteresis loops changing their form with temperature. © Published under licence by IOP Publishing Ltd.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Platunov M. S., Knyazev Yu. V., Kazak N. V., Bezmaternykh L. N., Eremin E. V., Vasiliev A. D.
Заглавие : Spin-glass magnetic ordering in CoMgGaO2BO3 ludwigite
Место публикации : Физ. низких температур: Физико-технический институт низких температур им. Б.И. Веркина НАН Украины, 2012. - Т. 38, Вып. 2. - С.214-217. - ISSN 0132-6414. - ISSN 1816-0328
Примечания : Библиогр.: 13 назв. - This work was supported by the Russian Foundation for Basic Research (project No. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (project No. MK-5632.2010.2), the Physics Division of the Russian Academy of Sciences, the program "Strongly Correlated Electrons" (project 2.3.1).
Предметные рубрики: AC Magnetic susceptibility
DC magnetization
Field cooled
Flux methods
Frequency dependent
Magnetic system
Magnetic transitions
Needle shape
Parent compounds
Spin-glasses freezing
Temperature dependencies
Unit-cell volume
Zero-field-cooled
Cobalt
Cobalt compounds
Freezing
Glass
Magnetic susceptibility
Magnetism
Single crystals
X-ray diffraction
Spin glass
Ключевые слова (''Своб.индексиров.''): spin-glass freezing--transition metal ludwigites
Аннотация: The single crystal needle shape samples of diamagnetically diluted cobalt ludwigite CoMgGaO2BO3 have been grown by the flux method. The results of x-ray diffraction and both dc and ac magnetic measurements are presented. The unit cell volume undergoes a noticable growth under dilution from 328.31 Å3 for the parent compound Co3O2BO3 to 345.46 Å3 for CoMgGaO2BO3. The temperature of magnetic transition is considerably lower for the latter compound (25 K against 43 Kfor Co3O2BO3). The dc magnetization temperature dependencies undergo the splitting of field cooled and zero-field cooled regimes and the ac magnetic susceptibility temperature dependencies are frequency dependent pointing out a possible spin-glass freezing in the magnetic system.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shustin M. S., Aksenov S. V.
Заглавие : Effect of strong intersite Coulomb interaction on the topological properties of a superconducting nanowire
Место публикации : Phys. Solid State. - 2022. - Vol. 64, Is. 13. - P.2047-2053. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2022.13.53972.23s. - ISSN 10906460 (eISSN)
Примечания : Cited References: 55. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science, projects nos. 20-42-243001 and 20-42-243005. M.S.S. thanks the Foundation for the Advancement of Theoretical Physics and Mathematics ”BASIS“. S.V.A. is grateful to the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project No. MK-1641.2020.2
Аннотация: For superconducting nanowire with the pairing of extended s-type symmetry, Rashba spin-orbit interaction in a magnetic field, the influence of strong intersite charge correlations on single-particle Majorana excitations is analyzed. This problem is investigated on the basis of the density matrix renormalization group numerical method. It is shown that with an increase in the repulsion intensity of electrons located at the neighboring sites, two subbands emerge in the lower Hubbard band of the open system. Based on calculations of the Majorana polarization and degeneracy of the entanglement spectrum, it was found that a topologically nontrivial phase with one edge state survives at the edge of each of the subbands where the concentration of electrons or holes is minimal.
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