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Berzhansky, V. N.
Magnetic-field effect on the critical epr-dynamics of the cubic ferromagnets CDCR2SE4 and CDCR2S4 / V. N. Berzhansky, V. I. Ivanov, A. V. Lazuta // Solid State Commun. - 1982. - Vol. 44, Is. 6. - P. 771-775, DOI 10.1016/0038-1098(82)90271-X. - Cited References: 9 . - ISSN 0038-1098

РУБ Physics, Condensed Matter

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Держатели документа:
LV KIRENSKII PHYS INST,KRASNOYARSK 660036,USSR
BP KONSTANTINOV NUCL PHYS INST,GATCHINA 188350,USSR
ИФ СО РАН
Доп.точки доступа:
Ivanov, V. I.; Lazuta, A. V.; Бержанский, Владимир Наумович
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    Competitive site occupation toward improved quantum efficiency of SrLaScO4:Eu red phosphors for warm white LEDs / Z. Y. Yang, G. C. Liu, Y. F. Zhao [et al.] // Adv. Opt. Mater. - 2022. - Vol. 10. Is. 6. - Ст. 2102373, DOI 10.1002/adom.202102373. - Cited References: 42. - This research was supported by the International Cooperation Project of National Key Research and Development Program of China (Program No. 2021YFE0105700), National Natural Science Foundation of China (Grant Nos. 51972118 and 51961145101), Guangzhou Science & Technology Project (Project No. 202007020005), the State Key Laboratory of Luminescent Materials and Devices (Grant No. Skllmd-2021-09), China Postdoctoral Science Foundation (Grant No. 2021M691053), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (Program No. 2017BT01X137). This work was also funded by RFBR according to the research Project No. 19-52-80003 and the NRF International: SA/China Joint Research Programme 2021 - CHIN2002265 06921 UID 132785 . - ISSN 2195-1071
   Перевод заглавия: Конкурентное заселение позиций для повышения квантовой эффективности красных люминофоров SrLaScO4:Eu для тепло-белых светодиодов

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
LUMINESCENCE
   EUROPIUM
   BLUE
   EU2+
   STABILIZATION
   EPR
Кл.слова (ненормированные):
light-emitting diodes -- photoluminescence -- red emission
Аннотация: The discovery of Eu2+-doped high-efficiency red phosphors remains a vital challenge for white light-emitting diode (WLED) applications. It is therefore urgent to find effective strategies managing the oxidation state to help reduce Eu3+ to Eu2+ and accordingly increase the photoluminescence quantum yield (PLQY). Herein, a new red-emitting SrLaScO4:Eu phosphor is designed, and the PLQY is enhanced from 13% to 67% under 450 nm excitation by employing (NH4)2SO4-assisted sintering. Combined structural analysis, optical spectroscopy, and theoretical calculation reveal that predominant Eu2+ prefers to occupy the Sr2+ sites in the SrLaScO4 enabling red emission, and a competitive site occupation of Eu3+ in La3+ can be restrained, and the reduction mechanism of Eu3+ to Eu2+ originating from the (NH4)2SO4 addition is analyzed. The fabricated WLED device using red-emitting SrLaScO4:Eu and yellow-emitting Y3(Al,Ga)5O12:Ce3+ exhibits a high color-rendering index of 86.7 at a low correlated color temperature of 4005 K. This work provides a feasible reduction strategy for guiding the development of high-efficiency Eu2+-doped red phosphor for WLED applications.

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Держатели документа:
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.
City Univ Hong Kong, Dept Chem, Kowloon, Hong Kong 999077, Peoples R China.
KSC SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.
Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa.
South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510641, Peoples R China.

Доп.точки доступа:
Yang, Zhiyu; Liu, Gaochao; Zhao, Yifei; Zhou, Yayun; Qiao, Jianwei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Swart, Hendrik C.; Xia, Zhiguo; International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51972118, 51961145101]; Guangzhou Science & Technology Project [202007020005]; State Key Laboratory of Luminescent Materials and Devices [Skllmd-2021-09]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2021M691053]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]; NRF International: SA/China Joint Research Programme 2021 [CHIN2002265 06921 UID 132785]
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Density-functional model cluster studies of EPR g tensors of F-s(+) centers on the surface of MgO / C. . Di Valentin [et al.] // J. Chem. Phys. - 2006. - Vol. 124, Is. 4. - Ст. 44708, DOI 10.1063/1.2161190. - Cited References: 37 . - ISSN 0021-9606

РУБ Physics, Atomic, Molecular & Chemical
Рубрики:
ELECTRONIC G-TENSORS
   CORRELATION-ENERGY
   MGO(001) SURFACE
   OXYGEN VACANCIES
   SPIN-ORBIT
   G-VALUES
   ATOMS
   APPROXIMATION
   COMPLEXES
   MOLECULES
Кл.слова (ненормированные):
Density-functional model cluster -- Single-crystalline thin films -- Spin-orbit interaction -- Anisotropy -- Paramagnetic resonance -- Single crystals -- Tensors -- Thin films -- Magnesium compounds
Аннотация: We report g tensors of surface color centers, so-called F-s(+) centers, of MgO calculated with two density-functional approaches using accurately embedded cluster models. In line with recent UHV measurements on single-crystalline MgO film, we determined only small g-tensor anisotropies and negative shifts Delta g equivalent to g-g(e) for all F-s(+) sites considered, namely, (001)-terrace, step, edge, and corner sites. The g values are very sensitive to the local structure of the defect: relaxation reverses the sign of Delta g. However, accounting for the spin-orbit interaction either self-consistently or perturbatively yields very similar results. In addition to the values of the tensor components, their direction with respect to the surface was determined. In contrast to edges, significant deviations from ideal C-2v symmetry were found for F-s(+) centers at steps. Recent data on single-crystalline thin films are reevaluated in the light of these results. (c) 2006 American Institute of Physics.

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Держатели документа:
ICREA, Barcelona 08010, Spain
Univ Barcelona & Parc Cientif Barcelona, Dept Quim Fis, Barcelona 08028, Spain
Univ Barcelona & Parc Cientif Barcelona, Ctr Especial Recerca Quim Teor, Barcelona 08028, Spain
Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin, Germany
Russian Acad Sci, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia
Univ Milan Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy
Tech Univ Munich, Dept Chem Theoret Chem, D-85747 Garching, Germany
ИХХТ СО РАН
Dipartimento di Scienza dei Materiali, Universit? degli Studi Milano-Bicocca, 20125 Milano, Italy
Institucio Catalana de Recerca i Estudis Avanats (ICREA), 08010 Barcelona, Spain
Departament de Quimica Fisisca, Centre Especial de Recerca en Quimica Teorica, Parc Cientific de Barcelona, 08028 Barcelona, Spain
Fritz-Haber Institut, Max-Planck Gesellschaft, Department of Chemical Physics, Faradayweg 4-6, D-14195 Berlin, Germany
Institute of Chemistry and Chemical Technology, Russian Academy of Sciences, 660049 Krasnoyarsk, Russian Federation
Department Chemie, Theoretische Chemie, Technische Universitat Munchen, 85747 Garching, Germany

Доп.точки доступа:
Di Valentin, C.; Neyman, K. M.; Risse, T.; Sterrer, M.; Fischbach, E.; Freund, H. J.; Nasluzov, V. A.; Pacchioni, G.; Rosch, N.
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    EPR study of Gd3+ local structure in ScF3 crystal with negative thermal expansion coefficient / A. Antuzevics [et al.] // Phys. Scr. - 2015. - Vol. 90, Is. 11. - Ст. 115801, DOI 10.1088/0031-8949/90/11/115801. - Cited References: 32. - We are grateful to Professor S Ovchinnikov for providing ScFINF3/INF samples. This work was supported by L-KC-11-0005 project Nr.KC/2.1.2.1.1/10/01/006,5.3 . - ISSN 0031-8949
   Перевод заглавия: ЭПР исследование локальной структуры гадолиния в кристалле трехфтористого скандия с отрицательным коэффициентом теплового расширения

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRON-PARAMAGNETIC-RESONANCE
   SPIN-HAMILTONIAN PARAMETERS
   SINGLE-CRYSTALS
   SUPERPOSITION-MODEL
   CENTERS
   SPECTRA
   PHASE
   TEMPERATURE
   SIMULATION
Кл.слова (ненормированные):
electron paramagnetic resonance -- Gd3+ -- ScF3 -- negative thermal expansion
Аннотация: Zero field splitting (ZFS) of Gd3+ impurity in ScF3 is studied by electron paramagnetic resonance at 77 and 295 K. ZFS parameter b4 values obtained from angular dependence simulations show that regardless of negative thermal expansion in ScF3 temperature dependence of |b4| is similar to other cubic fluoroperovskites. Our analysis of ZFS parameters indicates that the local structure of Gd3+ centres expands positively with temperature. © 2015 The Royal Swedish Academy of Sciences.

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Держатели документа:
Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, Riga, Latvia
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Antuzevics, A.; Rogulis, U.; Fedotovs, A.; Berzins, D.; Voronov, V. N.; Воронов, Владимир Николаевич; Purans, J.
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EPR study of nanodefects with elpasolite structure [Text] / Voronov V.N., Petrakovskaya E.A. // International Conference "Functional Materials" (ICFM-2011) : Book of abstracts. - 2011. - P85

Доп.точки доступа:
Voronov, V.N.; Petrakovskaya, E.A.; "Functional Materials", International Conference(4 ; 2011 ; Oct. ; 3-8 ; Crimea, Ukraine); "Функциональные материалы", Международная конференция(4 ; 2011 ; Симферополь, Украина)
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EPR study of single crystals Rb2KB F6 (B* = Sc, Fe, Dy) with elpasolite structure [Text] / V. N. Voronov, E. A. Petrakovskaya // International Conference Functional Materials (ICFM-2011) : Book of abstracts : [3-8 Oct. 2011, Crimea, Ukraine]. - 2011. - P85

Доп.точки доступа:
Voronov, V.N.; Petrakovskaya, E.A.; International Conference Functional Materials(6 ; 2011 ; Oct. ; Crimea, Ukraine)
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EPR Study of Solid Solutions Based on the Compound ScF3 [Text] / Voronov V.N., Petrakovskaya E.A., Alexandrovskaya A.V. // Functional Materials. - 2010. - Vol. 17, Is. 3. - P324-328

Доп.точки доступа:
Voronov, V. N.; Воронов Владимир Николаевич; Petrakovskaya, E. A.; Петраковская Элеонора Анатольевна; Alexandrovskaya, A. V.
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EPR study of solid solutions, based on the compound ScF3 [Text] / V. N. Voronov, E. A. Petrakovskaya, A. V. Alexandrovskaya // International Conference "Functional Materials" (ICFM-09) : book of abstracts : october 5-10, Ukraine, Crimea, Partenit. - 2009. - P61

Доп.точки доступа:
Voronov, V.N.; Petrakovskaya, E.A.; Alexandrovskaya, A.V.; "Functional Materials", International Conference(4 ; 2009 ; OCT ; Partenit, Crimea, Ukraine)
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EPR study of the Jahn-Teller effect of Cu2+ ions in ZnGa2O4 / A. M. Vorotynov [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 11. - P. 2415-2418, DOI 10.1134/S1063783410110314. - Cited References: 12 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
PARTICLES
CUFE2O4
Аннотация: The Jahn-Teller effect in the ZnGa2O4 spinel single crystal has been investigated using electron paramagnetic resonance of Cu2+ ions in the temperature range 110-560 K. It has been shown that copper ions occupy octahedral sites 16d in the ZnGa2O4 crystal with cubic symmetry O (h) (7) (Fd-3m). At T 560 K, the octahedra undergo tetragonal distortions (predominantly tension) and rotation around the fourfold axes by the angle theta a parts per thousand 2.6A degrees. The parameters of the spin Hamiltonian, which characterize the prolate (g (aEuro-)

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Держатели документа:
[Vorotynov, A. M.
Petrakovskii, G. A.
Sablina, K. A.
Bovina, A. F.
Vasil'ev, A. D.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Vorotynov, A. M.; Воротынов, Александр Михайлович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна; Bovina, A. F.; Бовина, Ася Федоровна; Vasil'ev, A. D.; Васильев, Александр Дмитриевич
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10.

EPR-determined anisotropy of the g-factor and magnetostriction of a Cu2MnBO5 single crystal with a ludwigite structure / A. A. Dubrovskiy [et al.] // JETP Letters. - 2017. - Vol. 106, Is. 11. - P. 716-719, DOI 10.1134/S0021364017230072. - Cited References:18. - This study was supported jointly by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory (project no. 16-42-243028). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
ELECTRON-SPIN-RESONANCE
Аннотация: Electron paramagnetic resonance (EPR) and magnetostriction of the Cu2MnBO5 single crystal have been studied. The EPR spectrum consists of a single Lorentzian line due to the exchange-coupled system of spins of Cu2+ and Mn3+ ions. It has been established experimentally that the g-factor in the paramagnetic region is strongly anisotropic and anomalously small, which is not typical of the exchange-coupled system of spins of Cu2+ and Mn3+ ions. At a temperature of 150 K, the g-factors along the crystallographic a, b, and c axes are 2.04, 1.96, and 1.87, respectively. Such small effective g-factor values can be due to the effect of the anisotropic Dzyaloshinskii-Moriya exchange interaction between the spins of Cu2+ and Mn3+ ions directed along the a axis. The presence of two Cu2+ and Mn3+ Jahn-Teller ions occupying four nonequivalent positions in the crystal is responsible for the absence of the inversion center. It is found that the behavior of the magnetostriction of Cu2MnBO5 is not typical of transition-metal crystals but is closer to the behavior of crystals containing rare-earth ions.

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Публикация на русском языке Анизотропия g-фактора, определенная методом ЭПР, и магнитострикция монокристалла Cu2MnBO5 со структурой людвигита [Текст] / А. А. Дубровский [и др.] // Письма в Журн. эксперим. и теор. физ. - 2017. - Т. 106 Вып. 11. - С. 685-688

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Zavoisky Phys Tech Inst, Kazan 420029, Russia.

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Moshkina, E. M.; Мошкина, Евгения Михайловна; Yatsyk, I. V.; Eremina, R. M.; Russian Foundation for Basic Research; Government of the Krasnoyarsk Territory [16-42-243028]
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