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1.
Val'kov, V. V.
Radiation-induced modification of the temperature dependence of the magnetic susceptibility of a 1D magnet / V. V. Val'kov, M. S. Shustin> // JETP Letters. - 2014. -
Vol. 100
,
Is. 7
. - P. 455-462,
DOI
10.1134/S0021364014190138. - Cited References: 28. - This work was supported by the Russian Foundation for Basic Research, project nos. 12-02-31130, 13-02-00523, and 13-02-98013. . - ISSN 0021-3640. - ISSN 1090-6487
РУБ
Physics, Multidisciplinary
Рубрики:
SINGLE-CHAIN MAGNETS
EASY-PLANE
ARRANGEMENT
MODEL
IONS
Аннотация:
TThe excitation spectrum of a catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 anisotropic 1D magnet with alternating high-spin and low-spin iron
ions
has been calculated with the use of the diagrammatic technique for Hubbard operators. This has allowed establishing conformity with the Ising model, for which the magnetic susceptibility has been calculated by the transfer-matrix method. The introduction of a statistical ensemble taking into account the presence of chains with different lengths and iron
ions
with different spins has allowed describing the modification of the magnetic susceptibility under optical irradiation.
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Публикация на русском языке
Вальков, Валерий Владимирович. Модификация температурной зависимости магнитной восприимчивости 1D-магнетика под действием облучения [Текст] / В. В. Вальков, М. С. Шустин // Письма в Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 100 Вып. 7. - С. 510-517
Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [12-02-31130, 13-02-00523, 13-02-98013]
}
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2.
Val'kov, V. V.
Quantum renormalizations in anisotropic multisublattice magnets and the modification of magnetic susceptibility under irradiation / V. V. Val'kov, M. S. Shustin> // J. Exp. Theor. Phys. - 2015. -
Vol. 121
,
Is. 5
. - P. 860-877,
DOI
10.1134/S1063776115110175. - Cited References:46. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00523, 14-02-31237, and 15-42-04372 . - ISSN 1063-7761. - ISSN 1090-6509
РУБ
Physics, Multidisciplinary
Рубрики:
SINGLE-CHAIN MAGNETS
GLAUBER MODEL
EASY-PLANE
ARRANGEMENT
SYSTEMS
IONS
Аннотация:
The dispersion equation of a strongly anisotropic one-dimensional magnet catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 containing alternating high-spin (HS) (S = 2) and low-spin (LS) (S = 1/2) iron
ions
is obtained by the diagram technique for Hubbard operators. The analysis of this equation yields six branches in the excitation spectrum of this magnet. It is important that the crystal field for
ions
with spin S = 2 is described by the Hamiltonian of single-ion easy-plane anisotropy, whose orientation is changed by 90° when passing from one HS iron ion to another. The U(N) transformation technique in the atomic representation is applied to diagonalize a single-ion Hamiltonian with a large number of levels. It is shown that the modulation of the orientation of easy magnetization planes leads to a model of a ferrimagnet with easy-axis anisotropy and to the formation of energy spectrum with a large gap. For HS iron
ions
, a decrease in the mean value of the spin projection due to quantum fluctuations is calculated. The analysis of the specific features of the spectrum of elementary excitations allows one to establish a correspondence to a generalized Ising model for which the magnetic susceptibility is calculated in a wide range of temperatures by the transfer-matrix method. The introduction of a statistical ensemble that takes into account the presence of chains of different lengths and the presence of iron
ions
with different spins allows one to describe the experimentally observed modification of the magnetic susceptibility of the magnet under optical irradiation.
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Публикация на русском языке
Вальков, Валерий Владимирович. Квантовые ренормировки в анизотропных многоподрешеточных магнетиках и модификация магнитной восприимчивости при облучении [Текст] / В. В. Вальков, М. С. Шустин // Журнал экспериментальной и теоретической физики : Наука, 2015. - Т. 148 Вып. 5. - С. 984-1004
Держатели документа:
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [13-02-00523, 14-02-31237, 15-42-04372]
}
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3.
Unusual magnetic transitions
and nature of magnetic resonance spectra in oxide glasses containing gadolinium / J. . Kliava [et al.]> // Phys. Rev. B. - 2005. -
Vol. 71
,
Is. 10
. - Ст. 104406,
DOI
10.1103/PhysRevB.71.104406. - Cited References: 40 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
ELECTRON-PARAMAGNETIC-RESONANCE
BORATE GLASSES
IONS
BEHAVIOR
GD3+
SPECTROSCOPY
SYSTEMS
GD-3+
FIELD
SHAPE
Кл.слова (ненормированные):
gadolinium
--
glass
--
lanthanide
--
oxide
--
anisotropy
--
article
--
chemical structure
--
concentration response
--
electron spin resonance
--
energy
--
magnetism
--
molecular physics
--
nanoparticle
--
phase transition
--
refraction index
--
temperature sensitivity
Аннотация:
Magnetic susceptibility, electron paramagnetic resonance (EPR), and optical properties have been studied in a glass system {20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in the more heavily doped glasses and ascribed to clustering of Gd3+
ions
. Two magnetic phase transitions at 55 and 12 K were detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters containing Gd
ions
. The overall shape of the EPR spectra shows the presence of clustering at the higher Gd contents. At low temperatures the cluster-related resonance signal is altered in shape, indicating an onset of magnetic anisotropy field. This signal is convincingly fitted to superparamagnetic resonance arising from ferromagnetic nanoparticles. The clustering, depending on the Gd concentration, correlates with a significant shift to lower energies of the strong optical absorption band edge, ascribed to a charge transfer transition between Gd
ions
. A nonmonotonous change of refractive index with the increase of the Gd content indicates changes in the glass matrix and in Gd cluster structure.
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Держатели документа:
Univ Bordeaux 1, CNRS, UMR 5798, CPMOH, F-33405 Talence, France
Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel
RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
SI Vavilov State Opt Inst, St Petersburg 199034, Russia
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
ИФ СО РАН
CPMOH, UMR 5798, CNRS-Universite Bordeaux-I, 33405 Talence Cedex, France
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
L. V. Kirensky Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation
S. V. Vavilov State Optical Institute, St. Petersburg 199034, Russian Federation
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
Доп.точки доступа:
Kliava, J.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Melnikova, S.V.; Мельникова, Светлана Владимировна; Zarubina, T. V.; Petrovskii, G.; Bruckental, Y.; Yeshurun, Y.
}
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4.
Uniaxial magnetic anisotropy
of rhombohedral CoCO3 crystals at T = 0 K / V. V. Men'shikov [et al.]> // Phys. Solid State. - 2014. -
Vol. 56
,
Is. 3
. - P. 468-472,
DOI
10.1134/S1063783414030196. - Cited References: 21 . - ISSN 1063-7834. - ISSN 1090-6460
РУБ
Physics, Condensed Matter
Рубрики:
ANTIFERROMAGNETIC RESONANCE
IONS
Аннотация:
A method for calculating the contribution of exchange interaction to uniaxial anisotropy with the use of g' factors has been worked out using CoCO3 crystals as an example. The calculated contribution of dipole-dipole interactions to the anisotropy of CoCO3 is 0.93 cm(-1). The sum of the contributions to the anisotropy constant of CoCO3 with the inclusion of the dipole-dipole interactions is 36.1 cm(-1).
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Публикация на русском языке
Одноосная магнитная анизотропия ромбоэдрических кристаллов CoCO3 при T = 0K [Текст] / В. В. Меньшиков [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2014. - Т. 56 Вып. 3. - С. 459-462
Доп.точки доступа:
Men'shikov, V. V.; Меньшиков, Виктор Васильевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Tugarinov, V. I.; Тугаринов, Василий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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5.
Synthesis and luminescence
properties of blue-emitting phosphor Li3c2(PO4)3:Er2+ / S. X. Yu [et al.]> // ECS J. Solid State Sci. Technol. - 2014. -
Vol. 3
,
Is. 8
. - P. R159-R163,
DOI
10.1149/2.0071408jss. - Cited References: 33. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51002146, No. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). Z. G. Xia is also grateful for the financial support from University of Science and Technology Beijing. V.V.A. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for the financial support. . - ISSN 2162-8769. - ISSN 2162-8777
Перевод заглавия:
Синтез и люминесцентные свойства синего люминофора Li3Sc2(PO4)3:Eu2+
РУБ
Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
ENERGY-TRANSFER
PHOTOLUMINESCENCE PROPERTIES
INORGANIC-COMPOUNDS
EMISSION COLOR
FULL-COLOR
DIODES
Eu2+
IONS
LEDS
Tb
Аннотация:
A new blue-emitting phosphor Li3Sc2(PO4)3:Eu2+ was synthesized by a high temperature solid-state reaction method, and the crystal structure and photoluminescence properties were investigated in detail. The preferred crystallographic position of the Eu2+
ions
in the Li3Sc2(PO4)3 host were determined from the structural analysis and spectroscopic properties. The as-prepared phosphor gave an intense blue emission band centered at 439 nm with the CIE coordinate of (0.1540, 0.0317) upon the excitation of the near ultraviolet light. The critical quenching concentration of Eu2+ in Li3Sc2(PO4)3:Eu2+ was about 15 mol%, and the corresponding concentration quenching mechanism was verified to be the dipole-quadrupole interaction. The fluorescence lifetime of Eu2+ emission and the thermal stable luminescence property have been investigated. Li3Sc2(PO4)3:Eu2+ was found to be a promising candidate as a blue-emitting n-UV convertible phosphor for the application in white light emitting diodes (w-LEDs).
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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, LV Kirensky Phys Inst, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielectr Mat, Novosibirsk 630090, Russia
Доп.точки доступа:
Yu, Shixin; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Miao, Hao; Atuchin, V. V.
}
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6.
Preparation and luminescence
properties of the blue-emitting phosphor BaBPO5:Eu2+ / L. Zhang [et al.]> // Sci. Adv. Mater. - 2016. -
Vol. 8
,
Is. 5
. - P. 1086-1092,
DOI
10.1166/sam.2016.2704. - Cited References: 22. - This work was financially supported by the National Natural Science Foundation of China (NSFC Grant no. 51172216) and the Fundamental Research Funds for the Central Universities (Grant no. 2652015022). . - ISSN 1947-2935
Перевод заглавия:
Синтез и люминесцентные свойства синего люминофора BaBPO5:Eu2+
РУБ
Nanoscience & Nanotechnology + Physics, Applied + Physics, Applied
Рубрики:
Energy-transfer
Diodes
Ions
Eu3+
Photoluminescence
Reduction
Tb3+
Кл.слова (ненормированные):
BaBPO5
--
Eu2+
--
Phosphor
--
White light emitting diodes
Аннотация:
Blue-emitting BaBPO5:xEu2+ phosphors were prepared by a high-temperature solid-state reaction route. The crystal phase, luminescence properties, lifetime, and thermal stability were investigated, respectively. The phase analysis indicated that BaBPO5 crystallize with the structure of stillwellite-type compounds. Under the excitation at 310 nm, the phosphor exhibited an asymmetric broad-band blue emission with peak at 410 nm, which was ascribed to the 4f-5d transition of Eu2+. It was further calculated that the dipole-dipole interactions were responsible for a concentration quenching effect in BaBPO5:xEu2+ phosphors at x = 0.08. The lifetime decreased with the increasing concentration of Eu2+
ions
. The temperature-dependent emission spectra indicated an excellent thermal stability of the BaBPO5:0.08Eu2+ samples. Surface morphology and CIE coordinate were also investigated. All the properties assessed indicated that the developed blue-emitting BaBPO5:Eu2+ phosphor is a good candidate for application in white-light emitting diodes. © 2016 by American Scientific Publishers.
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Держатели документа:
School of Materials Science and Technology, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing), Beijing, China
National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Grirem Advanced Materials Co., Ltd., Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Доп.точки доступа:
Zhang, L.; Fang, M.; Huang, Z.; Liu, Y.; Min, X.; Tang, H.; Chen, K.; Guan, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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7.
Origin of color
centers in the flux-grown europium gallium garnet / A. S. Aleksandrovsky [et al.]> // J. Appl. Phys. - 2008. -
Vol. 103
,
Is. 8
. - Ст. 83102,
DOI
10.1063/1.2902365. - Cited References: 7 . - ISSN 0021-8979
РУБ
Physics, Applied
Рубрики:
SPECTRA
IONS
Кл.слова (ненормированные):
Absorption
--
Europium alloys
--
Garnets
--
Ultraviolet radiation
--
Calcium-free flux
--
Flux-grown europium gallium garnet
--
Color centers
Аннотация:
Europium gallium garnet (EuGG) single crystals were grown from fluxes with various contents. Optical absorption spectra of EuGG grown from a flux containing calcium show an additional band in the ultraviolet and blue regions of the spectra as compared to the case of a calcium-free flux. Mossbauer spectra of the samples grown from the fluxes with different additives show no signs of other valence states of the europium
ions
except for 3+. However, they indicate changes in the crystal field due to the entrance of additive
ions
. The nature of the additional absorption must be the same as that for calcium-doped gadolinium gallium garnet, i.e., anion vacancies. Mossbauer isotope shifts and quadrupole splitting for EuGG are determined. (C) 2008 American Institute of Physics.
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Держатели документа:
[Aleksandrovsky, A. S.
Arkhipkin, V. G.
Bezmaternykh, L. N.
Gudim, I. A.
Krylov, A. S.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Aleksandrovsky, A. S.
Arkhipkin, V. G.
Bezmaternykh, L. N.
Gudim, I. A.
Krylov, A. S.] Siberian Fed Univ, Krasnoyarsk 660079, Russia
[Vagizov, F.] Texas A&M Univ, Dept Phys, College Stn, TX 77840 USA
ИФ СО РАН
L. V. Kirensky Institute of Physics, Siberian Federal University, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Department of Physics, Texas A and M University, College Station, TX 77840, United States
Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Krylov, A. S.; Крылов, Александр Сергеевич; Vagizov, F.
}
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8.
Nature of optical
properties of GdFe3(BO3)4 and GdFe2.1Ga0.9(BO3)4 crystals and other 3d5 antiferromagnets / A. V. Malakhovskii [et al.]> // Eur. Phys. J. B. - 2012. -
Vol. 85
,
Is. 2
. - P. 80,
DOI
10.1140/epjb/e2012-20953-1. - Cited References: 70. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by Russian President Grant NSh-1044.2012.2. . - ISSN 1434-6028
РУБ
Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)4
D-D TRANSITIONS
EARTH FERROBORATES RFE3(BO3)4
ABSORPTION-SPECTRA
OCTAHEDRAL COMPLEXES
ELECTRONIC-STRUCTURE
NEEL TEMPERATURE
FINE-STRUCTURE
EXCHANGE
IONS
Аннотация:
Influence of the partial substitution of paramagnetic Fe3+
ions
by diamagnetic Ga3+
ions
in the trigonal crystal GdFe3 (BO3)4 on its optical and magnetic properties is studied and discussed in connection with problems common for all antiferromagnets containing 3d 5
ions
. Polarized optical absorption spectra and linear birefringence of GdFe3 (BO3)4 and GdFe2.1Ga0.9 (BO3)4 single crystals have been measured in the temperature range 85–293 K. Specific heat temperature dependence (2–300 K) and structure of GdFe2.1Ga0.9 (BO3)4 crystal have been also studied. As a result of substitution of 30% Fe to Ga the Neel temperature diminishes from 38 till 16 K, the strong absorption band edge shifts on 860 cm-1 (0.11 eV) to higher energy and the d-d transitions intensity decreases substantially larger than the Fe concentration does. Strong absorption band edge is shown to be due to Mott-Hubbard transitions. Correlation between position of the strong absorption band edge and the Neel temperature of antiferromagnets has been revealed. Properties of the doubly forbidden d-d transitions in the studied crystals and in other antiferromagnets are explained within the framework of the model of the exchange-vibronic pair absorption, which is theoretically analyzed in detail. The model permitted us to determine the connection between parameters of d-d absorption bands (intensity, width and their temperature dependences), on the one hand, and the exchange, spin-orbit and electron-lattice interactions, on the other hand.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Leont'ev, A. A.; Леонтьев, Андрей Александрович; Kartashev, A. V.; Карташев, Андрей Васильевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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9.
Multiple substitution strategies
toward tunable luminescence in Lu2MgAl4SiO12:Eu2+ phosphors / Z. Ming, J. Qiao, M. S. Molokeev [et al.]> // Inorg. Chem. - 2020. -
Vol. 59
,
Is. 2
. - P. 1405-1413,
DOI
10.1021/acs.inorgchem.9b03142. - Cited References: 31. - This research is supported by the National Natural Science Foundation of China (Grants 51972118, 51722202, and 51572023), Natural Science Foundations of Beijing (Grant 2172036), and Fundamental Research Funds for the Central Universities (Grant FRF-TP-18-002C1) . - ISSN 0020-1669. - ISSN 1520-510X
Перевод заглавия:
Стратегии множественного замещения для перестраиваемой люминесценции в люминофорах Lu2MgAl4SiO12:Eu2+
Рубрики:
Physical and chemical processes
Phosphors
Luminescence
Cations
Ions
Аннотация:
The equivalent or heterovalent substitution strategy is an efficient way to stimulate photoluminescence tuning or to optimize the luminescence performances of phosphor materials. Garnet-type compounds receive much attention as phosphor hosts because of their flexible structural frameworks. Herein, a garnet-type Lu2MgAl4SiO12:Eu2+ phosphor with broad-band blue-green emission is first explored with two-site occupation by varying the Eu2+ content. Two host-substitution approaches to controlling the luminescence behavior of Lu2MgAl4SiO12:Eu2+ phosphor are implemented. The cation substitution strategy of Ca2+ for Mg2+ achieves tunable emission from 463 to 503 nm together with broadening emission bands in Lu2Mg1–yCayAl4SiO12:Eu2+ phosphors. Moreover, chemical unit cosubstitution of [Ca2+–Ge4+] replacing [Lu3+–Al3+] results in Lu2–zCazMgAl4–zGezSiO12:Eu2+ phosphors, which induce a red shift of the emission peak of about 60 nm and a broadening in the emission spectra with increasing Ca2+ and Ge4+ concentrations. The possible photoluminescence tuning mechanism is ascribed to the coordination sphere variation in the EuO8 polyhedron depending on the changing neighboring cations. The proposed approaches on equivalent or heterovalent substitution can contribute to the development of Eu2+-activated garnet-type phosphors with regulation of the luminescence performance and further initiate research discovering new phosphors for white-light-emitting diodes.
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Держатели документа:
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China
Доп.точки доступа:
Ming, Zhiqiang; Qiao, Jianwei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Swart, Hendrik C.; Xia, Zhiguo
}
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10.
Magneto-optical properties of
Dy3+ in oxide glasses: The origin of the magneto-optical activity of f-f transitions and its anomalous temperature dependence / A. V. Malakhovskii [et al.]> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 4
. - P. 701-707,
DOI
10.1134/S1063783407040178. - Cited References: 28 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
MAGNETIC CIRCULAR-DICHROISM
FLUOROZIRCONATE ZBLAN GLASS
OPTICAL-ABSORPTION SPECTRA
DOPED SODA GLASS
SPECTROSCOPIC PROPERTIES
FLUOROBORATE GLASSES
LITHIUM BORATE
IONS
PR3+
GADOLINIUM
Аннотация:
The temperature dependence of the absorption spectra and magnetic circular dichroism due to f-f transitions from the H-6(15/2) to F-6 (5/2) and (6)(F (7/2) + H (5/2)) states in the Dy3+ ion in (Dy2O3-P2O5-SiO2-GeO2) and (Dy2O3-La2O3-Al2O3-B2O3-SiO2-GeO2) glasses and the temperature dependence of the Faraday effect were studied. The temperature dependence of the Faraday effect caused by f-d transitions was found to differ from that of the magnetic circular dichroism due to f-f transitions. It was shown that f-f transitions occur preferentially in Dy3+
ions
associated into clusters. The origin of the paramagnetic magneto-optical activity of f-f transitions was analyzed. It was shown that the contributions to this activity can differ in value and sign and that the ratio between these contributions depends on the transition type. In some cases, this difference results in an anomalous temperature dependence of the magneto-optical activity.
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Публикация на русском языке
Магнитооптические свойства Dy3+ в оксидных стеклах. Природа магнитооптической активности f-f-переходов и ее аномальной температурной зависимости [Текст] / А. В. Малаховский [et al.] // Физика твердого тела. - Санкт-Петербург : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2007. - Т. 49 № 4. - С. 667-673
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
SI Vavilov State Opt Inst, St Petersburg 192371, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660041, Russian Federation
Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 192371, Russian Federation
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Isachenko, V. A.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Potseluyko, A. M.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Zarubina, T. V.; Edelman, I. S.; Эдельман, Ирина Самсоновна
}
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11.
Magneto-optical activity of
f–f transitions in ErFe3(BO3)4 and ErAl3(BO3)4 single crystals / A. V. Malakhovskii [et al.]> // J. Magn. Magn. Mater. - 2015. -
Vol. 384
. - P. 255-265,
DOI
10.1016/j.jmmm.2015.02.051. - Cited References: 44. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by the President of Russia Grant no. Nsh-2886.2014.2. . - ISSN 0304-8853. - ISSN 1873-4766
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
CIRCULAR-DICHROISM SPECTRA
GREEN UP-CONVERSION
SPECTROSCOPIC PROPERTIES
OPTICAL-PROPERTIES
LASER
Er3+
ABSORPTION
GROWTH
IONS
GdFe3(BO3)4
Кл.слова (ненормированные):
Magnetic circular dichroism
--
Natural circular dichroism
--
Rare earth ferroborates
--
Rare earth alumoborates
--
Electronic structure
Аннотация:
Absorption, magnetic circular dichroism and natural circular dichroism spectra of ErFe3(BO3)4 and ErAl3(BO3)4 single crystals were measured as a function of temperature in the range of 90–293 K. It was found out that magneto-optical activity of the same f–f transitions in the studied crystals substantially differed and their temperature dependences did not follow the Curie–Weiss law in contrast to the properties of allowed transitions. The observed phenomena were accounted for by the nature of f–f transitions allowance. Properties of the transition 4I15/2→4S3/2 were studied in detail. In particular, the Zeeman splitting and the natural optical activity of the absorption lines composed of the transition were determined. The vibronic line with the very large natural optical activity was revealed and identified. Two nonequivalent Er3+ ion positions with the opposite chirality were found out in one of the excited states. Polarization properties of the 4I15/2→4S3/2 transition in the ErFe3(BO3)4 crystal have shown that the local symmetry of Er3+ ion in this crystal in the range of 90–293 K is lower than the D3 one. From the heat capacity measurements it was revealed, that the first order structural phase transition to lower symmetry occurred in ErFe3(BO3)4 at 433–439 K.
Поглощение, магнитный циркулярный дихроизм и спектры природного кругового дихроизма монокристаллов ErFe3(BO3)4 и ErAl3(BO3)4 были измерены в зависимости от температуры в диапазоне 90-293 К. Было обнаружено, что по магнитооптической активности одни и те жеF-F переходы в исследованных кристаллах существенно отличаются и их температурные зависимости не следовать закону Кюри-Вейсса в отличие от свойств разрешенных переходов. Наблюдаемые явления были учтены по характеру F-Fпереходов. Свойства перехода 4I15 / 2 → 4S3 / 2 были детально изучены. В частности, расщепление Зеемана и явление естественной оптической активности линий поглощения, состоящих в переходе были полны решимости. Вибронная линия очень большой естественной оптической активности выявлена и идентифицирована. Две неэквивалентных позиций ионовEr3 + с противоположной хиральности были найдены в одном из возбужденных состояний. Поляризационные свойства 4I15 / 2 → 4S3 / 2 перехода в ErFe3(BO3)4 кристалла показали, что локальная симметрия ионов Er3 + в этом кристалле в диапазоне 90-293 К ниже, чем D3. Из измерений теплоемкости Было обнаружено, что структурный фазовый переход первого типа к более низкой симметрии произошел в ErFe3(BO3) 4 при 433-439 К. Ключевые слова: Магнитный круговой дихроизм; Природные круговой дихроизм; Редкоземельные ферроборатов; Редкоземельныеalumoborates; Электронная структура; 44 источника.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Sokolov, V. V.; Соколов В. В.; Kutsak, T. V.; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Researches [12-02-00026]; President of Russia Grant [Nsh-2886.2014.2]
}
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12.
Magnetic and optical
properties and electron paramagnetic resonance of gadolinium-containing oxide glasses / J. . Kliava [et al.]> // J. Phys.: Condens. Matter. - 2003. -
Vol. 15
,
Is. 40
. - P. 6671-6681,
DOI
10.1088/0953-8984/15/40/005. - Cited References: 30 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
ABSORPTION-SPECTRA
FARADAY-ROTATION
SPIN-RESONANCE
IONS
GD3+
SPECTROSCOPY
BEHAVIOR
GD-3
Кл.слова (ненормированные):
Doping (additives)
--
Electronic structure
--
Glass
--
Lanthanum compounds
--
Light absorption
--
Magnetic susceptibility
--
Oxides
--
Paramagnetic resonance
--
Positive
ions
--
Rate constants
--
Substitution reactions
--
Absorption band
--
Gadolinium containing oxide glasses
--
Positive Weiss constants
--
Gadolinium compounds
Аннотация:
Magnetic susceptibility, electron paramagnetic resonance (EPR) and optical absorption have been studied in a glass system 20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2 + GeO2) with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses and ascribed to clustering of Gd3+
ions
. Computer simulations of the EPR spectra show that the short-range ordering in the environment of the Gd3+
ions
is well preserved. The relative distribution widths of the ligand coordinates are less than 2%. In the more heavily doped glasses the EPR spectra are superpositions of signals arising from isolated
ions
and ferromagnetic clusters. The increase of Gd3+ concentration is shown to change substantially the strong optical absorption edge while only small changes of f-f absorption band characteristics are observed. This difference is associated with the different effect of the Gd ion clustering on the mechanisms of the strong absorption in the ultraviolet region and the f-f absorption.
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Держатели документа:
Univ Bordeaux 1, CPMOH, F-33405 Talence, France
SI Vavilov State Opt Inst, St Petersburg 199034, Russia
Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
CPMOH, Universite Bordeaux-I, 33405 Talence Cedex, France
L V Kirensky Inst. of Physics, SB RAS, Krasnoyarsk 660036, Russian Federation
Bar-Ilan University, Department of Physics, Ramat-Gan 52900, Israel
Bar-Ilan University, Department of Chemistry, Ramat-Gan 52900, Israel
S V Vavilov State Optical Institute, St Petersburg 199034, Russian Federation
Доп.точки доступа:
Kliava, J.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Berger, R.; Bruckental, I.; Yeshurun, Y.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Zarubina, Y. V.
}
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13.
Magnetic and natural
optical activity of f–f transitions in multiferroic Nd0.5Gd0.5Fe3(BO3)4 / A. V. Malakhovskii [et al.]> // Phys. Solid State. - 2016. -
Vol. 58
,
Is. 5
. - P. 952-958,
DOI
10.1134/S1063783416050152. - Cited References:29. - This study was supported by the Council on Grants from the President of the Russian Federation for the State Support of Leading Scientific Schools (grant no. NSh-2886.2014.2) and the Russian Foundation for Basic Research (project no. 16-02-00273). . - ISSN 1063-7834. - ISSN 1090-6460
РУБ
Physics, Condensed Matter
Рубрики:
Circular-dichroism spectra
Magnetooptical properties
Single-crystal
Absorption
Ions
NdFe3(BO3)4
Nd3+
Pr3+
Ho3+
Аннотация:
Spectra of absorption, magnetic circular dichroism, and natural circular dichroism of the f–f transitions 4I9/2 → 4F3/2, 2H9/2 + 4F5/2, 4S3/2 + 4F7/2, 2G7/2 + 4G5/2, 2K13/2 + 4G7/2, and 4G9/2 in the Nd3+
ions
in the Nd0.5Gd0.5Fe3(BO3)4 crystal have been measured as a function of the temperature in the interval of 90–300 K. Temperature dependences of the magneto-optical activity (MOA) and natural optical activity (NOA) of the transitions have been obtained. It has been found that, in contrast to allowed transitions, the temperature dependence of the MOA of the f–f transitions does not obey the Curie–Weiss law and the NOA depends on temperature. The NOA of some transitions changes the sign with variation in temperature. These phenomena have been explained by the presence of three contributions to the allowance of the f–f transitions, which lead to three contributions of different signs to the MOA and NOA. The range of the MOA of the f–f transitions in the Nd3+ ion has been predicted theoretically and confirmed experimentally.
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Магнитная и естественная оптическая активность f-f- переходов в мультиферроике Nd0.5Gd0.5Fe3(BO3)4 [Текст] / А. В. Малаховский [и др.] // Физ. тверд. тела. - 2016. - Т. 58 Вып. 5. - С. 923–928
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Leont'ev, A. A.; Леонтьев, Андрей Александрович; Temerov, V. L.; Темеров, Владислав Леонидович; Council on Grants from the President of the Russian Federation for the State Support of Leading Scientific Schools [NSh-2886.2014.2]; Russian Foundation for Basic Research [16-02-00273]
}
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14.
Giant natural circular
dichroism of vibronic transitions in HoAl3(BO3)4 / A. V. Malakhovskii [et al.]> // JETP Letters. - 2015. -
Vol. 102
,
Is. 8
. - P. 493-495,
DOI
10.1134/S0021364015200084. - Cited References: 15. - This work was supported by the Council of the President of the Russian Federation for the Support of Leading Scientific Schools (project no. NSh-2886.2014.2). . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
SINGLE-CRYSTAL
OPTICAL-ABSORPTION
SPECTRA
Ho3+
IONS
PR3+
Аннотация:
The giant natural optical activity of vibronic replicas of the f–f5/8 → 5F2 transition in HoAl3(BO3)4 is observed. It exceeds the optical activity related to purely electronic transitions by two orders of magnitude and corresponds to the almost complete circular polarization of the transitions. This effect is explained by the local distortions of the crystal in the excited electronic state, which lead to the mixing of electron and vibrational wavefunctions and, as a consequence, to the delocalization of the vibronic wavefunction and the enhancement of spatial dispersion, which is responsible for the optical activity.
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Гигантский естественный круговой дихроизм вибронных переходов в HoAl3(BO3)4 [Текст] / А. В. Малаховский [и др.] // Письма в ЖЭТФ : Наука, 2015. - Т. 102 Вып. 8. - С. 555-557
Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Sokolov, V. V.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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15.
Geng, K.
Crystal structure and luminescence property of a novel blue-emitting Cs2xCa2xGd2(1−x)(PO4)2:Eu2+ (x = 0.36) phosphor / K. Geng, Z. G. Xia, M. S. Molokeev> // Dalton Trans. - 2014. -
Vol. 43
,
Is. 37
. - P. 14092-14098,
DOI
10.1039/c4dt01578a. - Cited References: 29. - This present work was supported by the National Natural Science Foundation of China (grant no. 51002146, no. 51272242), Natural Science Foundation of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), the Fundamental Research Funds for the Central Universities (2011YYL131), Beijing Nova Program (Z131103000413047) and Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). . - ISSN 1477-9226. - ISSN 1477-9234
Перевод заглавия:
Кристаллическая структура и люминесцентные свойства нового синего люминофора Cs2xCa2xGd2(1-x)(PO4)2:Eu2+ (x = 0.36)
РУБ
Chemistry, Inorganic & Nuclear
Рубрики:
ENERGY-TRANSFER
DIODES
EARTH
EU-2+
PHASE
IONS
Аннотация:
A novel blue-emitting double-phosphate phosphor Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ was synthesized by the sol-gel method, and the structure and luminescence properties were investigated in detail. The crystal structure and chemical composition of Cs0.72Ca0.72Gd1.28(PO4)(2) matrix was analyzed and determined based on Rietveld refinements and phase and chemical composition analysis. The composition-optimized Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ exhibited strong blue light, peaking at 462 nm upon excitation at 365 nm with the CIE coordinates of (0.139, 0.091). The quenching concentration of Eu2+ in the Cs0.72Ca0.72Gd1.28(PO4)(2) phase was about 0.01 and attributed to the dipole-quadrupole interaction. The thermally stable luminescence properties, fluorescence decay curves and diffuse reflectance spectra of Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ phosphors are also discussed, all of which indicate that the Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ phosphor is a promising phosphor for application in white-light UV LEDs.
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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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16.
Formation, characterization and
magnetic properties of maghemite γ-Fe2O3 nanoparticles in borate glasses / I. S. Edelman [et al.]> // J. Alloys Compd. - 2015. -
Vol. 624
. - P. 60-67,
DOI
10.1016/j.jallcom.2014.11.059. - Cited References: 25. - This work was supported partly by the Russian Foundation for Basic Research - Russia, Grant No. 14-02-01211-a and by the President of Russia Grant No. NSh-2886.2014.2. This work was performed using the equipment of Unique Scientific Facility "Kurchatov Synchrotron Radiation Source'' supported by the Russian Ministry of Science and Education (project code RFMEFI61914X0002). . - ISSN 0925-8388
РУБ
Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
SUPERPARAMAGNETIC RESONANCE
HYSTERESIS LOOPS
EXCHANGE BIAS
IONS
MATRIX
Кл.слова (ненормированные):
Nanostructures
--
Crystal structure and symmetry
--
Magnetic measurements
Аннотация:
A new type of nanocomposite materials based on maghemite, γ-Fe2O3, nanoparticles dispersed in borate glasses co-doped with low contents of iron together with the larger radius element combinations: Y and Bi, or Sm and Pb, or Y and Pb is studied. Nanoparticles arise as a result of heat treatment of the glasses which gives them properties characteristic of magnetically ordered substances. Transmission electron microscopy and XRD show that only one magnetic phase, namely γ-Fe2O3 nanoparticles, occurs in glasses subjected to the thermal treatment at 540 °C during 24 h independently on the doping element nature. At the same time doping element and their concentrations ratio in every combination affect the particles average size and glass magnetic properties, such as magnetization temperature dependences, Faraday rotation value and electron magnetic resonance spectrum characteristics.
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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660036, Russia
NRC Kurchatov Inst, Moscow 123182, Russia
RAS, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia
Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Tarasov, I. A.; Тарасов, Иван Анатольевич; Zubavichus, Y. V.; Trofimova, N. N.; Zaikovskii, V. I.; Russian Foundation for Basic Research - Russia [14-02-01211-a]; President of Russia [NSh-2886.2014.2]; Russian Ministry of Science and Education [RFMEFI61914X0002]
}
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17.
Engineering oxygen vacancies
towards self-activated BaLuAlxZn4-xO7-(1-x)/2 photoluminescent materials: An experimental and theoretical analysis / L. Ma [et al.]> // Phys. Chem. Chem. Phys. - 2015. -
Vol. 17
,
Is. 46
. - P. 31188-31194,
DOI
10.1039/c5cp05130d. - Cited References: 28. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51572023, 51272242 and 51511130035), and Fundamental Research Funds for the Central Universities (FRF-TP-15-005A1). The author A. H. Reshak would like to acknowledge the CENTEM project, reg. no. CZ.1.05/2.1.00/03.0088, cofunded by the ERDF as part of the Ministry of Education, Youth and Sports OP RDI programme and, in the follow-up sustainability stage, supported through CENTEM PLUS (LO1402) by financial means from the Ministry of Education, Youth and Sports under the National Sustainability Programme I. Computational resources were provided by MetaCentrum (LM2010005) and CERIT-SC (CZ.1.05/3.2.00/08.0144) infrastructures. SA would like to thank CSIR-NPL and Physics Department IIT Delhi for financial support. This work was partly supported by the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). VVA was partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 1463-9076
Перевод заглавия:
Разработка кислородных вакансий для самоактивируемых люминесцентных материалов BaLuAlxZn4-xO7-(1-x)/2: экспериментальный и теоретический анализ
РУБ
Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
PHOSPHOR
LUMINESCENCE
EVOLUTION
OXIDES
IONS
Аннотация:
Novel self-activated yellow-emitting BaLuAlxZn4-xO7-(1-x)/2 photoluminescent materials were investigated by a combined experimental and theoretical analysis. The effects of Al/Zn composition modulation, calcination atmosphere and temperature on the crystal structure and photoluminescence properties have been studied via engineering oxygen vacancies. Accordingly, BaLuAl0.91Zn3.09O7 prepared in an air atmosphere was found to be the stable crystalline phase with optimal oxygen content and gave a broad yellow emission band with a maximum at 528 nm. The self-activated luminescence mechanism is ascribed to the O-vacancies based on the density functional theory (DFT) calculation. A theoretical model originating from the designed oxygen vacancies has been proposed in order to determine the influence of O-vacancies on the band structure and self-activated luminescence. Therefore, the appearance of a new local energy level in the band gap will cause the wide-band optical transitions in the studied BaLuAlxZn4-xO7-(1-x)/2 materials.
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School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk, Russian Federation
Functional Electronics Laboratory, Tomsk State University, Tomsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Council of Scientific and Industrial Research-National Physical Laboratory Dr K S Krishnan Marg, New Delhi, India
Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi, India
New Technologies-Research Centre, University of West Bohemia, Univerzitni 8, Pilsen, Czech Republic
Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, Kangar, Perlis, Malaysia
Доп.точки доступа:
Ma, L.; Xia, Z.; Atuchin, V. V.; Атучин, Виктор Валерьевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Auluck, S.; Reshak, A. H.; Liu, Q.
}
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18.
Effects of composition
modulation on the luminescence properties of Eu3+ doped Li1-xAgxLu(MoO4)2 solid-solution phosphors / F. Cheng [et al.]> // Dalton Trans. - 2015. -
Vol. 44
,
Is. 41
. - P. 18078-18089,
DOI
10.1039/c5dt02760h. - Cited References: 42. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51272242, 51572023, 51511130035), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (RERU2015022), and the excellent tutor section of the Fundamental Research Funds for the Central Universities of China University of Geosciences, Beijing (2-9-2015-028). This work was also partly supported by the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). . - ISSN 1477-9226
Перевод заглавия:
Влияние модуляции состава на люминесцентные свойства твердотельного люминофора Li1-xAgxLu(MoO4)2 допированного Eu3+
РУБ
Chemistry, Inorganic & Nuclear
Рубрики:
RED PHOSPHORS
PHOTOLUMINESCENCE PROPERTIES
ENERGY-TRANSFER
WHITE LEDS
IONS
NA
POLYMORPHISM
TUNGSTATES
RELAXATION
MOLYBDATES
Аннотация:
Double molybdate scheelite-type solid-solution phosphors Li1−xAgxLu1−y(MoO4)2:yEu3+ were synthesized by the solid state reaction method, and their crystal structures and luminescence properties were investigated in detail. The composition modulation and structural evolution of this series of samples were studied and the selected AgEu(MoO4)2, AgLu(MoO4)2, LiLu(MoO4)2 and LiEu(MoO4)2 phases were analyzed based on the Rietveld refinement. Depending on the variation of the Li/Ag ratio in Li1−xAgxLu1−y(MoO4)2:yEu3+ phosphors, the difference in the luminescence properties of Li1−xAgxLu1−y(MoO4)2:yEu3+ phosphors was ascribed to two factors, one reason could be assigned to the coupling effect and the nonradiative transition between the energy levels of LixAg1−xLu(MoO4)2 matrices and the activator Eu3+, another could be due to the near ultraviolet energy absorption and transmission efficiency between the charge-transfer (CT) band of O2−–Mo6+ and the 4f → 4f emissive transitions of Eu3+. The ultraviolet-visible diffuse reflection spectra (UV-vis DRS) and Raman spectra analysis were also used to verify the above mechanism.
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Держатели документа:
School of Materials Sciences and Technology, China University of Geosciences, Beijing, China
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
Доп.точки доступа:
Cheng, F.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Jing, X.
}
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19.
Data-driven photoluminescence tuning
in Eu2+-doped phosphors / S. Lai, M. Zhao, J. Qiao [et al.]> // J. Phys. Chem. Lett. - 2020. -
Vol. 11
,
Is. 14
. - P. 5680-5685,
DOI
10.1021/acs.jpclett.0c01471. - Cited References: 34. - The present 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), 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. 19-52-80003 . - ISSN 1948-7185
Перевод заглавия:
Настройка фотолюминесценции люминофоров, легированных Eu2+, за счет анализа базы данных
Рубрики:
Phosphors
Luminescence properties
Crystal structure
Ions
Quantum mechanics
Аннотация:
Discovery of rare earth phosphors has generally relied on the chemical intuition and time-intensive trial-and-error synthesis; therefore, finding new materials assisted by data-driven computations is urgent. Herein, we utilize a regression model to predict the emission wavelengths of Eu2+-doped phosphors by revealing the relationships between the crystal structure and luminescence property. The emission wavelengths of [Rb(1–x)K(x)]3LuSi2O7:Eu2+ (0 ≤ x ≤ 1) phosphors, as examples for the data-driven photoluminescence tuning, are successfully predicted on the basis of the existing data of only eight systems, also consistent with the experimental results. These phosphors can be excited by blue light and exhibit broad-band red and near-infrared emission ranging from 619 to 737 nm. These findings in Eu2+-doped silicate phosphors indicate that data-driven computations through the regression mode would have bright application in discovering novel phosphors with a target emission wavelengths.
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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, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology BeijingBeijing 100083, 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
Department of Physics, Far Eastern State Transport University, Russian Federation
Доп.точки доступа:
Lai, S.; Zhao, M.; Qiao, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.
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20.
Crystal structure and
luminescence properties of novel Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphor with apatite structure / Q. F. Guo [et al.]> // Ceram. Int. - 2016. -
Vol. 42
,
Is. 10
. - P. 11687-11691,
DOI
10.1016/j.ceramint.2016.04.086. - Cited References:26. - This present work is supported by the National Natural Science Foundation of China (Grant no. 41172053). . - ISSN 0272-8842. - ISSN 1873-3956
Перевод заглавия:
Кристаллическая структура и люминесцентные свойства нового люминофора Sr10-x(SiO4)3(SO4)3O:xEu2+ со структурой апатита
РУБ
Materials Science, Ceramics
Рубрики:
Light-Emitting-Diodes
Energy-transfer
Tunable phosphor
LEDs
Eu-2+
Ions
Ce3+
Кл.слова (ненормированные):
Crystal structure
--
Apatite
--
Phosphor
Аннотация:
In this paper, a series of novel luminescent Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors with apatite structure were synthesized by a high temperature solid-state reaction. The phase structure, photoluminescence (PL) properties, as well as the PL thermal stability were investigated. Sr9.92(SiO4)3(SO4)3O:0.08Eu2+ phosphor exhibits better thermal quenching resistance, retaining the luminance of 66.55% at 150 °C compared with that at 25 °C. The quenching concentration of Eu2+ in Sr10(SiO4)3(SO4)3O was about 0.08 (mol) with the dipole–quadrupole interaction. The Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors exhibited a broad-band green emission at 538 nm upon excitation at 396 nm. The results indicate that Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors have potential applications as near UV-convertible phosphors for white-light UV LEDs.
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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, Peoples R China.
SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Доп.точки доступа:
Guo, Q. F.; Ma, B.; Liao, L. B.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mei, L. F.; Liu, H. K.
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