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    Electronic states of the iron ions in the oxygen deficient perovskite Gd0.2Sr0.8FeO3-δ / Yu. V. Knyazev [и др.] // Мёссбауэровская спектроскопия и её применения : сб. материалов XV международной конференции. - Ростов-на-Дону, 2018. - С. 45 . - ISBN 978-5-9275-2831-8
   Перевод заглавия: Электронные состояния ионов железа в перовските Gd0.2Sr0.8FeO3-δ

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Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Solovyov, L. A.; Соловьев, Леонид Александрович; Verechschagin, S. N.; Burkov, A. T.; Novikov, S. V.; Мёссбауэровская спектроскопия и её применения, международная конференция(15 ; 2018 ; сент ; 10-16 ; Сочи); Mössbauer Spectroscopy and Applications, International Conference(15 ; 2018 ; Sept. ; 10-16 ; Sochi); Южный федеральный университет; МИРЭА-Российский технологический университет; Российская академия наук; Институт кристаллографии им. А.В. Шубникова РАН; Федеральный научно-исследовательский центр "Кристаллография и фотоника" РАН; Московский государственный университет им. М.В. Ломоносова
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    Photoluminescence tuning in a novel Bi3+/Mn4+ co-doped La2ATiO6:(A = Mg, Zn) double perovskite structure: Phase transition and energy transfer / G. Xing [et al.] // J. Mater. Chem. C. - 2018. - Vol. 6, Is. 48. - P. 13136-13147, DOI 10.1039/c8tc05171b. - Cited References: 60. - This work was supported by the National Natural Science Foundation of China (Grant No. 51672259, 51672265, 21521092, 51750110511), the Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences (Wuhan) (No. NGM2016KF002), the Key Research Program of Frontier Sciences, CAS (Grant No. YZDYSSW-JSC018), and the projects for science and technology development plan of Jilin province (20170414003GH), the Program for Jiangmen Innovative Research Team (No. [2017]385), and the major program of basic research and applied research of Guangdong Province (2017KZDXM083). . - ISSN 2050-7534
   Перевод заглавия: Управление люминесценцией в новой структуре двойного перовскита La2ATiO6:(A = Mg, Zn) допированным Bi3+/Mn4+: фазовый переход и перенос энергии
Кл.слова (ненормированные):
Crystal symmetry -- Energy transfer -- Light -- Luminescence -- Perovskite -- Phosphors -- Rietveld refinement
Аннотация: Red-emitting phosphors are indispensable compounds which are used to achieve a warm white light in phosphor-converted white light emitting diodes (pc-WLEDs). However, the luminous efficiency and stability of red phosphors are still big challenges. In this work, we developed red-emitting double perovskite phosphors La2ATiO6:Bi3+,Mn4+ (A = Mg, Zn) (LAT:Bi3+,Mn4+) and discuss the relationship between the double perovskite phosphor structure and the luminescence performance in detail. According to the Rietveld refinement results for the La2Mg(1−w)ZnwTiO6:Bi3+,Mn4+ (0 ≤ w ≤ 1) (LM(1−w)ZwT:Bi3+,Mn4+) solid solution, the proposed mechanism of the spectral adjustment is ascribed to the appearance of the phase transition, which results in a lower local structural symmetry of the [LaO12] polyhedron and the variation of the crystal field environment for Mn4+. Notably, this is the first time that the influence of the local structure variation on the luminescence tuning in double perovskite structure phosphors has been revealed, and this could offer guidance for the development of new phosphor system. By designing Mg2+/Zn2+ cation substitution, the internal quantum efficiency (IQE) is remarkably enhanced beyond 20%. In addition, we succeeded in achieving a Bi3+/Mn4+ co-doped energy transfer in the double perovskite structure phosphors. Owing to the Bi3+ → Mn4+ energy transfer in LAT, the red emission of the Mn4+ ions could be dramatically enhanced. The energy transfer efficiency of LAT:Bi3+,Mn4+ eventually exceeded 90%. The IQE and the thermal stability were all enhanced by around 30% compared to the non-co-doped samples, respectively. These results indicate that the Bi3+ → Mn4+ energy transfer strategy could play a pivotal role in the development of highly efficient red-emitting phosphors. The performance of the fabricated pc-WLEDs devices indicates that LAT:Bi3+,Mn4+ could be a promising red phosphor for near ultraviolet (n-UV) based warm pc-WLEDs.

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Держатели документа:
Engineering Research Center of Nano-Geomaterials, Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong, 529020, China

Доп.точки доступа:
Xing, G.; Feng, Y.; Pan, M.; Wei, Y.; Li, G.; Dang, P.; Liang, S.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Cheng, Z.; Lin, J.
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    Верещагин, Сергей Николаевич.
    Применение ТГ/ДСК-анализа c программированным составом газовой фазы для изучения фазового перехода порядок-беспорядок в нестехиометрическом Sr-Dy-кобальтате / С. Н. Верещагин, В. А. Дудников, Ю. С. Орлов // J. Sib. Fed. Univ. Chem. - 2018. - Vol. 11, Is. 4. - P. 507-517 ; Журн. СФУ. Химия, DOI 10.17516/1998-2836-0095. - Библиогр.: 17. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда науки в рамках научного проекта No 18-42-243004 и проекта фундаментальных исследований СО РАН V.45.3.3. . - ISSN 1998-2836. - ISSN 2313-6049
   Перевод заглавия: Application of TG/DSC analysis under variable gas phase composition to study order-disorder transition in nonstoichiometric Sr-Dy-cobaltate

РУБ Chemistry, Multidisciplinary
Рубрики:
PEROVSKITE
OXYGEN
Кл.слова (ненормированные):
перовскит -- порядок-беспорядок -- фазовый переход -- ТГ -- ДСК -- perovskite -- order-disorder -- phase transition -- TG -- DSC
Аннотация: Методом термического анализа (ТГ/ДСК) в условиях постоянного и программированного состава газовой фазы изучено влияние скорости закалки на полноту перехода кубического разупорядоченного нестехиометрического перовскита (I) Sr(0.8)Dy(0.2)CoO(3-d) в тетрагональную модификацию (II) с упорядоченным расположением катионов Sr/Dy и анионных вакансий, а также взаимосвязь степени превращения I в II с количеством мобильного кислорода и его энергетическими характеристиками. Показано, что фазовое превращение протекает как фазовый переход первого рода, процесс образования структуры II контролируется кинетическими факторами, а использование скоростей охлаждения 3-99 К/мин позволяет получить образцы, формально соответствующие 98-30 % превращению I в II; при этом как количество подвижного кислорода, так и энтальпия его удаления из образца нелинейно зависят от полноты перехода I в II.
For the first time a method of TG/DSC analysis under constant and variable gas phase composition was applied to reveal interconnection between quenching ramp rates and degree of phase transformation of cubic nonstoichiometric disordered perovskite (I) Sr(0.8)Dy(0.2)CoO(3-d) to tetragonal structure (II) with ordered Sr/Dy cations and anion vacancies. It was shown that the transformation is a first order phase transition and the ordering process is kinetically controlled. Based on the experimental transition enthalpy it was found that a formal conversion degree of I to II was 98-30% under cooling ramp rates 3-99 K/min. Non-linear relationship between the completeness of I-to-II transformation and mobile oxygen characteristics (content and the enthalpy of O-removal) was demonstrated.

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Держатели документа:
SB RAS, FRC Krasnoyarsk Sci Ctr, Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia.
SB RAS, FRC Krasnoyarsk Sci Ctr, Kirensky Inst Phys, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Дудников, Вячеслав Анатольевич; Dudnikov, V. A.; Орлов, Юрий Сергеевич; Orlov, Yu. S.; Vereshchagin S. N.

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    Two-dimensional-layered perovskite ALaTa2O7:Bi3+ (A = K and Na) phosphors with versatile structures and tunable photoluminescence / G. J. Zhou [et al.] // ACS Appl. Mater. Interfaces. - 2018. - Vol. 10, Is. 29. - P. 24648-24655, DOI 10.1021/acsami.8b08129. - Cited References: 48. - The authors acknowledge the support from the National Natural Science Foundation of China (Nos. 51722202, 91622125, and 51572023) and the Natural Science Foundations of Beijing (2172036) and RFBR (17-52-53031). . - ISSN 1944-8244
   Перевод заглавия: 2D-слоистые перовскитоподобные люминофоры ALaTa2O7:Bi3+ (A = K and Na) с разнообразными структурами и управляемой люминесценцией.

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
GENERALIZED GRADIENT APPROXIMATION
YELLOW-EMITTING PHOSPHOR
Кл.слова (ненормированные):
2D-layered perovskite -- Bi3+ emission -- ion exchange -- photoluminescence tuning -- white light LEDs
Аннотация: Topological chemical reaction methods are indispensable for fabricating new materials or optimizing their functional properties, which is particularly important for two-dimensional (2D)-layered compounds with versatile structures. Herein, we demonstrate a low-temperature (∼350 °C) ion exchange approach to prefabricate metastable phosphors ALa1–xTa2O7:xBi3+ (A = K and Na) with RbLa1–xTa2O7:xBi3+ serving as precursors. The as-prepared ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) share the same Dion–Jacobson type 2D-layered perovskite phase, and photoluminescence analyses show that ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) phosphors exhibit broad emission bands peaking at 540, 550, and 510 nm, respectively, which are attributed to the nonradiative transition of Bi3+ from excited state 3P1 or 3P0 to ground state 1S0. The various Bi3+ local environments at the crystallographic sites enable the different distributions of emission and excitation spectra, and the photoluminescence tuning of ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) phosphors are realized through alkali metal ion exchange. Notably, the combination of superior trivalent bismuth emission and low-temperature ion exchange synthesis leads to a novel yellow-emitting K(La0.98Bi0.02)Ta2O7 phosphor which is successfully applied in a white LED device based on a commercially available 365 nm LED chip. Our realizable cases of this low-temperature ion exchange strategy could promote exploration into metastable phosphors with intriguing properties.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
SB RAS, KSC, Fed Res Ctr, Kirensky Inst Phys,Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Zhou, Guojun; Jiang, Xingxing; Zhao, Jing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, Zheshuai; Liu, Quanlin; Xia, Zhiguo
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    Верещагин, Сергей Николаевич.
    Изучение подвижного кислорода в упорядоченном/разупорядоченном нестехиометрическом кобальтате Sr-Gd методом синхронного термического анализа / С. Н. Верещагин, В. А. Дудников, Л. А. Соловьев // Журн. СФУ. Химия. - 2017. - Т. 10, № 3. - С. 346-357 ; J. Sib. Fed. Univ. Chem. - 2017, DOI 10.17516/1998-2836-0031. - Библиогр.: 19 . - ISSN 1998-2836. - ISSN 2313-6049
   Перевод заглавия: Study of mobile oxygen in ordered/disordered nonstoichiometric Sr-Gd-cobaltate by simultaneous thermal analysis
Кл.слова (ненормированные):
разупорядоченный перовскит -- кобальтат -- ДСК -- ТГ -- кристаллическая структура -- подвижный кислород -- disordered perovskite -- cobaltate -- DSC -- TG -- crystal structure -- mobile oxygen
Аннотация: Методом синхронного термического анализа (ДСК/ТГ/масс-спектрометрия) при переменном парциальном давлении кислорода изучены разупорядоченная кубическая и упорядоченная по А-позициям тетрагональная фазы Sr-Gd-кобальтата (Sr/Gd=4). Показано, что упорядочение А-катионов приводит к снижению энтальпии отщепления О2, преимущественной локализации образовавшейся вакансии в одной из четырёх неэквивалентных позиций аниона О2- и снижению количества подвижного кислорода, удаляемого при изменении парциального давления О2. Наблюдаемые различия в свойствах мобильного кислорода и каталитической активности в реакции глубокого окисления метана для упорядоченной/разупорядоченной фазы перовскита обсуждены с позиций изменения доли анионов О2- с различным локальным окружением, содержащим от 0 до 4 катионов гадолиния.
Simultaneous thermal analysis (DSC/TG/mass-spectroscopy) under variable pressure was applied to study properties of mobile oxygen in cubic disordered and tetragonal A-site ordered Sr-Gd-cobaltate (Sr/Gd=4). It was shown that A-site cation ordering results in a decrease of an enthalpy of oxygen elimination, predominant localization of created anion vacancies only at one of four unequivalent crystallographic O-sites and depletion of amount of mobile oxygen, which can be removed at a reduced pressure. The observed properties of mobile oxygen and catalytic activity in reaction of methane deep oxidation for ordered/disordered perovskite phases are discussed in connection with a local environment of O2- crystallographic sites with a different number of Gd3+ cations nearby.

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Держатели документа:
RAS, SB, Inst Chem & Chem Technol, FRC Krasnoyarsk Sci Ctr, 50-24 Akad Gorodok, Krasnoyarsk 660036, Russia.
RAS, SB, Kirensky Inst Phys, 50-38 Akad Gorodok, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Дудников, Вячеслав Анатольевич; Dudnikov, V. A.; Соловьев, Леонид Александрович

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    Aleksandrov, K. S.
    Phase transition due to octahedral tilts in several families of crystals related to perovskite / K. S. Aleksandrov // Journal of the Physical Society of Japan. - 1980. - Vol. 49, Supplement B. - P. 60-63 . - ISSN 0031-9015
   Перевод заглавия: Фазовые переходы в семействах кристаллов, родственных перовскиту

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Доп.точки доступа:
Александров, Кирилл Сергеевич; Japanese-Soviet symposium on ferroelectricity(2 ; 1980 ; Sept. 6-11 ; Kyoto, Japan)Советско-японский симпозиум по сегнетоэлектричеству(2 ; 1980 ; 6-11 сент. ; Киото, Япония)
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Nemtsev, A. V.
Ab initio study of the polarization, electronic, magnetic, and optical properties of perovskite SrMO3 (M = Fe, Mn) crystals and thin films containing magnetic ions / A. V. Nemtsev, V. S. Zhandun, V. I. Zinenko // J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 4. - P. 497-505, DOI 10.1134/S1063776118030056. - Cited References: 30 . - ISSN 1063-7761
Кл.слова (ненормированные):
Antiferromagnetism -- Density functional theory -- Electronic properties -- Iron compounds -- Manganese compounds -- Optical properties -- Perovskite -- Perovskite solar cells -- Polarization -- Strontium compounds
Аннотация: The magnetic, electronic, and polarization properties of the SrFeO3 and SrMnO3 compounds with a perovskite structure are calculated using the density functional theory in the bulk and thin-film states. A ferroelectric instability is found to be absent in the bulk state, and the polar mode is softened in the thin-film state of SrMnO3 in the presence of tensile stresses in the substrate. As a result, a polar phase with a polarization of 23 μC/cm2 appears, which agrees with experimental data. The study of the magnetic and electronic properties demonstrates the existence of G-type antiferromagnetic ordering in SrMnO3 and the appearance of a dielectric gap of about 1.5 eV in its thin film. A ferromagnetic phase with metallic conduction in both the bulk and thin-film states is detected in SrFeO3.

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Публикация на русском языке Немцев, Андрей В. Исследования ab initio электронных, магнитных и оптических свойств кристаллов и тонких пленок перовскитов SrMeOs (Me = Fe, Mn), содержащих магнитные ионы [Текст] / А. В. Немцев, В. С. Жандун, В. И. Зиненко // Журн. эксперим. и теор. физ. - 2018. - Т. 153 Вып. 4. - С. 605-614

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Zinenko, V. I.; Зиненко, Виктор Иванович; Немцев, Андрей В.
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Is There Any Hidden Symmetry in the Stripe Structure of Perovskite High-Temperature Superconductors? / V. A. Gavrichkov [et al.] // J. Phys. Chem. Lett. - 2019. - Vol. 10, Is. 8. - P. 1840-1844, DOI 10.1021/acs.jpclett.9b00513. - Cited References: 68. - One of the authors (V.A.G.) is grateful to RFBR, the Government of the Krasnoyarsk Region and Krasnoyarsk Regional Fund of Science for the research Grant No. 18-42-240017 . - ISSN 1948-7185

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Atomic, Molecular & Chemical
Рубрики:
T-C
   CUO2 PLANE
   INHOMOGENEOUS SUPERCONDUCTIVITY
   PHASE-DIAGRAM
Аннотация: Local and fast structural probes using synchrotron radiation have shown nanoscale striped puddles and nanoscale phase separation in doped perovskites. It is known that the striped phases in doped perovskites are due to competing interactions involving charge, spin, and lattice degrees of freedom. In this work, we show that two different stripes can be represented as a superposition of a pair of stripes, U(θn) or D(θn), characterized by perovskite tilts where one of the pair is rotated in relation to the other partner by an angle Δθn = π/2. The spatial distribution of the U and D stripes is reduced to all possible maps in the well-known mathematical four-color theorem. Both the periodic striped puddles and random structures can be represented by using planar graphs with a chromatic number χ ≤ 4. To observe the colors in mapping experiments, it is necessary to recover variously oriented tilting effects from the replica. It is established that there is an interplay between the annihilation/creation of new stripes and ordering/disordering tilts in relation to the θn angle in the CuO2 plane, where the characteristic shape of the stripes coincides with the tilting-ordered regions.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, KSC Siberian Branch, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Inst Computat Modeling, Krasnoyarsk 660036, Russia.
Rome Int Ctr Mat Sci Superstripes RICMASS, Via Sabelli 119A, I-00185 Rome, Italy.
CNR, Inst Cristallog, I-00015 Monterotondo, Italy.
Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow 115409, Russia.

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Shan'ko, Yury; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Bianconi, A.; RFBR [18-42-240017]; Government of the Krasnoyarsk Region [18-42-240017]; Krasnoyarsk Regional Fund of Science [18-42-240017]
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    Structural, Magnetic, and Thermodynamic Properties of Ordered and Disordered Cobaltite Gd0.1Sr0.9CoO3 – δ / V. A. Dudnikov [et al.] // J. Exp. Theor. Phys. - 2019. - Vol. 128, Is. 4. - P. 630-640, DOI 10.1134/S1063776119020171. - Cited References: 27. - This work was supported by the Russian Foundation for Basic Research (grant nos. 17-02-00826, 16-02-00507, and 18-52-00017 Bel_a) and by the Council on Grants of the President of the Russian Federation (SP-1844.2016.1). X-ray spectra were recorded using the equipment of a unique scientific facility Kurchatov Synchrotron Radiation Source financed by the Ministry of Education and Science of the Russian Federation (project ID RFMEFI61917X0007). . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
PROFILE REFINEMENT
   PHASE-TRANSITION
   OXYGEN SORPTION
   PEROVSKITE
Аннотация: The effect of cationic and anionic orderings on the crystal structure and magnetic properties of substituted rare-earth cobaltites Gd0.1Sr0.9CoO3 – δ was studied using X-ray diffraction, measurement of XANES spectra, and magnetic and thermodynamic characteristics. The effects of ordering cause a decrease in symmetry to tetragonal and a distortion of the coordination octahedra of CoO6. Anomalous magnetic and thermodynamic quantities are observed at 260 and 360 K, respectively, for disordered and ordered samples. The XANES spectra measured at the CoK edge did not reveal a noticeable shift in the absorption edge compared with the spectrum of original GdCoO3. This suggests that the charge compensation process is associated not only with a change in the electronic state of cobalt ions, but also with the emergence of holes in the 2p states of oxygen.

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Публикация на русском языке Структурные, магнитные и термодинамические свойства упорядоченного и разупорядоченного кобальтита Gd0.1Sr0.9CoO3-δ [Текст] / В. А. Дудников [и др.] // Журн. эксперим. и теор. физ. - 2019. - Т. 155 Вып. 4. - С. 737-749

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia.
Natl Res Ctr, Kurchatov Inst, Moscow 123182, Russia.
Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, Minsk 220072, BELARUS.

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Kazak, N. V.; Казак, Наталья Валерьевна; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Vereshchagin, S. N.; Gavrilkin, S. Yu.; Tsvetkov, A. Yu.; Gorev, M. V.; Горев, Михаил Васильевич; Veligzhanin, A. A.; Trigub, A. L.; Troyanchuk, I. O.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [17-02-00826, 16-02-00507, 18-52-00017 Bel_a]; Russian Federation [SP-1844.2016.1]; Ministry of Education and Science of the Russian Federation [RFMEFI61917X0007]
}
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10.

    Optically Modulated Ultra-Broad-Band Warm White Emission in Mn2+-Doped (C6H18N2O2)PbBr4 Hybrid Metal Halide Phosphor / G. J. Zhou [et al.] // Chem. Mater. - 2019. - Vol. 31, Is. 15. - P. 5788-5795, DOI 10.1021/acs.chemmater.9b01864. - Cited References: 47. - This work is supported by the National Natural Science Foundation of China (nos. 51722202 and 51572023), Natural Science Foundations of Beijing (2172036), the Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and the Guangdong Provincial Science & Technology Project (no. 2018A050506004). . - ISSN 0897-4756. - ISSN 1520-5002
   Перевод заглавия: Оптически модулированное ультраширокополосное излучение теплого белого света в гибридном металл-галоидном люминофоре допированным Mn2 + (C6H18N2O2)PbBr4

РУБ Chemistry, Physical + Materials Science, Multidisciplinary
Рубрики:
LIGHT EMISSION
   PEROVSKITE NANOCRYSTALS
   ENERGY-TRANSFER
   STATE
   Br
Аннотация: Finding new low-dimensional metal halides with broad-band emission is attracting interest in single-component phosphor for white light-emitting diodes (WLEDs). The full-spectrum white light still remains a challenge as found in the two-dimensional hybrid material (C6H18N2O2)PbBr4 exhibiting the intrinsic free exciton (FE) and broad-band self-trap exciton (STE) emission upon 365 nm ultraviolet excitation, and a combined strategy has been proposed through doping the Mn2+ ions enabling a superposition of multiple emission centers toward the ultra-broad-band warm white light. The occupation of Mn2+ in (C6H18N2O2)PbBr4 has been discussed, and optical investigations verify that the warm white-light emission of Mn2+-doped (C6H18N2O2)PbBr4 originates from the coupling effects of the FE, STEs, and the 4T1–6A1 transition of the doped Mn2+. When the concentration of Mn2+ is 5%, the emission spectrum of the phosphor covers all visible-light areas with a full width at half maximum (FWHM) of about 230 nm. The high Ra (84.9) and warm light CCT (3577 K) values of the as-fabricated WLED lamp demonstrate that (C6H18N2O2)Pb1–xMnxBr4 can be promising as single-component white-light phosphor in solid-state lighting. Our work could provide a new understanding and perspective about hybrid metal halides for designing superior phosphor toward single-component white emission.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Sun Yat Sen Univ, Sch Mat Sci & Engn, Sch Chem,Minist Educ, Key Lab Bioinorgan & Synthet Chem,State Key Lab O, Guangzhou 510275, Guangdong, Peoples R China.
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Zhou, Guojun; Jiang, Xingxing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, Zheshuai; Zhao, Jing; Wang, Jing; Xia, Zhiguo
}
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11.

Preparation, phase evolution, and magnetic properties of lanthanum manganite perovskite powders synthesized by solid-state reaction / R. D. Ivantsov [et al.] // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст. C.P14. - P. 294-295. - Cited References: 6. - The reported study was carried out with the financial support of the Russian Foundation for Fundamental Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Territory Fund for Support of Scientific and Technical Activity in the framework of scientific Projects No. 18-43-243003 and No. 18-42-243011. The work is supported by the Special Program of the Ministry of Education and Science of the Russian Federation for the Siberian Federal University . - ISBN 978-5-9500855-7-4

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Tomsk State University of Control System & Radioelectronics, Tomsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Mikhailov, M. M.; Yurkin, G. Yu.; Юркин, Глеб Юрьевич; Edelman, I. S.; Эдельман, Ирина Самсоновна; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
Нет сведений об экземплярах (Источник в БД не найден)
}
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12.

    A novel red-emitting La2CaHfO6:Mn4+ phosphor based on double perovskite structure for pc-WLEDs lighting / G. C. Xing [et al.] // CrystEngComm. - 2019. - Vol. 21, Is. 23. - P. 3605-3612, DOI 10.1039/c9ce00556k. - Cited References: 47. - This work is financially supported by the National Natural Science Foundation of China (NSFC No. 51672259). . - ISSN 1466-8033
   Перевод заглавия: Новый красный люминофор La2CaHfO6: Mn4+ на основе структуры двойного перовскита для светодиодных ламп pc-WLED

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
LUMINESCENCE PROPERTIES
   ELECTRONIC-STRUCTURE
   OPTICAL-PROPERTIES
   SITE
Аннотация: Non-rare earth doped oxides with red emission are one of the current research hotspots for achieving the warm white light range in the phosphor converted white light emitting diodes (pc-WLEDs) field. In the current work, a novel Mn4+-activated La2CaHfO6 red phosphor is reported for the first time and its crystal structure is analyzed by Rietveld refinement. The photoluminescent properties of La2CaHfO6:Mn4+ are investigated in detail with the help of diffuse refletance spectroscopy, photoluminescence spectroscopy, and temperature-dependent PL spectroscopy. Based on the diffuse refletance spectra, the calculated optical band gap for La2CaHfO6 is 4.9 eV, indicating that La2CaHfO6 could be a suitable host for activators' doping. Under 380 nm near-ultraviolet (n-UV) light excitation, the as-prepared La2CaHfO6:Mn4+ displays intense red emission centered at 693 nm. Through an accurate calculation of Dq/B (2.47) and nephelauxetic effect β1 (0.949), the origination of strong crystal field (CF) and deep-red emission is demonstrated. By combining the representative La2CaHfO6:0.002Mn4+, blue BAM:Eu2+, and green (Ba,Sr)2SiO4:Eu2+ phosphors with a 380 nm UV chip to fabricate the pc-WLEDs device, a white light is obtained with low correlated color temperature (CCT = 5165 K) and high color rendering index (Ra = 87.8), demonstrating that the as-prepared La2CaHfO6:Mn4+ phosphors can be used as red-emitting candidate in pc-WLEDs lighting.

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Держатели документа:
China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China.
FRC KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Xing, Gongcheng; Feng, Yuxin; Gao, Zhiyu; Tao, Mengxuan; Wang, Hongquan; Wei, Y.i.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Li, Guogang
}
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13.

    Manipulation of Bi3+/In3+ Transmutation and Mn2+-Doping Effect on the Structure and Optical Properties of Double Perovskite Cs2NaBi1-xInxCl6 / J. Zhou [et al.] // Adv. Opt. Mater. - 2019. - Vol. 7, Is. 8. - Ст. 1801435, DOI 10.1002/adom.201801435. - Cited References: 51. - J.Z. and X.M.R. contributed equally to this work. The present work was supported by the National Natural Science Foundation of China (Grant Nos. 51722202, 51572023, and 91622125) and Natural Science Foundations of Beijing (2172036). X.W.Z. acknowledges the support from National Key R&D Program of China (Grant No. 2016YFB0700700). . - ISSN 2195-1071
   Перевод заглавия: Влияние перестановок Bi3+/In3+ и Mn2+ -допирования на структуру и оптические свойства двойного перовскита Cs2NaBi1-xInxCl6

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
HALIDE DOUBLE PEROVSKITE
   LEAD-FREE
   ENERGY-TRANSFER
   NANOCRYSTALS
   BR
Кл.слова (ненормированные):
band gap engineering -- halide double perovskites -- Mn2+ doping
Аннотация: The halide double perovskite family represented by A2(B+,B3+)X6 can overcome the lead toxicity and enable generally large band gap engineering via B/B sites' transmutation or exotic dopants to fulfill the emerging applications in the optoelectronic fields. Herein, the design and the experimental synthesis of a new family of Mn2+‐doped Cs2NaBi1‐xInxCl6 crystals with an intense orange‐yellow emission band are reported, and the phase formation stability is discussed via a combined experimental–theoretical approach. Depending on the manipulation of Bi3+/In3+ combination, the band gap increases with In3+ content, and a subsequent evolution from indirect to direct band gap is verified. First‐principles calculations and parity analyses indicate a parity forbidden effect on Cs2NaInCl6, and a combination effect of absorption on Cs2NaBi1‐xInxCl6 from both Cs2NaBiCl6 and Cs2NaInCl6. The associated Mn2+‐doped photoluminescence depending on the Bi3+/In3+ substitution is also addressed from the variation of the different Mn–Cl environment and neighboring‐cation effect.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen Key Lab Flexible Memory Mat & Devices, Shenzhen 518060, Peoples R China.
Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China.
KSC SB RAS, Fed Res Ctr, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Zhou, Jun; Rong, Ximing; Zhang, Peng; Molokeev, M. S.; Молокеев, Максим Сергеевич; Wei, Peijia; Liu, Quanlin; Zhang, Xiuwen; Xia, Zhiguo
}
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14.

    Unraveling the mechanochemical synthesis and luminescence in MnII-based two-dimensional hybrid perovskite (C4H9NH3)2PbCl4 / G. J. Zhou [et al.] // Sci. China Mater. - 2019. - Vol. 62, Is. 7. - P. 1013-1022, DOI 10.1007/s40843-018-9404-4. - Cited References: 40. - The present work was supported by the National Natural Science Foundation of China (91622125, 51722202 and 51572023) and the Natural Science Foundation of Beijing (2172036), and Molokeev M acknowledges the support of the Russian Foundation for Basic Research (17-52-53031). The DFT calculation was carried out at the National Supercomputer Center in Tianjin, and the calculations were performed on TianHe-1(A). . - ISSN 2095-8226. - ISSN 2199-4501
   Перевод заглавия: Открытие механохимического синтеза и люминесценции в двумерном гибридном перовските (C4H9NH3)2PbCl4 с допированием MnII

РУБ Materials Science, Multidisciplinary
Рубрики:
DOPANT ENERGY-TRANSFER
   EMISSION
   EXCITON
   MODEL
Кл.слова (ненормированные):
2D hybrid perovskite -- mechanochemical -- Mn-doping -- luminescence -- phosphor
Аннотация: The mechanochemical route is a facile and fast way and has received much attention for developing versatile advanced functional materials. Herein, we reported a mechanochemical synthesis for incorporating divalent manganese ions (MnII) into a two-dimensional (2D) hybrid perovskite (C4H9NH3)2PbCl4. The mild external stimuli originating from the grinding at room temperature enabled the formation of MnII-doped 2D hybrid perovskites, and rapidly changed the luminescence characteristics. The photoluminescence analyses show that the violet and orange emissions are attributed to (C4H9NH3)2Pb1–xMnxCl4 band-edge emission and the T1→6A1 transition of Mn2+ resulting from an efficient energy transfer process, respectively. Site preference and distribution of the doped Mn2+ cations on the locations of Pb2+ were analyzed. The formation energy calculated by the density functional theory (DFT) indicates that the Mn2+ ions can rapidly enter the crystal lattice due to the unique 2D crystal structure of the hybrid perovskite. Such a case of mechanochemical synthesis for the 2D hybrid perovskite motivates many novel emerging materials and the related applications.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Beihang Univ, Minist Educ, Sch Phys, Key Lab Micronano Measurement Manipulat & Phys, Beijing 100191, Peoples R China.
RAS, SB, KSC, Lab Crystal Phys,Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Zhou, Guojun; Guo, Shaoqiang; Zhao, Jing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Quanlin; Zhang, Junying; Xia, Zhiguo
}
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15.

    Lead-Free Perovskite Derivative Cs2SnCl6−xBrx Single Crystals for Narrowband Photodetectors / J. Zhou [et al.] // Adv. Opt. Mater. - 2019. - Vol. 7, Is. 10. - Ст. 1900139, DOI 10.1002/adom.201900139. - Cited References: 26. - J.Z., J.J.L., X.M.R. contributed equally to this work. The present work was supported by the National Natural Science Foundation of China (Grants 51722202, 91622125, 51572023, and 11774239), Natural Science Foundations of Beijing (2172036), and National Key R&D Program of China (grant no. 2016YFB0700700). . - ISSN 2195-1071
   Перевод заглавия: Бессвинцовые монокристаллы производного перовскита Cs2SnCl6-xBrx для узкополосных фотоприемников
Кл.слова (ненормированные):
band structure -- Cs2SnBr6 -- Cs2SnCl6 -- lead-free perovskite derivatives -- narrowband photodetection
Аннотация: Lead-free and stable Sn halide perovskites demonstrate tremendous potential in the field of optoelectronic devices. Here, the structure and optical properties of the “defect” perovskites Cs2SnCl6−xBrx are reported, as well as their use as photodetector materials. Millimeter‐sized Cs2SnCl6−xBrx single crystals are grown by the hydrothermal method, with the body color continuously changing from transparent to yellow and finally to dark red. Narrowband single‐crystal photodetectors using Cs2SnCl6−xBrx crystals are presented, which show a high detectivity of ≈2.71 × 1010 Jones, with narrowband photodetection (full‐width at half‐maximum ≈45 nm) and high ion diffusion barriers. Moreover, the response spectra are continuously tuned from near violet to orange depending on the variation of the bandgap of the single crystals by changing the halide compositions. The strong surface charge recombination of the excess carriers near the crystal surfaces produced by short wavelength light elucidates the narrowband photodetection behavior. This work provides a new paradigm in the design of lead‐free, stable, and high‐performance perovskite derivatives for optoelectronics applications.

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Держатели документа:
The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan, 430074, China
Shenzhen Key Laboratory of Flexible Memory Materials and Devices, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
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:
Zhou, J.; Luo, J.; Rong, X.; Wei, P.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Huang, Y.; Zhao, J.; Liu, Q.; Zhang, X.; Tang, J.; Xia, Z.
}
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16.

FLEROV, I. N.
EFFECT OF HYDROSTATIC-PRESSURE ON PHASE-TRANSITIONS IN PEROVSKITE-LIKE RBCL/CDCL2 CRYSTALS / I. N. FLEROV, M. V. GOREV // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 8. - P. 2555-2558. - Cited References: 14 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
RB2CDCL4

WOS

Доп.точки доступа:
GOREV, M. V.
}
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17.

MELNIKOVA, S. V.
ELECTROOPTICAL PROPERTIES OF SOME ABCL3 PEROVSKITE STRUCTURE TYPE CRYSTALS / S. V. MELNIKOVA, A. T. ANISTRATOV // Fiz. Tverd. Tela. - 1984. - Vol. 26, Is. 6. - P. 1906-1908. - Cited References: 6 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
ANISTRATOV, A. T.
}
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18.

Melnikova, S. V.
Thermodynamical description of O-H(1)-]G1-]G2-]G3 successive phase-transitions in ABCL3 perovskite structure crystals / S. V. Melnikova, I. N. Flerov, A. T. Anistratov // Fiz. Tverd. Tela. - 1981. - Vol. 23, Is. 12. - P. 3570-3575. - Cited References: 10 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Anistratov, A. T.; Мельникова, Светлана Владимировна
}
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19.

Aleksandrov, K. S.
Architecture of perovskite-like ferroelectrics and HT-supercoductors / K. S. Aleksandrov, B. V. Beznosikov // J. Korean Phys. Soc. - 1998. - Vol. 32: Suppl. - P. S1790-S1792. - Cited References: 7 . - ISSN 0374-4884

РУБ Physics, Multidisciplinary

Аннотация: Structures of the known perovskite-like crystals are considered as the systems of slabs containing n layers (n = 1, 2,..., infinity) vertices-linked octahedra BX6, pyramids BX5 or planar square nets BX4 (B - cation, X - anion) intergrowing with blocks of different types. Using these fragments whole variety of stoichiometric, cation-and anion-deficient structures can be constructed and many new perovskite-like layered crystals including ferroelectrics, ferroelastics and HTSC's may be found.

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Scopus

Доп.точки доступа:
Beznosikov, B. V.; Безносиков, Борис Валерьевич; Александров, Кирилл Сергеевич; International Meeting on Ferroelectricity(9 ; 1997 ; 25-29 Aug. ; Seoul, South Korea)
}
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20.

Malakhovskii, A. V.
Temperature dependence of the fine structure of the C and E absorption bands in RbMnF3 below the Neel temperature / A. V. Malakhovskii, T. P. Morozova // Phys. Solid State. - 2006. - Vol. 48, Is. 2. - P. 283-290, DOI 10.1134/S1063783406020156. - Cited References: 24 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE FLUORIDES
   VIBRONIC SPECTRA
   CRYSTALS
   MNF2
   INTENSITY
   DICHROISM
   STATES
Аннотация: The variation in the parameters (width, position, intensity) of the fine structure lines in the C[(6)A(1g) - (4)A(1g), E-4(g)((4)G)] and E[(6)A(1g) - E-4(g)(D-4)] bands in RbMnF3 with temperature is studied in the temperature range 10-70 K. In the C band, two narrow ( 6 cm(-1)) lines are are distinguished at distances of 77 and 80 cm(-1) from the exciton line at T

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Morozova, T. P.; Малаховский, Александр Валентинович
}
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