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New symmetric families of silicon quantum dots and their conglomerates as a tunable source of photoluminescence in nanodevices / Avramov P.V., Fedorov D.G., Sorokin P.B., Chernozatonskii L.A., Gordon M.S. // arXiv. - 2008. - Ст. 0709.2279v1

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Доп.точки доступа:
Avramov, P.V.; Fedorov, D.G.; Sorokin, P. B.; Chernozatonskii, L.A.; Gordon, M.S.
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    Strong Electron Correlations Determine Energetic Stability and Electronic Properties of Er-Doped Goldberg-Type Silicon Quantum Dots / P. V. Avramov [et al.] // J. Phys. Chem. C. - 2009. - Vol. 113, Is. 36. - P. 15964-15968, DOI 10.1021/jp904996e. - Cited Reference Count: 43. - Гранты: This work was supported by a CREST (Core Research for Evolutional Science and Technology) grant in the Area of High Performance Computing for Multiscale and Multiphysics Phenomena from the Japan Science and Tcchnology Agency (JST) and a collaborative RFBR-JSPS Grant 0902-92107-Phi. One of the authors (S.I.) also acknowledges support by the Program for Improvement of Research Environment for Young Researchers from Special Coordination Funds for Promoting Science and Technology (SCF) commissioned by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. - Финансирующая организация: Japan Science and Tcchnology Agency (JST); RFBR-JSPS Grant; Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan . - SEP 10. - ISSN 1932-7447
Рубрики:
IMPLANTED POROUS SILICON
   AUGMENTED-WAVE METHOD
   MU M LUMINESCENCE
   SI NANOCRYSTALS
   THIN-FILMS
   BASIS-SET
   ERBIUM
   PHOTOLUMINESCENCE
   DENSITY
   PSEUDOPOTENTIALS
Кл.слова (ненормированные):
Ab initio -- Atomic structure -- Density functionals -- Empirical pseudo-potential -- Endohedrals -- Energetic stability -- Er-doped -- Erbium complexes -- Erbium ion -- Experimental data -- Hartree-fock -- Many body perturbation theory -- Mass centers -- Perturbation approach -- Plane wave -- Pseudopotentials -- Quantum Dot -- Silicon quantum dots -- Strong binding -- Strong electron correlations -- Theoretical result -- Crystal atomic structure -- Electron correlations -- Electron density measurement -- Electronic properties -- Electronic structure -- Erbium -- Perturbation techniques -- Structural optimization -- Semiconductor quantum dots
Аннотация: Atomic and electronic structures of Goldberg-type silicon quantum dots and their endohedral erbium complexes were studied using ab initio and plane wave pseudopotential density functional and Moller-Plesset many-body perturbation theories. During atomic structure optimizations, the erbium ions occupy mass centers inside the central hollows of quantum dots of different symmetries. It was found that strong electron correlations within the Er 4f shell taken into account by empirical pseudopotential and post-Hartree-Fock perturbation approaches are responsible for strong binding of Er ions to quantum dots. We elucidate the effects of symmetry and discuss theoretical results in comparison to available experimental data,

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Natl Inst Adv Ind Sci & Technol, RICS, Tsukuba, Ibaraki 3058568, Japan
Nagoya Univ, Inst Adv Res, Nagoya, Aichi 4648602, Japan
Nagoya Univ, Dept Chem, Nagoya, Aichi 4648602, Japan
Kyoto Univ, Fukui Inst Fundamental Chem, Sakyo Ku, Kyoto 6068103, Japan

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Kuzubov, A. A.; Кузубов, Александр Александрович; Fedorov, D. G.; Irle, S.; Morokuma, K.
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    Synthesis, structural and photoluminescence properties of Ca2Al3O6F:Eu2+ phosphor / Zhiguo Xia [et al.] // 3 Int. Conf. on the Advancement of Mater. and Nanotechn. (ICAMN 2013) : Programme and abstracts book. - 2013. - P. 109
   Перевод заглавия: Синтез, структурные и люминесцентные свойства Ca2Al3O6F:Eu2+ люминофора
Кл.слова (ненормированные):
Ca2Al3O6 -- Structure -- Spectroscopic properties
Аннотация: The Ca2A13O6F oxyfluoride was recently proposed as an efficient host for the luminescence materials; however the crystal structure remains to be unknown. We present a combined structural analysis on the powder sample of Ca2Al3O6F using X-ray diffraction (XRD), Raman and Infrared spectroscopy technique. XRD studies showed that the structure of crystallized in the rhombohedral system, R3 space group. The crystal structure consists of almost ideal AlO4 tetrahedrons, linked through corners, Ca ions in voids, and F disordered to 18 sites around Ca2 ion. Calculated Raman and infrared phonon modes agree qualitatively well with the experimental data. Lattice dynamics simulation based on the simplified version of the Born-Karman potential model. Calculations shows that line at 539 cm[[p]]-1[[/p]](A[[d]]g[[/d]]) corresponds to vibrational mode of six-niembered AlO4 tetrabedwns ring, and line at 573 cm[[p]]-1[[/p]](A[[d]]g[[/d]]) corresponds to the full symmetric vibration of fluorine atoms on ab crystal plane.

Доп.точки доступа:
Zhiguo Xia; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A.S.; Орешонков, Александр Сергеевич; Atuchin, V.V.; International Conference on the Advancement of Materials and Nanotechnology (3 ; 2013 ; Nov. ; 19-22 ; Penang, Malaysia)
}
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    Synthesis, structural and photoluminescence properties of Ca2Al3O6F:Eu2+ phosphor / Zhiguo Xia [и др.] // The 7th Russian-French workshop on Nanosciences and Nanotechnologies : Program and abstract book. - Novosibirsk, 2013. - P. 65 . - ISBN 978-5-901688-29-8
   Перевод заглавия: Синтез, структурные и фотолюминесцентные свойства люминофора Ca2Al3O6F:Eu2+

Материалы конференции

Доп.точки доступа:
Zhiguo Xia; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Atuchin, V. V.; Russian-French workshop on Nanosciences and Nanotechnologies(7 ; 2013 ; Jun. ; 3-6 ; Новосибирск); Российская академия наук; Сибирское отделение РАН; Институт неорганической химии им. А.В. Николаева Сибирского отделения РАН; Институт катализа им. Г.К. Борескова Сибирского отделения РАН; Институт физики полупроводников им. А.В. Ржанова Сибирского отделения РАН
}
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    Zhiguo, Xia.
    Crystal structure and photoluminescence properties of europium doped Ca7La3(PO4)3(SiO4)3F2 / X Zhiguo, M. S. Molokeev, V. V. Atuchin // XVI Международная конференция "Опто-, наноэлектроника, нанотехнологии и микросистемы" : Труды. - Ульяновск, 2013. - P. 156
   Перевод заглавия: Кристаллическая структура и фотолюминесцентные свойства Ca7La3(PO4)3(SiO4)3F2 допированного Eu

Материалы конференции

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Институт нанотехнологий микроэлектроники РАН; Ульяновский государственный университет; Российский фонд фундаментальных исследованийАкадемия наук Татарстана; "Opto-, nanoelectronics, nanotechnology, and microsystems", International Conference (2013 ; Jul. ; 26-30 ; Ulyanovsk, Russia); "Опто-, наноэлектроника, нанотехнологии и микросистемы", международная конференция (2013 ; июль.; 26-30 ; Ульяновск)
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    Linear structural evolution induced tunable photoluminescence in clinopyroxene solid-solution phosphors / Zhiguo Xia [и др.] // Scientific Rep. - 2013. - Vol. 3. - Ст. 3310. - P. 1-7, DOI 10.1038/srep03310. - This research 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 University ofMinistry of Education of China (NCET-12-0950), Fundamental Research Funds for the Central Universities (2011YYL131), and this study was also partially supported by SB RAS, Grant 28.12. Zhiguo Xia was supported by Beijing Nova Program (Z131103000413047) . - ISSN 2045-2322
   Перевод заглавия: Линейная структурная эволюция индуцированной перестраиваемой фотолюминесценции в твердых растворах клинопироксеновых люминофоров
Аннотация: Clinopyroxenes along the Jervisite (NaScSi2O6) – Diopside (CaMgSi2O6) join have been studied, and a solid-solution of the type (N[[d]]1-x[[/d]]Ca[[d]]x[[/d]])(Sc[[d]]1-x[[/d]]Mg[[d]]x[[/d]])Si2O6 has been identified in the full range of 0 ≤ x ≤ 1. The powder X-ray patterns of all the phases indicate a structural similarity to the end compounds and show smooth variation of structural parameters with composition. The linear structural evolution of iso-structural (Na[[d]]1-x[[/d]]Ca[[d]]x[[/d]])(Sc[[d]]1-x[[/d]]Mg[[d]]x[[/d]])Si2O6 solid-solutions obeying Vegard’s rule has also been examined and verified by high resolution transmission electron microscopy (HRTEM). The continuous solid-solutions show the same structural type, therefore the photoluminescence spectra of Eu[[p]]2+[[/p]] doped samples possess the superposition of spectral features from blue-emitting component (CaMgSi2O6:Eu[[p]]2+[[/p]]) and yellow-emitting one (NaScSi2O6:Eu[[p]]2+[[/p]]). This indicates that the spectroscopic properties of (Na[[d]]1-x[[/d]]Ca[[d]]x[[/d]])(Sc[[d]]1-x[[/d]]Mg[[d]]x[[/d]])Si2O6 clinopyroxene solid-solutions are in direct relations with structural parameters, and it is helpful for designing color-tunable photoluminescence with predetermined parameters.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
SB RAS, Lab Crystal Phys, Inst Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia

Доп.точки доступа:
Xia, Zhiguo; Zhang, Yuanyuan; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Luo, Yi
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    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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    Cation substitution dependent bimodal photoluminescence in whitlockite structural Ca3-xSrx(PO4)2:Eu2+ (0 ≤ x ≤ 2) solid solution phosphors / H. P. Ji [et al.] // Inorg. Chem. - 2014. - Vol. 53, Is. 20. - P. 11119-11124, DOI 10.1021/ic501679f. - Cited References: 37. - This work was supported by the National Natural Science Foundations of China (Grant Nos. 51032007, 51002146, 51272242), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130022110006), the 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), and Beijing Youth Excellent Talent Program (YETP0635). V.V.A. acknowledges the Ministry of Education and Science of the Russian Federation for financial support. . - ISSN 0020-1669. - ISSN 1520-510X
   Перевод заглавия: Катион зависимая бимодальная люминесценция в твердом растворе Ca3-xSrx(PO4)2:Eu2+ (0 ˂ x ˂ 2) со структурой витлокита

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
LIGHT-EMITTING-DIODES
   EFFICIENT ENERGY-TRANSFER
   EMISSION-TUNABLE PHOSPHOR
   EXCITED WHITE LEDS
   CRYSTAL-STRUCTURE
   LUMINESCENCE PROPERTIES
   Mn2+ PHOSPHOR
   COLOR TONE
   PHASE
   Eu2+
Аннотация: Cation substitution dependent tunable bimodal photoluminescence behavior was observed in the Ca3-xSrx(PO4)2:Eu2+ (0 ≤ x ≤ 2) solid solution phosphors. The Rietveld refinements verified the phase purity and whitlockite type crystal structure of the solid solutions. The tunable photoluminescence evolution was studied as a function of strontium content, over the composition range 0.1 ≤ x ≤ 2. In addition to the emission band peak at 416 nm in Ca3(PO4)2:Eu2+, the substitution of Ca2+ by Sr2+ induced the emerging broad-band peak at 493-532 nm. A dramatic red shift of the emission peak located in the green-yellow region was observed on an increase of x in the samples with 0.75 ≤ x ≤ 2.00. The two emission bands could be related to the EuOn-Ca9 and EuOn-Ca9-xSrx emitting blocks, respectively. The values for the two kinds of emitting blocks in the solid solutions can be fitted well with the observed intensity evolution of the two emission peaks.

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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 & Dielect Mat, Novosibirsk 630090, Russia
Univ Auckland, Dept Chem & Mat Engn, Auckland 1142, New Zealand

Доп.точки доступа:
Ji, H. P.; Huang, Z. H.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Атучин, Виктор Валерьевич; Huang, S. F.
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    Photoluminescence tuning via cation substitution in oxonitridosilicate phosphors: DFT calculations, different site occupations, and luminescence mechanisms / G. Li [et al.] // Chem. Mater. - 2014. - Vol. 26, Is. 9. - P. 2991-3001, DOI 10.1021/cm500844v. - Cited References: 62. - The authors would like to thank the Ministry of Science and Technology of Taiwan (Contract No. MOST 101-2113-M-002-014-MY3), the National Synchrotron Radiation Research Center, Taiwan, the National Natural Science Foundation of China (Grant No. NSFC 21301162), and the Fundamental Research Funds for the Central Universities (Grant No. CUG 130402) for financially supporting this research. Victor V. Atuchin gratefully acknowledges the Ministry of Education and Science of the Russian Federation for the financial support. . - ISSN 0897-4756. - ISSN 1520-5002
   Перевод заглавия: Управление фотолюминесценцией посредством замещения катионов в оксонитридосиликатных люминофорах: ТФП вычисления, заселения различных позиций и механизмы люминесценции

РУБ Chemistry, Physical + Materials Science, Multidisciplinary
Рубрики:
LIGHT-EMITTING-DIODES
   HIGH-TEMPERATURE SYNTHESIS
   LED CONVERSION PHOSPHORS
   CRYSTAL X-RAY
   WHITE-LIGHT
   ORDERED DISTRIBUTION
   GREEN PHOSPHOR
   LAYERED OXONITRIDOSILICATE
   REAL STRUCTURE
   AB-INITIO
Аннотация: Tuning and optimizing luminescent properties of oxonitridosilicates phosphors are important for white light-emitting diode (WLED) applications. To improve the color rendering index, correlated color temperature and thermal stability of layer-structured MSi2O2N2:Eu (M = Sr, Ba) phosphors, cation substitutions have been used to adjust their luminescent properties. However, the underlying mechanisms are still unclear. In this research, a series of (Sr1-xBax)Si2O2N2:Eu (0 ≤ x ≤ 1) compounds were prepared by solid-state reaction, after which systematic emission variations were investigated. The crystal structures of (Sr1-xBax)Si2O2N2:Eu (0 ≤ x ≤ 1) are nominally divided into three sections, namely, Phase 1 (0 ≤ x ≤ 0.65), Phase 2 (0.65 x 0.80), and Phase 3 (0.80 ≤ x ≤ 1) based on the X-ray diffraction measurements. These experimental results are further confirmed by optimizing the crystal structure data with first-principle calculations. Continuous luminescence adjustments from green to yellow are observed in Phase 1 with gradual replacement of Sr2+ with Ba2+, and the abnormal redshift is clarified through extended X-ray absorption fine structure analysis. Sr(Eu)-O/N bond length shrinkage in local structure causes the redshift emission, and the corresponding luminescence mechanism is proposed. Controllable luminescence in Phase 2 (from blue to white) and Phase 3 (from cyan to yellowish green) are observed. Based on the high-resolution transmission electron microscopy and selected area electron diffraction analysis, the two kinds of luminescence tuning are attributed to phase segregation. This study serves as a guide in developing oxonitride luminescent materials with controllable optical properties based on variations in local coordination environments through cation substitutions.

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Держатели документа:
Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China
SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
SB RAS, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Univ St Andrews, Sch Chem, EaSTCHEM, St Andrews KY16 9ST, Fife, Scotland
Natl Cent Univ, Ctr Neutron Beam Applicat, Zhongli 320, Taiwan
Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan
Chongqing Univ Posts & Telecommun, Coll Math & Phys, Chongqing 400065, Peoples R China
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Li, G.; Lin, C. C.; Chen, W.-T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Chiang, C.-Y.; Zhou, W.; Wang, C.-W.; Li, W.-H.; Sheu, H.-S.; Chan, T.-S.; Ma, C.; Liu, R.-S.
}
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10.

    Synthesis and electronic properties of β-RbNd(MoO4)2 / V. V. Atuchin [et al.] // Asian J. Chem. - 2014. - Vol. 26, No. 5. - P. 1284-1286, DOI 10.14233/ajchem.2014.17209. - Cited References: 26. - This study is partly supported by by the Ministry of Education and Science of the Russian Federation. . - ISSN 0970-7077
   Перевод заглавия: Синтез и электронные свойства бета-RbNd(MoO4)2

РУБ Chemistry, Multidisciplinary
Рубрики:
UP-CONVERSION PHOTOLUMINESCENCE
   VIBRATIONAL PROPERTIES
   CRYSTAL-STRUCTURE
   PARTICLES
   MOLYBDATE
   SPECTROSCOPY
   SYSTEM
   ER3+
Кл.слова (ненормированные):
β-RbNd(MoO4)2 -- Electronic structure -- Ab initio calculations -- X-Ray photoelectron spectroscopy
Аннотация: The electronic structure of β-RbNd(MoO4)2 has been evaluated from experimental and theoretical points of view. For the molybdate, X-ray photoelectron valence-band spectra have been measured. The total and partial densities of states of the constituent atoms of β-RbNd(MoO4)2 have been calculated using the FP-LAPW method. The FP-LAPW data reveal that main contributors in the valence-band region of β-RbNd(MoO4)2 are the Rb 4p-, Nd 4f-, Mo 4d- and O 2p-like states.

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Держатели документа:
SB RAS, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia
Natl Acad Sci Ukraine, Frantsevich Inst Problems Mat Sci, UA-03142 Kiev, Ukraine
SB RAS, Lab Oxide Syst, Baikal Inst Nat Management, Ulan Ude 670047, Russia
SB RAS, Lab Crystal Phys, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Hanseo Univ, Dept Adv Mat Sci & Engn, Seosan 356706, South Korea

Доп.точки доступа:
Atuchin, V. V.; Bekenev, V. L.; Chimitova, O. D.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bazarov, B. G.; Базаров Б. Г.; Bazarova, J. G.; Базарова Ж. Г.; Khuzhum, O. Y.; Lim, C. S.
}
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11.

Synthesis and luminescence properties of Li2O–Y2O3–TeO2:Eu3+ tellurite glass / V. V. Atuchin [et al.] // Mater. Chem. Phys. - 2014. - Vol. 147, Is. 3. - P. 1191-1194, DOI 10.1016/j.matchemphys.2014.07.003. - Cited References: 26. - This study is partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 0254-0584. - ISSN 1879-3312

РУБ Materials Science, Multidisciplinary
Рубрики:
LIGHT-EMITTING-DIODES
   SPECTROSCOPIC PROPERTIES
   OPTICAL-PROPERTIES
   ENERGY-TRANSFER
   CERAMICS
   Eu3+
   PHOTOLUMINESCENCE
   TEMPERATURE
   EMISSION
   PHOSPHOR
Кл.слова (ненормированные):
Glasses -- Heat treatment -- Photoluminescence spectroscopy -- Optical properties
Аннотация: The Eu3+-doped red-orange emitting phosphor of tellurite glass 0.25Li2O–0.20Y2O3–0.5TeO2–0.05Eu2O3 has been synthesized by the melt quenching method. The amorphous nature of the glass has been verified by XRD measurements. The photoluminescence excitation and emission spectra, the luminescence decay curves have been investigated for the composition. The phosphor can be efficiently excited by the near UV light to realize the intense narrow red emission line (611 nm) corresponding to forced electric dipole transition 5D0 → 7F2 of Eu3+ ions. The Li2O–Y2O3–TeO2:Eu3+glass phosphor is a potential red-orange emitting candidate for the application in WLEDs.

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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 & Dielect Mat, Novosibirsk 630090, Russia
SB RAS, Inst Geol & Mineral, Lab High Pressure Minerals & Diamond Deposits, Novosibirsk 630090, Russia
Novosibirsk State Univ, Dept Appl Phys, Novosibirsk 630090, Russia
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Atuchin, V. V.; Yelisseyev, A. P.; Galashov, E. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ministry of Education and Science of the Russian Federation
}
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12.

    Crystal chemistry and luminescence properties of red-emitting CsGd1−xEux(MoO4)2 solid-solution phosphors / P. L. Shi [et al.] // Dalton Trans. - 2014. - Vol. 43, Is. 25. - P. 9669-9676, DOI 10.1039/C4DT00339J. - Cited References: 46. - The present work was supported by the National Natural Science Foundations of China (grant no. 51002146, 51272242), 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 Fundamental Research Funds for the Central Universities (2-9-2014-044), and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). V. V. A. gratefully acknowledges the Ministry of Education and Science of the Russian Federation for the financial support. . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Кристаллохимия и люминесцентные свойства твердых растворов люминофоров CsGd1-xEux(MoO4)2, излучающих красный свет

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
WHITE-LIGHT
   VIBRATIONAL PROPERTIES
   HYDROTHERMAL SYNTHESIS
   SINGLE-CRYSTALS
   DIODES
   EFFICIENCY
   PHOTOLUMINESCENCE
   CSGD(MOO4)2
   MORPHOLOGY
   GROWTH
Аннотация: Scheelite related alkali-metal rare-earth double molybdate compounds with a general formula of ALn(MoO4)2 can find wide application as red phosphors. The crystal chemistry and luminescence properties of red-emitting CsGd1−xEux(MoO4)2 solid-solution phosphors have been evaluated in the present paper. A detailed analysis of the structural properties indicates the formation of isostructural scheelite-type CsGd1−xEux(MoO4)2 solid-solutions over the composition range of 0 ≤ x ≤ 1. The photoluminescence emission (PL) and excitation (PLE) spectra, and the decay curves were measured for this series of compounds. The critical doping concentration of Eu3+ is determined to be x = 0.6 in order to realize the maximum emission intensity. The emission spectra of the as-obtained CsGd(1−x)Eux(MoO4)2 phosphors show narrow high intensity red lines at 592 and 615 nm upon excitation at 394 or 465 nm, revealing great potential for applications in white light-emitting diode devices.

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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
RAS, Kirensky Inst Phys, Lab Crystal Phys, SB, Krasnoyarsk 660036, Russia
RAS, Kirensky Inst Phys, Lab Opt Mat & Struct, SB, 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:
Shi, P. L.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.
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13.

    Microwave sol–gel synthesis of CaGd2(MoO4)4:Er3+/Yb3+ phosphors and their upconversion photoluminescence properties / C. S. Lim [et al.] // J. Am. Ceram. Soc. - 2015. - Vol. 98, Is. 10. - P. 3223-3230, DOI 10.1111/jace.13739. - Cited References:69. - This study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2014-046024). VVA and ASA are partially supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 0002. - ISSN 1551-2916
   Перевод заглавия: Микроволновый золь-гель синтез люминофоров CaGd2(MoO4)4:Er3+/Yb3+ и их люминесцентные свойства с апконверсией

РУБ Materials Science, Ceramics
Рубрики:
RED-EMITTING PHOSPHORS
   VIBRATIONAL PROPERTIES
   LUMINESCENCE PROPERTIES
   WHITE LEDS
   SPECTROSCOPIC PROPERTIES
   HYDROTHERMAL SYNTHESIS
   CRYSTAL-STRUCTURE
   ROOM-TEMPERATURE
   ENERGY-TRANSFER
   SR
Аннотация: CaGd2(MoO4)4:Er3+/Yb3+ phosphors with the doping concentrations of Er3+ and Yb3+ (x = Er3+ + Yb3+, Er3+ = 0.05, 0.1, 0.2, and Yb3+ = 0.2, 0.45) have been successfully synthesized by the microwave sol–gel method, and the crystal structure refinement and upconversion photoluminescence properties have been investigated. The synthesized particles, being formed after heat-treatment at 900°C for 16 h, showed a well-crystallized morphology. Under the excitation at 980 nm, CaGd2(MoO4)4:Er3+/Yb3+ particles exhibited strong 525 and 550-nm emission bands in the green region and a weak 655-nm emission band in the red region. The Raman spectrum of undoped CaGd2(MoO4)4 revealed about 15 narrow lines. The strongest band observed at 903 cm−1 was assigned to the ν1 symmetric stretching vibration of MoO4 tetrahedrons. The spectra of the samples doped with Er and Yb obtained under 514.5 nm excitation were dominated by Er3+ luminescence preventing the recording Raman spectra of these samples. Concentration quenching of the erbium luminescence at 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions in the CaGd2(MoO4)4:Er3+/Yb3+ crystal structure was established to be approximately at the 10 at.% doping level.

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Держатели документа:
Hanseo Univ, Dept Adv Mat Sci & Engn, Seosan 356706, South Korea.
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 & Dielect Mat, Novosibirsk 630090, Russia.
SB RAS, Kirensky Inst Phys, Lab Coherent Opt, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660079, Russia.
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
SB RAS, Kirensky Inst Phys, Lab Mol Spect, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Lim, Chang Sung; Atuchin, V. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич
}
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14.

    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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15.

    Photoluminescence of monoclinic Li3AlF6 crystals under vacuum ultraviolet and soft X-ray excitations / V. A. Pustovarov [et al.] // Opt. Mater. - 2015. - Vol. 49. - P. 201-207, DOI 10.1016/j.optmat.2015.09.011. - Cited References: 49. - This work was partly supported by the Ministry of Education and Science of the Russian Federation (the basic part of the government mandate); Center of Excellence "Radiation and Nuclear Technologies" (Competitiveness Enhancement Program of Ural Federal University, Russia), HASYLAB DESY (Projects Nos. 20110843, 20080119EC), European Social Fund ("Mobilitas" program, MJD219), Estonian Research Council (Institutional Research Funding IUT02-26) and Baltic Science Link project coordinated by the Swedish Research Council, VR . - ISSN 0925-3467
   Перевод заглавия: Люминесценция моноклинных кристаллов Li3AlF6 под вакуумным ультрафиолетом и мягким рентгеновским излучением

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
LiBaAlF6 single-crystals
   F-type centers
   LiBaF3 crystals
   Color-centers
   Recombination luminescence
   Rietveld refinement
   VUV spectroscopy
   Trapped excitons
   Energy-transfer
   Pure
Кл.слова (ненормированные):
Li3AlF6 -- Time-resolved luminescence -- VUV spectroscopy -- Defects
Аннотация: Using Bridgman technique we have grown monoclinic β-LiAF crystals suitable for optical studies, performed XRD-identification and Rietveld refinement of the crystal structure and carried out a photoluminescence study upon vacuum ultraviolet (VUV) and extreme ultraviolet (XUV)-excitations, using the low-temperature (T = 7.2 K) time-resolved VUV-spectroscopy technique. The intrinsic PL emission band at 340–350 nm has been identified as due to radiative recombination of self-trapped excitons. The electronic structure parameters were determined: bandgap E g ≈ 12.5 eV, energy threshold for creation of unrelaxed excitons 11.8 eV < E n < 12.5 eV . The PL emission bands at 320–325 and 450 nm were attributed to luminescence caused by lattice defects. We have discovered an efficient excitation of PL emission bands in the energy range of interband transitions ( E ex > 13.5 eV), as well as in the energy range of core transitions at 130 eV. We have revealed UV–VUV PL emission bands at 170 and 208 nm due to defects. A reasonable assumptions about the origin of the UV–VUV bands were discussed.

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Ural Federal University, 19, Mira Street, Yekaterinburg, Russian Federation
Institute of Physics, University of Tartu, 14c, Ravila Street, Tartu, Estonia
Kirensky Institute of Physics, SB RAS, Akademgorodok 50, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, 47, Serysheva Street, Khabarovsk, Russian Federation
Institute of Geology and Mineralogy, SB RAS, 43, Russkaya Street, Novosibirsk, Russian Federation
Novosibirsk National Research University, 2, Pirogova Street, Novosibirsk, Russian Federation

Доп.точки доступа:
Pustovarov, V. A.; Пустоваров В. А.; Ogorodnikov, I. N.; Огородников И. Н.; Omelkov, S. I.; Омелков С. И.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kozlov, A. V.; Козлов А. В.; Isaenko, L. I.; Исаенко Л. И.
}
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16.

    Insights into Ba4Si6O16 structure and photoluminescence tuning of Ba4Si6O16:Ce3+,Eu2+ phosphors / Chen M. [et al.] // J. Mater. Chem. C. - 2015. - Vol. 3, Is. 48. - P. 12477-12483, DOI 10.1039/c5tc03271g. - Cited References: 39. - This work was supported by the National Natural Science Foundations of China (Grant No. 51572023 and 51272242), 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), the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306), and Fundamental Research Funds for the Central Universities (FRF-TP-14-005A1). . - ISSN 2050-7534
   Перевод заглавия: Исследования структуры Ba4Si6O16 и люминесцентных свойств Ba4Si6O16:Ce3+,Eu2+

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
LIGHT-EMITTING-DIODES
   ENERGY-TRANSFER
   LUMINESCENCE PROPERTIES
   WHITE-LIGHT
   GLASS-CERAMICS
   BA PHOSPHORS
   EMISSION
   GREEN
   EU2+
   FLUORESCENCE
Аннотация: The versatile polymorphism and chemical compositions of barium silicates have been studied for a long time and their crystal structures have been established. Herein, we focused on the understanding of the crystal structure of the Ba4Si6O16 phase and the structural correlation of Ba4Si6O16 and Ba2Si3O8; moreover, the luminescence properties of Ce3+,Eu2+-co-activated Ba4Si6O16 phosphors have been discussed. Ba4Si6O16:Ce3+,Eu2+ phosphors show tunable blue-green emission upon excitation with 365 nm ultraviolet (UV) light. The blue emission originates from Ce3+, whereas the bluish-green emission is ascribed to Eu2+, and variation in the emission peak wavelength from 442 to 497 nm can be achieved by properly tuning the Ce3+/Eu2+ ratio. Energy transfer from Ce3+ to Eu2+ in the Ba4Si6O16 host has been validated by the variation of emission spectra as well as the variation of Ce3+ decay lifetimes with increasing Eu2+ concentration, and the energy transfer mechanism is demonstrated to be a resonant type via a dipole-dipole process. The results suggest that Ba4Si6O16:Ce3+,Eu2+ phosphors are potential candidates as a blue-green component for UV-excited white light-emitting diodes. © 2015 The Royal Society of Chemistry.

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Держатели документа:
Key Laboratory of New Energy Materials and Technologies, School of Materials Science 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

Доп.точки доступа:
Chen M.; Xia Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu Q.
Свободных экз. нет}
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17.

    Structural phase transitions and photoluminescence properties of Eu3+ doped Ca(2-x)BaxLaNbO6 phosphors / J. Zhu [et al.] // Dalton Trans. - 2015. - Vol. 44, Is. 42. - P. 18536-18543, DOI 10.1039/c5dt03430b. - Cited References: 27. - The present work was supported by the National Natural Science Foundation of China (Grant No. 51272027, 51472028 and 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) . - ISSN 1477-9226
   Перевод заглавия: Структурные фазовые переходы и фотолюминесцентные свойства люминофоров Ca(2-x)BaxLaNbO6 допированных Eu3+

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
Double-perovskite
   Luminescence properties
   Thermal-stability
   Crystal-chemistry
   Red phosphors
   White LEDs
   Symmetry
   Band
   Ta
   Ln
Аннотация: Crystal structures of the series of double perovskites Ca(2-x)BaxLaNbO6:Eu3+ phosphors have been examined by powder X-ray diffraction and Rietveld refinements. Ca2LaNbO6 has a monoclinic (P21/n) and Ba2LaNbO6 has a monoclinic (C2/m) structure. The structural phases of Ca(2-x)BaxLaNbO6:Eu3+ samples are divided into three sections depending on different Ca/Ba ratios: (1) monoclinic phase (P21/n) as Ca2LaNbO6 in the range of x = 0-0.1, (2) mixed phases containing Ca2LaNbO6 and Ba2LaNbO6 between 0.15 and 1.2, and (3) monoclinic phase (C2/m) as Ba2LaNbO6 for x = 1.4-2. Eu3+ ions act as the structural probes to study the structural phase transitions, and the evolution of the photoluminescence properties and thermal stability behaviours has been also comparatively investigated depending on different structural symmetries from Ca2LaNbO6 to Ba2LaNbO6 phase. The strong red emission from 5D0-7F2 peaking at 618 nm can be found in Ca2LaNbO6:Eu3+ phosphors, which is attributed to the low crystal field effect of the activator ions located in the highly distorted [Lao8] polyhedra sites. The composition-optimized phosphors can find applications in white light emitting diodes (LEDs).

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Держатели документа:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China
School of Materials Sciences and Technology, China University of Geosciences, 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:
Zhu, J.; Xia, Zhiguo; Zhang, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.
}
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18.

    Chemical unit cosubstitution and tuning of photoluminescence in the Ca2(Al1-xMgx)(Al1-xSi1+x)O7:Eu2+ phosphor / Z. Xia [et al.] // J. Am. Chem. Soc. - 2015. - Vol. 137, Is. 39. - P. 12494-12497, DOI 10.1021/jacs.5b08315. - Cited References: 24. - This work was supported by the National Natural Science Foundations of China (Grant Nos. 51572023 and 51272242), 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), and the Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS (RERU2015022). C.M. acknowledges financial support from National Natural Science Foundation of China (Grant No. 11204393), Natural Science Foundation Project of Chongqing (Grant No. CSTC2014JCYJA50034), and National Training Programs of Innovation and Entrepreneurship for Undergraduates (Grant No. 201410617001). K.R. recognizes that this material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1324585. . - ISSN 0002-7863
   Перевод заглавия: Со-замещение химической группы и регулирование фотолюминесценции в люминофоре Ca2(Al1-xMgx)(Al1-xSi1+x)O7:Eu2+

РУБ Chemistry, Multidisciplinary
Рубрики:
LUMINESCENCE PROPERTIES
TRANSITIONS
IONS
Аннотация: The union of structural and spectroscopic modeling can accelerate the discovery and improvement of phosphor materials if guided by an appropriate principle. Herein, we describe the concept of chemical unit cosubstitution as one such potential design scheme. We corroborate this strategy experimentally and computationally by applying it to the Ca2(Al1-xMgx)(Al1-xSi1+x)O7:Eu2+ solid solution phosphor. The cosubstitution is shown to be restricted to tetrahedral sites, which enables the tuning of luminescent properties. The emission peaks shift from 513 to 538 nm with a decreasing Stokes shift, which has been simulated by a crystal-field model. The correlation between the 5d crystal-field splitting of Eu2+ ions and the local geometry structure of the substituted sites is also revealed. Moreover, an energy decrease of the electron-phonon coupling effect is explained on the basis of the configurational coordinate model. © 2015 American Chemical Society.

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Держатели документа:
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Department of Chemistry, Northwestern University, Evanston, IL, United States

Доп.точки доступа:
Xia, Zhiguo; Ma, C.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.; Rickert, K.; Poeppelmeier, K. R.
}
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19.

Microwave sol–gel synthesis and upconversion photoluminescence properties of CaGd2(WO4)4:Er3+/Yb3+ phosphors with incommensurately modulated structure / C. S. Lim [et al.] // J. Solid State Chem. - 2015. - Vol. 228. - P. 160-166, DOI 10.1016/j.jssc.2015.04.032. - Cited References:70. - This study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2014-046024). VVA, ASA and ASO are partially supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 0022. - ISSN 1095-726X. -

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
CORE-LEVEL SPECTROSCOPY
LUMINESCENCE PROPERTIES
WHITE-LIGHT
Кл.слова (ненормированные):
Double tungstate -- Microwave sol-gel -- Upconversion -- XRD refinement -- Raman
Аннотация: CaGd2−x(WO4)4:Er3+/Yb3+ phosphors with the doping concentrations of Er3+ and Yb3+ (x=Er3++Yb3+, Er3+=0.05, 0.1, 0.2 and Yb3+=0.2, 0.45) have been successfully synthesized by the microwave sol–gel method. The crystal structure of CaGd2−x(WO4)4:Er3+/Yb3+ tungstates have been refined, and upconversion photoluminescence properties have been investigated. The synthesized particles, being formed after the heat-treatment at 900 °C for 16 h, showed a well crystallized morphology. Under the excitation at 980 nm, CaGd2(WO4)4:Er3+/Yb3+ particles exhibited a strong 525-nm and a weak 550-nm emission bands in the green region and a very weak 655-nm emission band in the red region. The Raman spectrum of undoped CaGd2(WO4)4 revealed about 12 narrow lines. The strongest band observed at 903 cm−1 was assigned to the ν1 symmetric stretching vibration of WO4 tetrahedrons. The spectra of the samples doped with Er and Yb obtained under the 514.5 nm excitation were dominated by Er3+ luminescence preventing the recording of these samples Raman spectra. Concentration quenching of the erbium luminescence at 2H11/2→4I15/2 transition is weak in the range of erbium doping level xEr=0.05–0.2, while, for transition 4S3/2→4I15/2, the signs of concentration quenching become pronounced at xEr=0.2.

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Держатели документа:
Hanseo Univ, Dept Adv Mat Sci & Engn, Seosan 356706, South Korea.
SB RAS, LV Kirensky Phys Inst, Lab Coherent Opt, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660079, Russia.
SB RAS, LV Kirensky Phys Inst, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
SB RAS, LV Kirensky Phys Inst, Lab Mol Spect, 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 & Dielect Mat, Novosibirsk 630090, Russia.

Доп.точки доступа:
Lim, Chang Sung; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Atuchin, V. V.; Атучин, Виктор Валерьевич
}
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20.

    Crystal structure and photoluminescence evolution of La5(Si2+xB1–x)(O13–xNx):Ce3+ solid solution phosphors / Z. G. Xia [et al.] // J. Phys. Chem. C. - 2015. - Vol. 119, Is. 17. - P. 9488-9495, DOI 10.1021/acs.jpcc.5b01211. - Cited References:25. - The present work was supported by the National Natural Science Foundations of China (Grants 51002146 and 51272242), Natural Science Foundations of Beijing (Grant 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 New Ceramics and Fine Processing, Tsinghua University (KF201306) and Fundamental Research Funds for the Central Universities (FRF-TP-14-005A1). . - ISSN 1932-7447
   Перевод заглавия: Кристаллическая структура и постепенное изменение фотолюминесценции в твердых растворах La5(Si2+xB1-x)(O13-xNx):Ce3+

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
ENERGY-TRANSFER PROPERTIES
LUMINESCENCE PROPERTIES
TUNABLE
Аннотация: A series of iso-structural La-5(Si2+xB1-x)(O13-xNx):Ce3+ phosphors with apatite structure have been prepared. A combination of powder X-ray diffraction and neutron scattering technique was employed to explore the crystal structural evolution and the rigid nature from oxy- to oxynitride-based apatites, and some local structures were also characterized by HRTEM and Si-29 NMR data, respectively. The new La-5(Si2+xB1-x)(O13-xNx):Ce3+ solid solution phosphors gave continuously controlled emission from 421 nm [La5Si2BO13:Ce3+, end-member (x = 0)] to 463 nm (La(5)Si3O12N:Ce3+, end-member (x = 1)). Substitution of B3+ and O-2 by Si4+ and N-3 in La-5(Si2+xB1-x)(O13-xNx):Ce3+ phosphors produced more covalency into the crystal field environment around the Ce3+ ions inducing the red-shifted emission, further improving the thermal stability of the oxynitride-based apatite phosphors. The proposed approach from oxy- to oxynitride based iso-structural phases could significantly contribute to future research in designing complex solid solution phosphors.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
RAS, SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
Far Eastern State Transport Univ, Khabarovsk 680021, Russia
Chonnam Natl Univ, Sch Mat Sci & Engn, Kwangju 500757, South Korea

Доп.точки доступа:
Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Im, Won Bin; Unithrattil, Sanjith; Liu, Quanlin
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