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    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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    Su, Binbin.
    Mn2+-Based narrow-band green-emitting Cs3MnBr5 phosphor and the performance optimization by Zn2+ alloying / B. B. Su, M. S. Molokeev, Z. G. Xia // J. Mater. Chem. C. - 2019. - Vol. 7, Is. 36. - P. 11220-11226, DOI 10.1039/c9tc04127c. - Cited References: 24. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51722202, 51972118 and 51572023), Natural Science Foundations of Beijing (2172036) and the Guangdong Provincial Science & Technology Project (no. 2018A050506004). . - ISSN 2050-7526. - ISSN 2050-7534
   Перевод заглавия: Узкополосный зеленый люминофор Cs3MnBr5 на основе Mn2+ и оптимизация рабочих характеристик путем легирования Zn2+

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
THERMAL-STABILITY
BACKLIGHT
EMISSION
Аннотация: To discover new narrow-band green-emitting phosphors is a challenge for backlighting light-emitting diodes (LEDs) used in liquid crystal displays (LCDs). The synthesis and optical properties of Cs3MnBr5 are demonstrated herein. The intrinsic Mn2+ luminescence without concentration quenching leads to intense green emission at 520 nm with narrow full width at half maximum of 42 nm and high photoluminescence quantum yield (PLQY) of 49% under the excitation at 460 nm. When a small amount of Zn2+ is introduced into Cs3MnBr5, the luminescence intensity decreases slightly. However, the thermal stability of Cs3MnBr5 is improved from 82% to 87% with the intensity values at 423 K compared to that at 298 K. The white LED device fabricated using Cs3Mn0.96Zn0.04Br5 (green) and K2SiF6:Mn4+ (red) phosphors with a blue LED chip exhibit a high luminous efficiency (107.76 lm W-1) and wide color gamut (101% National Television System Committee standard (NTSC) in Commission Internationale de L'Eclairage (CIE) 1931 color space), demonstrating its potential application in wide color gamut LCD backlights.

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Держатели документа:
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.
Fed Res Ctr KSC SB RAS, 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:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo
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Crystal Structure of Norfloxacinium and 2,2 '-Bipyridyl-1 '-Ium 2-Thiobarbiturates / N. N. Golovnev, M. S. Molokeev, I. V. Sterkhova, M. K. Lesnikov // J. Struct. Chem. - 2020. - Vol. 61, Is. 10. - P. 1639-1647, DOI 10.1134/S0022476620100170. - Cited References: 33. - The reported study was funded by RFBR, project number 19-52-80003 . - ISSN 0022-4766. - ISSN 1573-8779

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
THERMAL-STABILITY
ACID
FORMS
Кл.слова (ненормированные):
2,2 '-dipyridynium and norfloxacinium 2-thiobarbiturates -- synthesis -- structure -- thermal stability
Аннотация: Organic salts with the composition NfH2(Htba)·6H2O (I) and BipyH(Htba)·2H2O (II) (Н2tba is 2-thiobarbituric acid, NfH is norfloxacin and Bipy is 2,2′-dipyridyl) are prepared. Their structures are determined by XRD (CCDC cif-file No. 1967494-1967495). Crystals I are triclinic: a = 11.8821(4) Å, b = 11.9959(5) Å, c = 12.0038(4) Å, α = 119.835(1)°, β = 107.691(1)°, γ = 95.237(1)°, V = 1351.80(9) Å3, space group P-1, Z = 2. Crystals II are monoclinic: a = 7.9587(2) Å, b = 19.6272(4) Å, c = 10.1118(2) Å, β = 98.118(1)°, V = 1563.71(6) Å3, space group P21/n, Z = 4. The structures are stabilized by numerous hydrogen bonds and π–π interactions involving Нtba−, NfH+2, and BipyH+ ions. Thermal decomposition of these compounds in air includes dehydration and oxidative degradation stages.

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Публикация на русском языке Кристаллическая структура 2-тиобарбитуратов норфлоксациниума и 2,2'-дипиридил-1'-иума [Текст] / Н. Н. Головнев, М. С. Молокеев, И. В. Стерхова, М. К. Лесников // Журн. структ. химии. - 2020. - Т. 61 № 10. - С. 1724-1733

Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Fed Res Ctr KSC, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk, Russia.
Far Eastern State Transport Univ, Khabarovsk, Russia.
Russian Acad Sci, Favorsky Inst Chem, Siberian Branch, Irkutsk, Russia.

Доп.точки доступа:
Golovnev, N. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sterkhova, I., V; Lesnikov, M. K.; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]
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    Rapid synthesis of red-emitting Sr2Sc0.5Ga1.5O5:Eu2+ phosphors and the tunable photoluminescence via Sr/Ba substitution / Z. Y. Yang, Y. Y. Zhou, J. W. Qiao [et al.] // Adv. Opt. Mater. - 2021. - Vol. 9. Is. 16. - Ст. 2100131, DOI 10.1002/adom.202100131. - Cited References: 44. - Z.Y. and Y.Z. contributed equally to this work. This research was supported by the National Natural Science Foundations of China (Grant Nos. 51972118 and 51961145101), International Cooperation Project of National Key Research and Development Program of China (No. 2021YFE0105700), Guangzhou Science & Technology Project (No. 202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (No. 2017BT01x137). This work was also funded by RFBR according to the research Project No. 19-52-80003 . - ISSN 2195-1071
   Перевод заглавия: Синтез люминофоров Sr2Sc0.5Ga1.5O5: Eu2+ с красным излучением и перестраиваемая фотолюминесценция за счет замещения Sr/Ba

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
LUMINESCENCE PROPERTIES
   THERMAL-STABILITY
   EU2+
   GREEN
   EU3+
   SR
Кл.слова (ненормированные):
Eu2+-doped phosphors -- light-emitting diodes -- photoluminescence -- red emission
Аннотация: Discovering new Eu2+-doped red-emitting phosphors in oxide-based materials is a challenge for white light-emitting diode (WLED) applications. Herein, a highly efficient high-frequency induction heating method is employed to rapidly prepare the red-emitting Sr2Sc0.5Ga1.5O5:Eu2+ phosphors peaking at 614 nm and exhibiting a high photoluminescence quantum yield of 78.4% under the excitation of 440 nm. The structural and spectral analyses suggest that Eu2+ ions tend to enter the [Sc1/Ga1O6] and [Ga2O6] polyhedrons with small coordination numbers, leading to the broadband red emission originated from large crystal field splitting of Eu2+ 5d level. The chemical substitution of Ba in the Sr site enhances the thermal stability and helps to the photoluminescence tuning from 614 to 728 nm in SrBaSc0.5Ga1.5O5:Eu2+. The WLED device fabricated by blending the red Sr1.7Ba0.3Sc0.5Ga1.5O5:Eu2+ and yellow Y3(Al, Ga)5O12:Ce3+ phosphors shows a high color-rendering index (Ra = 91.1), and low color-correlated temperature (CCT = 4750 K). This study aims to provide a new synthesis method and design principle for guiding the development of Eu2+-doped oxide-based red phosphors with low preparation cost; moreover, the photoluminescence tuning strategy via cation substitutions is essential to achieve tunable emission, even the near-infrared luminescence.

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Держатели документа:
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Sch Mat Sci & Engn,Guangdong Engn Technol Res & D, Guangzhou 510641, Guangdong, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Kemerovo State Univ, Dept Res & Dev, Kemerovo 650000, Russia.
South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Yang, Zhiyu; Zhou, Yayun; Qiao, Jianwei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo
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    Theoretical study of elastic properties of SiC nanowires of different shapes / P. B. Sorokin [et al.] // J. Nanosci. Nanotechnol. - 2010. - Vol. 10, Is. 8. - P. 4992-4997, DOI 10.1166/jnn.2010.2424. - Cited Reference Count: 49. - Гранты: This work was partially supported by JSPS-RFBR collaborative grant 09-02-92107. The electronic structure calculations have been performed on the Joint Supercomputer Centre of the Russian Academy of Sciences. One of the authors (Pavel V. Avramov) acknowledges the encouragement of Professor K. Morokuma, research leader of Fukui Institute, Kyoto University and Dr. Alister Page for kind help and support. The geometry of all structures was visualized by ChemCraft software.SUP53/SUP. - Финансирующая организация: JSPS-RFBR [09-02-92107]; Fukui Institute, Kyoto University . - ISSN 1533-4880. - ISSN 1533-4899
Рубрики:
INITIO MOLECULAR-DYNAMICS
   SILICON-CARBIDE
   THERMAL-STABILITY
   CARBON NANOTUBES
   NANORODS
   GROWTH
   SURFACES
   NANOCRYSTALS
   POTENTIALS
   CONSTANTS
Кл.слова (ненормированные):
Silicon Carbide -- Nanowires -- Elastic Properties -- DFT -- Molecular Mechanics -- DFT -- Elastic properties -- Molecular mechanics -- Nanowires -- Silicon carbide -- Atomic structure -- Cubic phasis -- DFT -- Effective size -- Elastic properties -- SiC nanowire -- Silicon carbide nanowires -- Theoretical study -- Wire geometries -- Young's Modulus -- Crystal atomic structure -- Density functional theory -- Elastic moduli -- Elasticity -- Molecular mechanics -- Nanowires -- Wire -- Silicon carbide
Аннотация: The atomic structure and elastic properties of silicon carbide nanowires of different shapes and effective sizes were studied using density functional theory and classical molecular mechanics. Upon surface relaxation, surface reconstruction led to the splitting of the wire geometry, forming both hexagonal (surface) and cubic phases (bulk). The behavior of the pristine SiC wires under compression and stretching was studied and Young's moduli were obtained. For Y-shaped SiC nanowires the effective Young's moduli and behavior in inelastic regime were elucidated.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Sorokin, P.B.; Kvashnin, D.G.; Kvashnin, A.G.; Avramov, P. V.; Аврамов, Павел Вениаминович; Chernozatonskii, L.A.
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