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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhu J., Xia, Zhiguo, Zhang Y., Molokeev M. S., Liu Q.
Заглавие : Structural phase transitions and photoluminescence properties of Eu3+ doped Ca(2-x)BaxLaNbO6 phosphors
Место публикации : Dalton Trans.: Royal Society of Chemistry, 2015. - Vol. 44, Is. 42. - P.18536-18543. - ISSN 1477-9226, DOI 10.1039/c5dt03430b
Примечания : 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)
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su, Binbin, Molokeev M. S., Xia, Zhiguo
Заглавие : Mn2+-Based narrow-band green-emitting Cs3MnBr5 phosphor and the performance optimization by Zn2+ alloying
Место публикации : J. Mater. Chem. C. - 2019. - Vol. 7, Is. 36. - P.11220-11226. - ISSN 2050-7526, DOI 10.1039/c9tc04127c. - ISSN 2050-7534(eISSN)
Примечания : 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).
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova, I., V, Lesnikov M. K.
Заглавие : Crystal Structure of Norfloxacinium and 2,2 '-Bipyridyl-1 '-Ium 2-Thiobarbiturates
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]
Место публикации : J. Struct. Chem. - 2020. - Vol. 61, Is. 10. - P.1639-1647. - ISSN 0022-4766, DOI 10.1134/S0022476620100170. - ISSN 1573-8779(eISSN)
Примечания : Cited References: 33. - The reported study was funded by RFBR, project number 19-52-80003
Предметные рубрики: THERMAL-STABILITY
ACID
FORMS
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang, Zhiyu, Zhou, Yayun, Qiao, Jianwei, Molokeev M. S., Xia, Zhiguo
Заглавие : Rapid synthesis of red-emitting Sr2Sc0.5Ga1.5O5:Eu2+ phosphors and the tunable photoluminescence via Sr/Ba substitution
Место публикации : Adv. Opt. Mater. - 2021. - Vol. 9. Is. 16. - Ст.2100131. - ISSN 2195-1071, DOI 10.1002/adom.202100131
Примечания : 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
Предметные рубрики: LUMINESCENCE PROPERTIES
THERMAL-STABILITY
EU2+
GREEN
EU3+
SR
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sorokin P.B., Kvashnin D.G., Kvashnin A.G., Avramov P. V., Chernozatonskii L.A.
Заглавие : Theoretical study of elastic properties of SiC nanowires of different shapes
Место публикации : J. Nanosci. Nanotechnol. - 2010. - Vol. 10, Is. 8. - P.4992-4997. - ISSN 1533-4880, DOI 10.1166/jnn.2010.2424. - ISSN 1533-4899
Примечания : 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/SUPФинансирующая организация: JSPS-RFBR [09-02-92107]; Fukui Institute, Kyoto University
Предметные рубрики: INITIO MOLECULAR-DYNAMICS
SILICON-CARBIDE
THERMAL-STABILITY
CARBON NANOTUBES
NANORODS
GROWTH
SURFACES
NANOCRYSTALS
POTENTIALS
CONSTANTS
Ключевые слова (''Своб.индексиров.''): 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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