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    Crystal structure evolution and luminescence properties of color tunable solid solution phosphors Ca2+xLa8-x(SiO4)6-x(PO4)xO2:Eu2+ / Y. Xia [et al.] // Dalton Trans. - 2016. - Vol. 45, Is. 3. - P. 1007-1015, DOI 10.1039/c5dt03786g. - Cited References: 42. - This work was sponsored by National Natural Science Foundation of China (Grant No. 51472223), the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-12-0951) and the Fundamental Research Funds for the Central Universities (Grant No. 2652015020). . - ISSN 1477-9226
   Перевод заглавия: Изменение кристаллической структуры и люминесцентных свойств люминофоров Ca2+xLa8-x(SiO4)6-x(PO4)xO2:Eu2+ с управляемым цветом

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
LIGHT-EMITTING-DIODES
   WHITE-LIGHT
   ENERGY-TRANSFER
   SILICATE GLASS
   SINGLE-PHASE
   EU2+
   LEDS
   PHOTOLUMINESCENCE
   EMISSION
   UV
Аннотация: A series of apatite solid solution phosphors Ca2+xLa8-x(SiO4)6-x(PO4)xO2:Eu2+ (x = 0,2,4,6) were synthesized by a conventional higherature solid-state reaction. The phase purity was examined using XRD, XPS and XRF. The crystal structure information, such as the concentration, cell parameters and occupation rate, was analyzed using a Rietveld refinement, demonstrating that the Eu2+ activated the Ca2La8(SiO4)6O2 and Ca8La2(PO4)6O2 to form continuous solid solution phosphors. Different behaviors of luminescence evolution in response to structural variation were verified among the series of phosphors. Two kinds of Eu2+ ion sites were proved using low temperature PL spectra (8k) and room temperature decay curves. The substitution of large La3+ ions by small Ca2+ ions induced a decreased crystal field splitting of the Eu2+ ions, which caused an increase in emission energy from the 5d excited state to the 4f ground state and a resultant blue-shift from 508 nm to 460 nm. Therefore, with the crystal structure evolution, the emitted color of the series of phosphors could be tuned from green to blue by adjusting the ratio of Ca/La. © 2016 The Royal Society of Chemistry.

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Держатели документа:
School of Materials Science and Technology, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences, Beijing, 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:
Xia, Y.; Chen, J.; Liu, Y.-G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Guan, M.; Huang, Z.; Fang, M.
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    Influence of cation substitution on the crystal structure and luminescent properties in apatite structural Ba4.97- xSrx(PO4)3Cl:0.03Eu2+ phosphors / L. Zhu [et al.] // Chem. Phys. Lett. - 2016. - Vol. 658. - P. 248-253, DOI 10.1016/j.cplett.2016.06.061. - Cited References: 23. - This present work was supported by the National Natural Science Foundations of China (Grant Nos. 51472222 and 51372232), the Fundamental Research Funds for the Central Universities (Grant No. 2652015310), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130022110006). . - ISSN 0009-2614
   Перевод заглавия: Влияние катионного замещения на кристаллическую структуру и люминесценные свойства в апатите Ba4.97-xSrx(PO4)3Cl:0.03Eu2+

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
PHOTOLUMINESCENCE
   ENERGY
   Ce3+
   Sr
   UV
Кл.слова (ненормированные):
Substitution -- Apatite -- Ba4.97- xSrx(PO4)3Cl:0.03Eu2+ -- Luminescence
Аннотация: A series of apatite-type phosphors Ba4.97- xSrx(PO4)3Cl:Eu2+(x = 0, 0.5, 1.0, 1.5, 2.0) were synthesized by the high temperature solid-state reaction method, and its luminescence properties were investigated in detail. It can be found that a red shift of the emission peak wavelength emerged from 439 to 462 nm with the continuous introduction of Sr2+ into the crystal lattice which has been simulated by a crystal-field model. The red shift is explained by the distortion in the crystal structure through X-ray diffraction and the Rietveld refinement analysis. According to a recently raised structural model, Eu2+ ions are surrounded by O atoms, PO4 tetrahedrons and Ba/Sr ions. After introducing Sr2+ into the lattice, the interatomic distance between Ba/Sr atoms and Eu2+ was expected to become shorter, resulting in a distortion of the inner EuOn polyhedrons. Then the crystal field strength surrounding Eu2+ was increased, finally resulting in the red shift. © 2016 Published by Elsevier B.V.

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Держатели документа:
School of Materials Science and Technology, National Laboratory of Mineral Materials, 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, L.; Huang, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Min, X.; Liu, Y.; Fang, M.; Wu, X.
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