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    Tuning of photoluminescence and local structures of substituted cations in xSr2Ca(PO4)2-(1 - x)Ca10Li(PO4)7:Eu2+ phosphors / M. Chen [et al.] // Chem. Mater. - 2017. - Vol. 29, Is. 3. - P. 1430-1438, DOI 10.1021/acs.chemmater.7b00006. - Cited References: 37. - The present work was supported by the National Natural Science Foundation of China (Grants 91622125 and 51572023), Natural Science Foundations of Beijing (2172036), and Fundamental Research Funds for the Central Universities (FRF-TP-15-003A2). . - ISSN 0897-4756
   Перевод заглавия: Управляемая люминесценция и локальная структура замещаемых катионов в люминофоре xSr2Ca(PO4)2-(1-x)Ca10Li(PO4)7:Eu2+
Кл.слова (ненормированные):
Calcium -- Energy transfer -- Europium -- Light emission -- Lithium -- Luminescence -- Phosphors -- Photoionization -- Photoluminescence -- Single crystals -- Composition ranges -- Crystal-field splitting -- Luminescence measurements -- Non-linear variation -- Photoionization process -- Polyhedra distortion -- Rare earth doped solids -- Temperature dependent -- Solid solutions
Аннотация: Local structure modification in solid solution is an essential part of photoluminescence tuning of rare earth doped solid state phosphors. Herein we report a new solid solution phosphor of Eu2+-doped xSr2Ca(PO4)2-(1 - x)Ca10Li(PO4)7 (0 ≤ x ≤ 1), which share the same β-Ca3(PO4)2 type structure in the full composition range. Depending on the x parameter variation in xSr2Ca(PO4)2-(1 - x)Ca10Li(PO4)7:Eu2+, the vacancies generated in the M(4) site enable the nonlinear variation of cell parameters and volume, and this increases the magnitude of M(4)O6 polyhedra distortion. The local structure modulation around the Eu2+ ions causes different luminescent behaviors of the two-peak emission and induces the photoluminescence tuning. The shift of the emission peaks in the solid solution phosphors with different compositions has been discussed. It remains invariable at x ≤ 0.5, but the red-shift is observed at x > 0.5 which is attributed to combined effect of the crystal field splitting, Stokes shift, and energy transfer between Eu2+ ions. The temperature-dependent luminescence measurements are also performed, and it is shown that the photoionization process is responsible for the quenching effect.

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Держатели документа:
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
State Key Laboratory of Tribology, Tsinghua University, Beijing, China

Доп.точки доступа:
Chen, M.; Xia, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Wang, T.; Liu, Q.
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Recoil-induced dissociation in hard-X-ray photoionization / J. -C. Liu // Phys. Rev. A. - 2019. - Vol. 100, Is. 5. - Ст. 053408, DOI 10.1103/PhysRevA.100.053408. - Cited References: 42. - We thank Marc Simon and Renaud Guillemin for fruitful discussions of the experimental observation of the effect studied here. This work is supported by the Swedish Research Council (VR). J.-C.L. thanks the support by the National Science Foundation of China under Grants No. 11574082 and No. 11974108 and the Fundamental Research Funds for the Central Universities (No. 2018MS050). F.G. and S.P. acknowledge support within the State contract of the Ministry of Education and Science of the Russian Federation for Siberian Federal University for Scientific Research in 2017-2019 (Project No. 3.2662.2017); V.V.C. and A.F. acknowledge funding from the ERC-ADG-2014 - Advanced Investigator Grant No. 669531 EDAX under the Horizon 2020 EU Framework, Programme for Research and Innovation. . - ISSN 2469-9926. - ISSN 2469-9934
Аннотация: We predict the recoil-induced molecular dissociation in hard-x-ray photoionization. The recoil effect is caused by electronic and photon momentum exchange with the molecule. We show the strong role of relativistic effects for the studied molecular fragmentation. The recoil-induced fragmentation of the molecule is caused by elongation of the bond due to the vibrational recoil effect and because of the centrifugal force caused by the rotational recoil. The calculations of the x-ray photoelectron spectra of the H2 and NO molecules show that the predicted effects can be observed in high-energy synchrotrons like SOLEIL, SPring-8, PETRA, and XFEL SACLA. The relativistic effect enhances the recoil momentum transfer and makes it strongly sensitive to the direction of ejection of the fast photoelectron with respect to the photon momentum.

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Department of Mathematics and Physics, North China Electric Power University, 102206 Beijing, China
Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
University of Potsdam, Institute of Physics and Astronomy, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
Siberian Federal University, 660041 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute for Methods and Instrumentation in Synchrotron Radiation Research FG-ISRR, Helmholtz-Zentrum Berlin f¨ur Materialien und Energie Albert-Einstein-Strasse 15, 12489 Berlin, Germany
Theoretical Chemistry & Biology, Royal Institute of Technology, S-106 91 Stockholm, Sweden

Доп.точки доступа:
Liu, Ji-Cai; Vaz da Cruz, Vinícius; Polyutov, S. P.; Полютов, Сергей Петрович; Föhlisch, Alexander; Gel'mukhanov, F.; Гельмуханов, Фарис Хафизович
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