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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Atuchin V. V., Molokeev M. S., Ji Myung Jang, Yong Woo Yoon, Dong Min Won, Lei Zhu, Chang Sung Lim
Заглавие : Microwave-Modified Sol-Gel Preparation of CaLa2(MoO4)4:Er3+/Yb3+ Upconversion Phosphors and The Crystal Structure Refinement
Коллективы : Conference on Multi-functional Materials and Applications, (8; 2014 ; Nov. ; 27-29; Chungnam, Korea)
Место публикации : The 8th Conference on Multi-functional Materials and Applications (ICMMA 2014). - 2014 . - Ст.Poster 04-P. - С. 84-86
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Atuchin V. V., Molokeev M. S., Ji Myung Jang, Yong Woo Yoon, Dong Min Won, Lei Zhu, Chang Sung Lim
Заглавие : Crystal structure refinement and upconversion properties of CaGd2(MoO4)4:Er3+/Yb3+ particles synthesized by the microwave-modified sol-gel method
Коллективы : Conference on Multi-functional Materials and Applications, (8; 2014 ; Nov. ; 27-29; Chungnam, Korea)
Место публикации : The 8th Conference on Multi-functional Materials and Applications (ICMMA 2014). - 2014 . - Ст.Poster 05-P. - С. 87-89
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V. V.
Заглавие : Microwave sol–gel synthesis and upconversion photoluminescence properties of CaGd2(WO4)4:Er3+/Yb3+ phosphors with incommensurately modulated structure
Место публикации : J. Solid State Chem. - 2015. - Vol. 228. - P.160-166. - ISSN 0022, DOI 10.1016/j.jssc.2015.04.032. - ISSN 1095726X(eISSN)
Примечания : 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.
Предметные рубрики: CORE-LEVEL SPECTROSCOPY
LUMINESCENCE PROPERTIES
WHITE-LIGHT
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V. V.
Заглавие : The modulated structure and frequency upconversion properties of CaLa2(MoO4)4:Ho3+/Yb3+ phosphors prepared by microwave synthesis
Место публикации : Phys. Chem. Chem. Phys.: Royal Society of Chemistry, 2015. - Vol. 17, Is. 29. - P.19278-19287. - ISSN 1463-9076, DOI 10.1039/c5cp03054d
Примечания : Cited References: 63. - 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.
Аннотация: CaLa2−x(MoO4)4:Ho3+/Yb3+ phosphors with the doping concentrations of Ho3+ and Yb3+ (x = Ho3+ + Yb3+, Ho3+ = 0.05; Yb3+ = 0.35, 0.40, 0.45 and 0.50) have been successfully synthesized by the microwave sol–gel method. The modulated and averaged crystal structures of CaLa2−x(MoO4)4:Ho3+/Yb3+ molybdates have been found by the Rietveld method, and the upconversion photoluminescence properties have been investigated. The synthesized particles, being formed after the heat-treatment at 900 °C for 16 h, showed a highly crystallized state. Under the excitation at 980 nm, CaLa2−x(MoO4)4:Ho3+/Yb3+ particles exhibited strong 545 and 655 nm emission bands in the green and red regions. When the Yb3+:Ho3+ ratios are 9:1 and 10:1, the UC intensity of CaLa1.5(MoO4)4:Yb0.45/Ho0.05 and CaLa1.45(MoO4)4:Yb0.50/Ho0.05 particles is the highest for different bands. The CIE coordinates calculated for CaLa2−x(MoO4)4:Ho3+/Yb3+ phosphors are related to the yellow color field. The Raman spectrum of undoped CaLa2(MoO4)4 has revealed about 13 narrow lines. The strongest band observed at 906 cm−1 was assigned to the ν1 symmetric stretching vibration of MoO4 tetrahedra. The spectra of the samples doped with Ho and Yb, as obtained under the 514.5 nm excitation, were dominated by Ho3+ luminescence over the wavenumber range of 700 cm−1 preventing the recording of the Raman spectra.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Atuchin V. V., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S.
Заглавие : Microwave sol–gel synthesis of CaGd2(MoO4)4:Er3+/Yb3+ phosphors and their upconversion photoluminescence properties
Место публикации : J. Am. Ceram. Soc.: Wiley-Blackwell, 2015. - Vol. 98, Is. 10. - P.3223-3230. - ISSN 0002, DOI 10.1111/jace.13739. - ISSN 15512916(eISSN)
Примечания : 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.
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Atuchin V. V., Aleksandrovsky A. S., Molokeev M. S.
Заглавие : Preparation of NaSrLa(WO4)3:Ho3+/Yb3+ ternary tungstates and their upconversion photoluminescence properties
Место публикации : Mater. Lett.: Elsevier, 2016. - Vol. 181. - P.38-41. - ISSN 0167577X (ISSN), DOI 10.1016/j.matlet.2016.05.121
Примечания : Cited References: 24. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2015-058813), SB RAS Program No.II.2P (No. 0358-2015-0012) and Russian Foundation for Basic Research (15-52-53080).
Предметные рубрики: VIBRATIONAL PROPERTIES
LUMINESCENCE PROPERTIES
MODULATED STRUCTURE
PHOSPHORS
CRYSTAL
RED
Ключевые слова (''Своб.индексиров.''): tungstate--phosphor--sol-gel preparation--luminescence--raman spectroscopy--xrd
Аннотация: NaSrLa1-x(WO4)3:Ho3+/Yb3+ ternary tungstates were synthesized via microwave sol-gel route. Well-crystallized particles with particle sizes of 2-5 ?m were obtained after heat-treatment at 900 °C for 16 h. Under the excitation at 980 nm, the particles showed yellow emissions based on the strong 545 and 655 nm emission bands. The preferable Yb3+:Ho3+ ratio was obtained to be 9:1. Raman spectra of the doped particles indicated the presence of strong Ho3+ luminescence lines. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated. © 2016 Published by Elsevier B.V.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarov N. P., Popov A. K., Timofeev V. P.
Заглавие : Effective upconversion of CO2-laser radiation in sodium vapors
Разночтения заглавия :авие SCOPUS: Effective upconversion of CO2-laser radiation in sodium vapors
Место публикации : Appl. Phys. B. - 1983. - Vol. 30, Is. 1. - P.53-55. - ISSN 0721-7269, DOI 10.1007/BF00692659
Примечания : Cited References: 17
Ключевые слова (''Своб.индексиров.''): 42.65--42.80--lasers, carbon dioxide--sodium and alloys--light
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Ikonnikov D. A., Atuchin V. V.
Заглавие : Triple molybdate scheelite-type upconversion phosphor NaCaLa(MoO4)3:Er3+/Yb3+: Structural and spectroscopic properties
Место публикации : Dalton Trans.: Royal Society of Chemistry, 2016. - Vol. 45, Is. 39. - P.15541-15551. - ISSN 14779226 (ISSN), DOI 10.1039/c6dt02378a
Примечания : Cited References: 71
Ключевые слова (''Своб.индексиров.''): light emission--optical properties--phosphors--sol-gel process--sol-gels--tungstate minerals--after-heat treatment--crystallized particles--homogeneous morphology--photoluminescence emission--spectroscopic property--triple molybdates--up-conversion emission--upconversion phosphors--optical emission spectroscopy
Аннотация: Triple molybdate NaCaLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.05 and y = 0.45, x = 0.1 and y = 0.2, x = 0.2 and y = 0) phosphors were successfully synthesized for the first time by the microwave sol-gel method. Well-crystallized particles formed after heat treatment at 900 °C for 16 h showed a fine and homogeneous morphology with particle sizes of 2-3 ?m. The structures were refined by the Rietveld method in the space group I41/a. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under excitation at 980 nm, the NaCaLa0.7(MoO4)3:0.1Er3+,0.2Yb3+ and NaCaLa0.5(MoO4)3:0.05Er3+,0.45Yb3+ particles exhibited a strong 525 nm emission band, a weaker 550 nm emission band in the green region, and three weak 655 nm, 490 nm and 410 nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail. © 2016 The Royal Society of Chemistry.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ikonnikov D. A., Voronov V. N., Molokeev M. S., Aleksandrovsky A. S.
Заглавие : Upconversion luminescence of CsScF4 crystals doped with erbium and ytterbium
Коллективы : Russian Foundation for Basic Research [15-52-53080]; Russian President [SS-7612.2016.2, 0358-2015-0012, II.2P]
Место публикации : Opt. Mater.: Elsevier Science, 2016. - Vol. 60. - P.584-589. - ISSN 0925-3467, DOI 10.1016/j.optmat.2016.09.016. - ISSN 1873-1252(eISSN)
Примечания : Cited References:33. - The authors are grateful to D. L. Chertkova for excellent technical assistance. The work was partially supported by the Russian Foundation for Basic Research Grant 15-52-53080, by the Russian President Grant SS-7612.2016.2, and by Project No0358-2015-0012 of SB RAS Program NoII.2P.
Предметные рубрики: MODULATED STRUCTURE
LANTHANIDE
NANOCRYSTALS
PHOSPHORS
Ключевые слова (''Своб.индексиров.''): fluoride crystals--erbium--ytterbium--up-conversion--luminescence--crystal structure--power dependence--pump wavelength dependence
Аннотация: Tetragonal CsScF4 crystals doped with (5 at.%) Er and Er/Yb (0.5 at.%/5 at.%) are grown and their crystal structure is determined to belong to Pmmn space group. Er and Yb ions are shown to occupy distorted octahedral Sc sites with the center of inversion. Bright visible upconversion luminescence was observed under 970-980 nm pumping with red (4F9/2), yellow (4S3/2) and green (2H11/2) bands of comparable intensity. UCL tuning curves maximize at 972 nm (CSF:Er) and at 969.7 nm (CSF:Er,Yb) pumping wavelengths. Different ratios between yellow-green and red luminescence intensities in CSF:Er and CSF:Er, Yb are explained by contribution of cross-relaxation in CSF:Er UCL UC in CSF:Er is a three stage process while UC in CSF:Er, Yb is a two stage process. The peculiarities of power dependences are explained by the power-dependent repopulation between starting levels of UC. (C) 2016 Elsevier B.V. All rights reserved.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Atuchin V. V., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S.
Заглавие : Incommensurately modulated structure and spectroscopic properties of CaGd2(MoO4)4:Ho3+/Yb3+ phosphors for up-conversion applications
Место публикации : J. Alloys Compd.: Elsevier, 2017. - Vol. 695. - P.737-746. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2016.06.134
Примечания : Cited References: 60. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (2015-058813) and the Russian Foundation for Basic Research (15-52-53080). VVA, ASA and ASO were partially supported by the Ministry of Education and Science of the Russian Federation.
Ключевые слова (''Своб.индексиров.''): modulation--molybdate--raman--sol-gel synthesis--upconversion--xrd
Аннотация: CaGd2(MoO4)4:Ho3+/Yb3+ phosphors doped by Ho3+ and Yb3+ (Ho3+ = 0 and 0.05, and Yb3+ = 0, 0.35, 0.40, 0.45 and 0.50) were successfully synthesized by the microwave sol-gel method. The synthesized particles, being formed after heat-treatment at 900 °C for 16 h, showed a well crystallized morphology. All compounds are (3 + 2)D incommensurately modulated with superspace group I41/a(α,β,0)00(-β,α,0)00. It was found that parameter (α2 + β2)1/2 is proportional to cell parameter a for all studied compositions and, therefore, modulation vector k is the same for all known CaRE2(MoO4)4 compounds. The modulation vector invariance is a specific and valuable feature of this type of the structure. Under the excitation at 980 nm, the doped particles exhibited the yellow emission composed of green (545-nm) and red (655-nm) emission bands due to frequency upconversion (UC). The pump power dependence and CIE chromaticity of the UC emission were evaluated. The shape of UC bands in CaGd2(MoO4)4:Ho3+/Yb3+ is dependent on the Yb content due to the influence of the crystal field affecting a holmium ion. 13 Raman-active modes of the CaGd2(MoO4)4 lattice were identified via a comparison of experimental Raman spectra and the lattice dynamics simulation results. Four additional Raman lines were found in the region of stretching vibrations and, at least, two additional modes are present in the bending mode region. These additional modes are ascribed to incommensurate crystal lattice modulation. Luminescence bands of Ho ions are severely broadened due to a statistical disorder in the CaGd2−xYby (MoO4)4 lattice.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Atuchin V. V., Molokeev M. S., Park, Hee Kook, Lee, Beom Hyun, Won, Dong Min, Oh, Won-Chun, Lim, Chang Sung
Заглавие : Microwave sol-gel derived MMoO4 (M=Ba,Cs,Sr) nanoparticles doped with Er/Yb, Ho/Yb, Ho/Yb/Tm and their upconversion photoluminescence properties for biomedical applications
Коллективы : International Conference on Multifunctional Materials and Application
Место публикации : The 10th International conference on multifunctional materials and application. - 2016. - Ст.43-P. - P.76
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang, Ningzi, Molokeev M. S., Liu, Quanlin, Xia, Zhiguo
Заглавие : Pure red upconversion luminescence and optical thermometry of Er3+ doped sensitizer-rich SrYbInO4 phosphors
Место публикации : J. Mater. Chem. C. - 2018. - Vol. 6, Is. 27. - P.7361-7366. - ISSN 2050-7526, DOI 10.1039/c8tc02565g. - ISSN 2050-7534(eISSN)
Примечания : Cited References:34. - The present work was supported by the National Natural Science Foundation of China (Grant 91622125, 51722202 and 51572023) and the Natural Science Foundations of Beijing (2172036), and M. Molokeev acknowledges support of the Russian Foundation for Basic Research (17-52-53031).
Предметные рубрики: TEMPERATURE-SENSING BEHAVIOR
EMISSION
NANOCRYSTALS
LANTHANIDE
Аннотация: Er3+ doped sensitizer-rich SrYbInO4 upconversion phosphors with an orthorhombic structure (Pnma) were synthesized by using a high temperature solid state reaction and their phase structure, site occupation and microstructure have been analyzed. Interestingly, upon the excitation from 980 nm pulsed laser diodes, the SrYbInO4:Er3+ phosphor emitted a nearly pure red emission on account of the 4F9/2 → 4I15/2 transition of Er3+. Additionally, based on the pump power dependence of the upconversion intensity and the schematic diagram of the energy levels, the upconversion mechanism in this system was verified in a two-photon process. The temperature-dependent behaviors of the as-synthesized sample demonstrated the potential for applications in optical thermometry.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shi X., Molokeev M. S., Wang X., Wang Z., Zhu Q., Li J. -G.
Заглавие : Crystal structure of NaLuW2O8·2H2O and down/upconversion luminescence of the derived NaLu(WO4)2:Yb/Ln phosphors (Ln = Ho, Er, Tm)
Место публикации : Inorg. Chem. - 2018. - Vol. 57, Is. 17. - P.10791-10801. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.8b01427
Примечания : Cited References: 60
Аннотация: Hydrothermally reacting Lu(NO)3 and Na2WO4·2H2O at 200 °C and pH = 8 produced the new compound NaLuW2O8·2H2O, which was analyzed via the Rietveld technique to crystallize in the orthorhombic system (space group: Cmmm) with cell parameters a = 21.655(1), b = 5.1352(3), and c = 3.6320(2) Å and cell volume V = 403.87(4) Å3. The crystal structure presents -(NaO6)-(NaO6)- and -(LuO4(H2O)2WO5)-(LuO4(H2O)2WO5)- alternating layers linked together by the O2- ion common to NaO6 octahedron and WO5 triangle bipyramid. Tetragonal structured and phase-pure Na(Lu0.87Ln0.03Yb0.1)(WO4)2 phosphors (Ln = Ho, Er, and Tm) were directly produced by calcining their NaLuW2O8·2H2O analogous precursors at 600 °C for 2 h, followed by a detailed study of their downconversion/upconversion (DC/UC) photoluminescence. It was shown that the UC luminescence is dominated by a red band at ∼650 nm for Ho3+ (5F5 →5I8 transition), green bands at ∼500-575 nm for Er3+ (2H11/2/4S3/2 →4I15/2 transitions) and a blue band at ∼476 nm for Tm3+ (1G4 →3H6 transition), all via a three-photon process. DC luminescence of the phosphors is characterized by a ∼545 nm green emission for Ho3+ (5F4/5S2 →5I8 transition, ex = 453 nm), ∼500-575 nm green emissions for Er3+ (2H11/2/4S3/2 →4I15/2 transitions, ex = 380 nm), and a ∼455 nm blue emission for Tm3+ (1D2 →3F4 transition, ex = 360 nm), with CIE chromaticity coordinates of around (0.27, 0.71), (0.26, 0.72), and (0.15, 0.04), respectively.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Aleksandrovsky A. S., Atuchin V. V., Molokeev M. S., Oreshonkov A. S.
Заглавие : Microwave sol-gel synthesis, microstructural and spectroscopic properties of scheelite-type ternary molybdate upconversion phosphor NaPbLa(MoO4)3:Er3+/Yb3+
Место публикации : J. Alloys Compd. - 2020. - Vol. 826. - Ст.152095. - ISSN 0925-8388 (ISSN), DOI 10.1016/j.jallcom.2019.152095. - ISSN 1873-4669 (eISSN)
Примечания : Cited References: 53. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2018R1D1A1A09082321). This study was supported by the Russian Science Foundation (19-42-02003, in part of conceptualization). Also, this study was supported by RFBR (18-32-20011, 18-03-00750).
Аннотация: New ternary molybdate NaPbLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.05 and y = 0.35, 0.4, 0.45 and 0.5) phosphors were successfully fabricated by the MSG (microwave sol-gel) method, and the microstructural and spectroscopic properties were characterized. The crystal structure of NaPbLa(MoO4)3 (NPLM) was defined by Rietveld analysis in space group I41/a with unit cell parameters a = 5.3735(2) and c = 11.8668(4) Å, V = 342.65(3) Å3, Z = 4 (RB = 6.64%). The unit cell volume of NaPbLa(MoO4)3 (NPLM) was intermediate between those of NaLa(MoO4)2 and PbMoO4. Under the 980 nm excitation, upconverted yellowish-green emissions at transitions from 2H11/2 and 4S3/2 were observed. No concentration quenching in the subsystem of donor ions at the content up to 50 at.% and no cross-relaxation losses in the subsystem of acceptor ions at the concentrations as high as 5 at. % were verified. The individual chromaticity points for the NaPbLa(MoO4)3:Er3+,Yb3+ phosphors, corresponding to the equal-energy point in the standard CIE diagram, revealed yellowish-green emissions.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Razumkova I. A., Denisenko Yu. G., Boyko A. N., Ikonnikov D. A., Aleksandrovsky A. S., Azarapin N. O., Andreev O. V.
Заглавие : Synthesis and Upconversion Luminescence in LaF3:Yb3+, Ho3+, GdF3: Yb3+, Tm3+ and YF3:Yb3+, Er3+ obtained from Sulfide Precursors
Место публикации : Z. Anorg. Allg. Chem. - 2019. - Vol. 645, Is. 24. - P.1393-1401. - ISSN 0044-2313, DOI 10.1002/zaac.201900204; J. Inorg. General Chem. - ISSN 1521-3749 (eISSN)
Примечания : Cited References: 57. - The authors would like to thank the staff of the Engineering Center of the Tyumen State University (special Alexej V. Matigorov) for their help in carrying out physical and chemical tests.
Аннотация: Rare earth fluorides are mainly obtained from aqueous solutions of oxygen‐containing precursors. Probably, this method is simple and efficient, however, oxygen may partially be retained in the fluoride structure. We offer an alternative method: obtaining fluorides and solid solutions based on them from an oxygen‐free precursor. As starting materials, we choose sulfides of rare‐earth elements and solid solutions based on them. The fluorination is carried out by exposure to hydrofluoric acid of various concentrations. The transmission electron microscopy images revealed the different morphologies of the products, which depend on the concentration of the fluorinating component (HF) and the host element. The solid solution particle size varied from 30–35 nm in the case of GdF3:Yb3+, Tm3+ (4 % HF) to larger structures with dimensions exceeding 200 nm, such as that for LaF3:Yb3+, Ho3+ (40 % HF). The thermal characteristics, such as the temperatures of the transitions and melting and enthalpies, were determined for the solid solutions and simple fluorides. Applicability of the materials obtained as biological luminescent markers was tested on the example of upconversion luminescence, and good upconversion properties were detected.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Atuchin V. V., Aleksandrovsky A. S., Denisenko, Yuriy G., Molokeev M. S., Oreshonkov A. S.
Заглавие : Fabrication of Microcrystalline NaPbLa(WO4)3:Yb3+/Ho3+ Phosphors and Their Upconversion Photoluminescent Characteristics
Место публикации : Kor. J. Mater. Res. - 2019. - Vol. 29, Is. 12. - P.741-746. - ISSN 1225-0562, DOI 10.3740/MRSK.2019.29.12.741. - ISSN 2287-7258 (eISSN)
Примечания : Cited References: 28. - This study was supported by the Research Program through the Campus Research Foundation funded by Hanseo University in 2019 (191Yunghap09) and the Russian Science Foundation (19-42-02003). The authors are grateful for the support from RFBR, according to the research project 18-32-20011.
Аннотация: New triple tungstate phosphors NaPbLa(WO4)3:Yb3+/Ho3+ (x = Yb3+/Ho3+ = 7, 8, 9, 10) are successfully fabricated by microwave assisted sol-gel synthesis and their structural and frequency upconversion (UC) characteristics are investigated. The compounds crystallized in the tetragonal space group I41/a and the NaPbLa(WO4)3 host have unit cell parameters a = 5.3927(1) and c = 11.7961(3) Å, V = 343.05(2) Å3, Z = 4. Under excitation at 980 nm, the phosphors have yellowish green emissions, which are derived from the intense 5S2/ 5F4 → 5I8 transitions of Ho3+ ions in the green spectral range and strong 5F5 → 5I8 transitions in the red spectral range. The optimal Yb3+:Ho3+ ratio is revealed to be x = 9, which is attributed to the quenching effect of Ho3+ ions, as indicated by the composition dependence. The UC characteristics are evaluated in detail under consideration of the pump power dependence and Commission Internationale de L'Eclairage chromaticity. The spectroscopic features of Raman spectra are discussed in terms of the superposition of Ho3+ luminescence and vibrational lines. The possibility of controlling the spectral distribution of UC luminescence by the chemical content of tungstate hosts is demonstrated.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Guan M., Molokeev M. S., Zhou J.
Заглавие : Atomic deciphering of cation exchange mechanism in upconversion nanoparticles
Место публикации : J. Lumin. - 2020. - Vol. 224. - Ст.117289. - ISSN 00222313 (ISSN), DOI 10.1016/j.jlumin.2020.117289
Примечания : Cited References: 36. - The authors acknowledge the Science and Technology Innovation Committee of Shenzhen (Grant No. KQTD20170810110913065), Australian Research Council (ARC) Discovery Early Career Researcher Award Scheme (J. Z., DE 180100669), and the China Scholarship Council (Ming Guan, No. 201506400025)
Аннотация: Transition metal ion doping in upconversion nanoparticles (UCNPs) provides an effective way to enhance the luminescence for their wide array of applications. However, the doping sites of transition metal ions have not been comprehensively explored, and commonly assumed that transition metal ions replace the trivalent lanthanides within the lattice. Here we report that cation exchange of transition metal (Mn2+) in β-NaYF4:Yb3+/Er3+ UCNPs occurs through alkaline metal (Na+) replacement, via 2Na+ ↔ Mn2+ + Vacancy reaction. This process distorts the LnF9 polyhedrons and tailors the surrounding environment around the trivalent lanthanides, thereby improving the upconversion intensity from active lanthanides. Further confirmed by core-shell design and spectroscopic study, we prove that the transition–alkaline metal exchange enables both the emission enhancement and transition probability variation of activators.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Aleksandrovsky A. S., Atuchin V., Molokeev M. S., Oreshonkov A. S.
Заглавие : Microwave-employed sol–gel synthesis of scheelite-type microcrystalline AgGd(MoO4)2:Yb3+/Ho3+ upconversion yellow phosphors and their spectroscopic properties
Место публикации : Crystals. - 2020. - Vol. 10, Is. 11. - Ст.1000. - P.1-14. - ISSN 20734352 (ISSN), DOI 10.3390/cryst10111000
Примечания : Cited References: 58. - This study was supported by the Research Program through the Campus Research Foundation funded by Hanseo University in 2020 (201Yunghap09)
Аннотация: AgGd(MoO4)2:Ho3+/Yb3+ double molybdates with five concentrations of Ho3+ and Yb3+ were synthesized by the microwave employed sol–gel based process (MES), and the crystal structure variation, concentration effects, and spectroscopic characteristics were investigated. The crystal structures of AgGd1−x−yHoxYby(MoO4)2 (x = 0, 0.05; y = 0, 0.35, 0.4, 0.45, 0.5)at room temperature were determined in space group I41/a by Rietveld analysis. Pure AgGd(MoO4)2 has a scheelite-type structure with mixed occupations of (Ag,Gd) sites and cell parameters a = 5.24782 (11) and c = 11.5107 (3) Å, V = 317.002 (17) Å3, Z = 4. In doped samples, the sites are occupied by a mixture of (Ag,Gd,Ho,Yb) ions, which provides a linear cell volume decrease with the doping level increase. Under the excitation at 980 nm, AGM:0.05Ho,yYb phosphors exhibited a yellowish green emission composed of red and green emission bands according to the strong transitions 5F5 → 5I8 and 5S2/5F4 → 5I8 of Ho3+ ions. The evaluated photoluminescence and Raman spectroscopic results were discussed in detail. The upconversion intensity behavior dependent on the Yb/Ho ratio is explained in terms of the optimal number of Yb3+ ions at the characteristic energy transfer distance around the Ho3+ ion.
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