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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. I., Snytnikov V. N., Snytnikov V. N., Ishchenko A. V., Rakhmanova M. I., Molokeev M. S., Krylov A. S., Aleksandrovsky A. S.
Заглавие : Luminescence of monoclinic Y2O3:Eu nanophosphor produced via laser vaporization
Место публикации : Opt. Mater. - 2020. - Vol. 104. - Ст.109843. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2020.109843
Примечания : Cited References: 19. - This work is financially supported by the Russian Foundation for Basic Research № 19-32-60027
Аннотация: Europium doped Y2O3spherical nanoparticles with the diameter ~10 nmobtained via cw laser vaporization are shown to crystallize in monoclinic symmetry class (C2/m space group). The size of nanoparticles established via HRTEM coincides with coherent scattering region established by XRD. Luminescence spectrum in the vicinity of ultranarrow transition demonstrates three peaks consistent with three inequivalent positions of Eu3+ ion in monoclinic Y2O3 lattice. Hypersensitive transition dominates in the spectrum, admitting the lack of inversion symmetry at Cs sites occupied by Eu3+. The spectrum of hypersensitive transition is expanded to the red part of spectrum due intense transitions terminating at higher-lying components of crystal-field-split 7F2 energy level. Obtaining chromaticity coordinates (0.669, 0.331)and absolute quantum yield (~21%) is possible using red phosphor based on monoclinic Y2O3:Eu3+.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su B., Song G., Molokeev M. S., Lin Z., Xia Z.
Заглавие : Synthesis, crystal structure and green luminescence in zero-dimensional tin halide (C8H14N2)2SnBr6
Место публикации : Inorg. Chem. - 2020. - Vol. 59, Is. 14. - P.9962–9968. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.0c01103
Примечания : Cited References: 33. - This work is supported by the National Natural Science Foundation of China (51961145101, 51722202, and 51972118), Fundamental Research Funds for the Central Universities (D2190980), Guangzhou Science & Technology Project (202007020005), and the Guangdong Provincial Science & Technology Project (No. 2018A050506004), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to Research Project No. 19-52-80003
Аннотация: Organic-inorganic hybrid metal halides with broad-band emission are currently receiving an increasing interest for their unique light emission properties. Here we report a novel lead-free zero-dimensional (0D) tin halide, (C8H14N2)2SnBr6, in which isolated [SnBr6]4- octahedrons are cocrystallized with organic cations, 1,3-bis(aminomethyl)benzene (C8H14N22+). Upon photoexcitation, the bulk crystals exhibit broad-band green emission peaking at 507 nm with a full width at half-maximum (fwhm) of 82 nm (0.395 eV), a Stokes shift of 157 nm (1.09 eV), and a photoluminescence quantum yield (PLQY) of 36 ± 4%. Combined structural analysis and density functional theory (DFT) calculations indicate that the excited state structural distortion of [SnBr6]4- octahedral units account for the formation of this green emission. The relatively small Stokes shift and narrow fwhm of the emission are hence caused by the reduced distortion of [SnBr6]4- octahedrons and rigid molecular structure. The discovery of lead-free (C8H14N2)2SnBr6 and insight into the mechanism of green emission provide an essential platform toward unveiling the relationship between structure and property for 0D metal halide perovskites.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Денисова Л. Т., Молокеев, Максим Сергеевич, Крылов, Александр Сергеевич, Александровский, Александр Сергеевич, Иртюго Л. А., Белецкий В. В., Денисов В. М.
Заглавие : Синтез, кристаллическая структура, люминесценция и теплофизические свойства TbGaGe2O7
Место публикации : Физ. тверд. тела. - 2021. - Т. 63, Вып. 1. - С. 76-79. - ISSN 0367-3294, DOI 10.21883/FTT.2021.01.50401.190
Примечания : Библиогр.: 11. - Авторы выражают благодарность Красноярскому региональному центру коллективного пользования ФИЦ КНЦ СО РАН
Аннотация: Твердофазным методом из исходных оксидов Tb2O3, Ga2O3 и GeO2 синтезирован германат TbGaGe2O7. С использованием рентгеновской дифракции определена его структура. При комнатной температуре измерены спектры люминесценции. Методом дифференциальной сканирующей калориметрии исследовано влияние температуры на теплоемкость оксидного соединения. По экспериментальным данным Cp=f(T) рассчитаны термодинамические свойства.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ji, Haipeng, Hou, Xinghui, Molokeev M. S., Ueda, Jumpei, Tanabe, Setsuhisa, Brik M. G., Zhang, Zongtao, Wang, Y.u., Chen, Deliang
Заглавие : Ultrabroadband red luminescence of Mn4+ in MgAl2O4 peaking at 651 nm
Место публикации : Dalton Trans. - 2020. - Vol. 49, Is. 17. - P.5711-5721. - ISSN 1477-9226, DOI 10.1039/d0dt00931h. - ISSN 1477-9234(eISSN)
Примечания : Cited References: 54. - This study was partly supported by the National Natural Science Foundation of China (Grant No. 51902291 and 51574205), the China Postdoctoral Science Foundation (2019M662524, 2019M652574), the Postdoctoral Research Sponsorship in Henan Province (19030025, 001802045), the Natural Science Foundation of Guangdong Province (2018B030311022), the Guangdong Innovation Research Team for Higher Education (2017KCXTD030), and the High-level Talents Project of Dongguan University of Technology (KCYKYQD2017017). J. U. and S. T. were also supported by the JSPS KAKENHI (16H06441, 19H02798) and M. M. was also supported by the RFBR (19-52-80003).
Предметные рубрики: EMITTING PHOSPHOR
PHOTOLUMINESCENCE PROPERTIES
PHASE-TRANSITION
Аннотация: Blue light pumped red luminescence with broadband and high photon-energy emission is highly desired for phosphor-converted white light-emitting diodes (pc-wLEDs), to achieve a high color rendering index and high luminous efficacy. Mn4+-doped red-emitting phosphors generally exhibit sharp vibronic emissions associated with the parity- and spin-forbidden 2Eg → 4A2g transitions. In this paper, two abnormal luminescence behaviors were observed for Mn4+ in the MgAl2O4:Mn4+ spinel phosphor with a short wavelength emission band peaking at 651 nm. Firstly, the Mn4+ 2Eg → 4A2g transition exhibits ultrabroadband luminescence in MgAl2O4 and the large full-width at half-maximum (FWHM) is dependent both on the calcination temperature and on the partial substitution of Al3+ with Ga3+. Secondly, the thermal quenching behavior of the Mn4+ 2Eg → 4A2g luminescence in MgAl2O4 shows a dependence on its thermal treatment and preparation method. The Rietveld refinement and Raman results demonstrate that the variation in the FWHM of the luminescence spectra is a sum effect of structural ordering (i.e., isotropic displacement decrease of constituent atoms) and the Mg ↔ Al anti-site disorder. A model for the observed varying thermal quenching of luminescence was tentatively proposed. The intrinsic thermal quenching temperature of Mn4+ luminescence in MgAl2O4 was found to be 390–400 K using the samples prepared by the co-precipitation and molten salt methods. The present work gives a novel perspective to understand the luminescence spectra of Mn4+ 2Eg → 4A2g transition.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Qiao, Jianwei, Ning, Lixin, Molokeev M. S., Chuang, Yu-Chun, Liu, Quanlin, Xia, Zhiguo
Заглавие : Eu2+ site preferences in the mixed cation K2BaCa(PO4)2 and thermally stable luminescence
Место публикации : J. Am. Chem. Soc. - 2018. - Vol. 140, Is. 30. - P.9730-9736. - ISSN 0002-7863, DOI 10.1021/jacs.8b06021
Примечания : Cited References: 40. - This work is supported by the National Natural Science Foundation of China (No. 51722202, 91622125, 51572023, and 11574003), Natural Science Foundations of Beijing (2172036) and M.M. acknowledges support of the Russian Foundation for Basic Research (17-52-53031).
Предметные рубрики: LIGHT-EMITTING-DIODES
SOLID-SOLUTION
PHOSPHORS
GREEN
BLUE
Аннотация: Site preferences of dopant Eu2+ on the locations of K+, Ba2+, and Ca2+ in the mixed cation phosphate K2BaCa(PO4)2 (KBCP) are quantitatively analyzed via a combined experimental and theoretical method to develop a blue-emitting phosphor with thermally stable luminescence. Eu2+ ions are located at K2 (M2) and K3 (M3) sites of KBCP, with the latter occupation relatively more stable than the former, corresponding to emissions at 438 and 465 nm, respectively. KBCP:Eu2+ phosphor exhibits highly thermal stable luminescence even up to 200 °C, which is interpreted as due to a balance between thermal ionization and recombination of Eu2+ 5d excited-state centers with the involvement of electrons trapped at crystal defect levels. Our results can initiate more exploration of activator site engineering in phosphors and therefore allow predictive control of photoluminescence tuning and thermally stable luminescence for emerging applications in white LEDs.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang X., Shi X., Molokeev M. S., Wang Z., Zhu Q., Li X., Sun X., Li J. -G.
Заглавие : NaLaW2O7(OH)2(H2O): Crystal structure and RE3+ luminescence in the pristine and annealed double tungstates (RE = Eu, Tb, Sm, and Dy)
Место публикации : Inorg. Chem. - 2018. - Vol. 57, Is. 21. - P.13606–13617. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.8b02228
Примечания : Cited References: 71. - This work is supported in part by the National Natural Science Foundation of China (Grants 51702020 and 51672039), the Doctoral Research Fund of Liaoning Province (Grant 20170520103), and RFBR via Research Project 17-52-53031.
Аннотация: Hydrothermal reaction of La(NO3)3 and Na2WO4·2H2O at 100 °C and pH 8 resulted in the formation of new compound NaLaW2O7(OH)2(H2O), as confirmed by the X-ray diffraction results, chemical composition, Fourier transform infrared, thermogravimetric/differential thermal analysis, and transmission electron microscopy analyses. The crystal structure was determined in the triclinic system (space group P1̅), with lattice constants a = 5.8671(2) Å, b = 8.2440(2) Å, and c = 9.0108(3) Å, axis angles α = 93.121(2)°, β = 75.280(2)°, and γ = 94.379(2)°, and cell volume V = 420.03(2) Å3. The structure contains two-dimensional layers of -(W1O6)-(W1O6)-(W2O6)-(W2O6)-(W1O6)-(W1O6)- and -LaO9-LaO9- chains alternating in the a–b plane, which are linked together through NaO6 octahedral trigonal prisms by edges to form a three-dimensional net. Dehydration of the compound proceeds up to a low temperature of ∼350 °C and results in the formation of technologically important NaLa(WO4)2 double tungstate, which is thus a unique precursor for the latter. Na(La,RE)W2O7(OH)2(H2O) and Na(La,RE)(WO4)2 solid solutions separately doped with the practically important activators for which RE = Eu, Tb, Sm, and Dy were also successfully synthesized and investigated for their structural features and photoluminescence properties, including excitation, emission, quantum yield, emission color, and fluorescence decay kinetics. The compounds were shown to exhibit dominantly strong red (∼616 nm for Eu3+; λex = 395 or 464 nm), green (∼545 nm for Tb3+; λex = 278 or 258 nm), deep red (∼645 nm for Sm3+; λex = 251 nm), and yellow (∼573 nm for Dy3+; λex = 254 nm) emission upon being irradiated with the peak wavelengths of their strongest excitation bands.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gao P., Li Q., Zhou C., Chen K., Luo Z., Zhang S., Molokeev M. S., Wang J., Zhou Z., Xia M.
Заглавие : High-efficiency continuous-luminescence-controllable performance and antithermal quenching in Bi3+-activated phosphors
Место публикации : Inorg. Chem. - 2022. - Vol. 61, Is. 33. - P.13104-13114. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.2c01784
Примечания : Cited References: 52. - The authors gratefully acknowledge funds from the National Natural Science Foundation of China (Grant 51974123), the Distinguished Youth Foundation of Hunan Province (Grant 2020JJ2018), the Key R&D Projects in Hunan Province (2020WK2016, 2020SK2032, 2021SK2047, and 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant 2021JJ40261), the Hunan High Level Talent Gathering Project (2020RC5007), Changsha Science and Technology Plan (KH2005114 and KH2201428), Hunan Graduate Scientific Research Innovation Project (2022XC017), and the College Students’ Innovative Training (s202210537079x)
Аннотация: Recently, Bi3+-activated phosphors have been widely researched for phosphor-converted light-emitting diode (pc-LED) applications. Herein, novel full-spectrum A3BO7:Bi3+ (A = Gd, La; B = Sb, Nb) phosphors with a luminescence-tunable performance were achieved by a chemical substitution strategy. In the La3SbO7 host material, a new luminescent center was introduced, with Gd3+ replacing La3+. The photoluminescence (PL) spectra show a large blue shift from 520 to 445 nm, thus achieving regulation from green to blue lights. Moreover, a series of solid solution-phase phosphors La3Sb1-xNbxO7:Bi3+ were prepared by replacing Sb with Nb, and a PL spectral tunability from green (520 nm) to orange-red (592 nm) was realized. Temperature-dependent PL spectra show that La3-xGdxSbO7:Bi3+ phosphors have excellent thermal stability. Upon 350 nm excitation, the PL intensity of La3-xGdxSbO7:Bi3+ phosphors at 150 °C remained at more than 93% at room temperature. With Gd3+ doping, the thermal stability gradually improved, and LaGd2SbO7:0.03Bi3+ represents splendid antithermal quenching (135.2% at 150 °C). Finally, a full-visible spectrum for pc-LED with a high color-rendering index (Ra = 94.4) was obtained. These results indicated that chemical substitution is an effective strategy to adjust the PL of Bi3+, which is of great significance in white-light illumination and accurate plant lighting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyu, Kuangnan, Liu, Gaochao, Molokeev M. S., Xia, Zhiguo
Заглавие : Double-site occupation triggered broadband and tunable NIR-I and NIR-II luminescence in AlNbO4:Cr3+ phosphors
Место публикации : Adv. Phys. Res. - 2023. - Vol. 2, Is. 4. - Ст.2200056. - ISSN 27511200 (eISSN), DOI 10.1002/apxr.202200056
Примечания : Cited References: 38. - This research was supported by the International Cooperation Project of the National Key Research and Development Program of China (2021YFB3500400 and 2021YFE0105700), National Natural Science Foundations of China (Grant No. 51972118), Guangzhou Science & Technology Project (202007020005), the State Key Laboratory of Luminescent Materials and Devices (Skllmd-2022-02), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01×137). This work was also funded by RFBR according to the research project No. 19-52-80003
Аннотация: Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr3+-doped AlNbO4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr3+ emitters in different Al3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO4:Cr3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr3+-doped AlNbO4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Александровский, Александр Сергеевич, Вьюнышев, Андрей Михайлович, Гудим, Ирина Анатольевна, Соколов, Алексей Эдуардович, Крылов, Александр Сергеевич
Заглавие : Люминесценция ионов туллия в хантитах
Коллективы : Международная школа-семинар по люминесценции и лазерной физике
Место публикации : XI Международная школа-семинар по люминесценции и лазерной физике: 27 - 31 октября 2008 г., Иркутск, Россия : тезисы лекций и докладов. - 2008. - С. 6
Примечания : Работа выполняется при поддержке гранта РФФИ 05-02-00704
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