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    Optical functional units in zero-dimensional metal halides as a paradigm of tunable photoluminescence and multicomponent chromophores / M. Z. Li, M. S. Molokeev, J. Zhao, Z. G. Xia // Adv. Opt. Mater. - 2020. - Vol. 8, Is. 8. - Ст. 1902114, DOI 10.1002/adom.201902114. - Cited References: 38. - This work was supported by the National Natural Science Foundation of China (Nos. 51961145101, 51722202, and 51972118), Fundamental Research Funds for the Central Universities (D2190980), the Guangdong Provincial Science & Technology Project (2018A050506004), and this work was also funded by RFBR according to the Research Project No. 19-52-80003 . - ISSN 2195-1071
   Перевод заглавия: Оптические функциональные элементы в 0D металлгалогенидах как парадигма перестраиваемой фотолюминесценции многокомпонентных хромофоров

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
PEROVSKITES
   LUMINESCENCE
   ABSORPTION
   EMISSION
Кл.слова (ненормированные):
hybrid metal halides -- optical functional applications -- structural design
Аннотация: Zero-dimensional (0D) organic–inorganic hybrid luminescent metal halides have many promising optoelectronic applications; however, the single building unit in the 0D framework restricts their multimode optical control and photoluminescence tuning. Thus, it remains urgent but challenging to rationally design distinct anionic polyhedral with different optical functions and further expand this family by an equivalent cation substitution and halogen replacement. Herein, (C9NH20)9[Pb3X11](MX4)2 (X = Br and Cl, M = Mn, Fe, Co, Ni, Cu, and Zn) is successfully synthesized verifying the rationality of the design philosophy, and the optical characterizations demonstrate the effects of X‐position anions and M‐position cations on luminescence process. Intriguingly, both [Pb3X11]5− and [MX4]2− perform as inorganic building units in this 0D system and optically active centers, in which the former leads to high‐efficiency broad‐band yellow/green emission originating from self‐trapped excitons and the as‐observed multicomponent chromophores are derived from the absorption of the latter in the visible light region. The present work highlights the importance of different optical functional units showing synergistic effects on the physical properties and inspires future studies to explore multifunctional application of 0D luminescent metal halides.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Peoples R China.

Доп.точки доступа:
Li, Mingze; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Xia, Zhiguo
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    Tunable photoluminescence in Sb3+-doped zero-dimensional hybrid metal halides with intrinsic and extrinsic self-trapped excitons / J. Zhou, M. Z. Li, M. S. Molokeev [et al.] // J. Mater. Chem. C. - 2020. - Vol. 8, Is. 15. - P. 5058-5063, DOI 10.1039/d0tc00391c. - Cited References: 33. - This work is supported by the National Natural Science Foundation of China (No. 51722202, 51961145101, 51972118, 21576002 and 61705003), Fundamental Research Funds for the Central Universities (D2190980), the Guangdong Provincial Science & Technology Project (2018A050506004), and Beijing Technology and Business University Research Team Construction Project (No. PXM2019_014213_000007). This work was also funded by RFBR according to the Research Project No. 19-52-80003. . - ISSN 2050-7526. - ISSN 2050-7534
   Перевод заглавия: Перестраиваемая фотолюминесценция в нульмерных гибридных металлогалогенидах, легированных Sb3 +, с внутренними и внешними автолокализованными экситонами

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
WHITE-LIGHT EMISSION
   LUMINESCENCE
   PEROVSKITES
   CS2NASCCL6
   CS2NAYCL6
Аннотация: Dopants in luminescent metal halides provide an alternative way for photoluminescence tuning towards versatile optical applications. Here we report a trivalent antimony (Sb3+)-doped single crystalline 0D metal halide with the composition of (C9NH20)9[Pb3Cl11](ZnCl4)2:Sb3+. This compound possessed the coexistence of two emission centers including intrinsic and extrinsic self-trapped excitons (STEs), which are ascribed to [Pb3Cl11]5− clusters and triplet STEs formed by the 3P1–1S0 transition of Sb3+. By regulating the Sb3+ concentration, the emission can be tuned from green to yellow and finally to orange, which would help to develop optically pumped white light-emitting diodes (WLEDs) with different photometric characteristics. Moreover, this dopant-induced extrinsic STE approach presents a new direction towards tuning the luminescence properties of 0D metal halides, and may find application in environmentally-friendly, high-performance metal halide light emitters.

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Держатели документа:
Beijing Technol & Business Univ, Sch Sci, Beijing 100048, Peoples R China.
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
RAS, SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Peoples R China.

Доп.точки доступа:
Zhou, Jun; Li, Mingze; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sun, Jiayue; Xu, Denghui; Xia, Zhiguo
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    Two-site Cr3+ occupation in the MgTa2O6:Cr3+ phosphor toward broad-band near-infrared emission for vessel visualization / G. C. Liu, M. S. Molokeev, B. F. Lei, Z. G. Xia // J. Mater. Chem. C. - 2020. - Vol. 8, Is. 27. - P. 9322-9328, DOI 10.1039/d0tc01951h. - Cited References: 52. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51972118, 51961145101 and 51722202), Fundamental Research Funds for the Central Universities (D2190980), the Guangzhou Science & Technology Project (202007020005), 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 the research project No. 19-52-80003. . - ISSN 2050-7526. - ISSN 2050-7534
   Перевод заглавия: Заселение Cr3+ двух кристаллографических позиций в люминофоре MgTa2O6:Cr3+ для широкополосного ближнего инфракрасного излучения используемого для визуализации сосудов

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
LIGHT-SOURCES
   PHOSPHOR
   LUMINESCENCE
   PHOTOLUMINESCENCE
Аннотация: Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have great potential in photonic, optoelectronic and biological applications, while the discovery of a broad-band NIR phosphor still remains a challenge. Here, we report a novel Cr3+-activated MgTa2O6 phosphor with an asymmetrical emission band ranging from 700 to 1150 nm and a large full width at half maximum (FWHM) of 140 nm upon 460 nm blue light excitation. The broad spectrum is assigned to the overlap of two bands centered at 910 and 834 nm, which originate from the spin-allowed transition of 4T2 → 4A2 for different Cr3+ ions located in the two six-coordinated crystallographic sites of Mg2+ and Ta5+, respectively. The distribution of blood vessels and bones in human palm and wrist is observed with the assistance of a commercial NIR camera and a fabricated pc-LED, which demonstrates that the MgTa2O6:Cr3+ phosphor is promising in biological applications.

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Держатели документа:
South China Univ Technol, Sch Mat Sci & Technol, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Guangzhou 510640, Peoples R China.
Fed Res Ctr KSC SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Agr Univ, Coll Mat & Energy, Guangdong Prov Engn Technol Res Ctr Opt Agr, Guangzhou 510642, Peoples R China.

Доп.точки доступа:
Liu, Gaochao; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lei, Bingfu; Xia, Zhiguo
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Manifestations of Structural Phase Transitions in a Rb2KLuF6 Crystal in Its Raman Spectra / A. S. Krylov [et al.] // Opt. Spectrosc. - 2019. - Vol. 126, Is. 4. - P. 341-345, DOI 10.1134/S0030400X1904012X. - Cited References: 27. - This work was supported by the Russian Foundation for Basic Research, project nos. 16-02-00102, 18-02-00754. . - ISSN 0030-400X. - ISSN 1562-6911

РУБ Optics + Spectroscopy
Рубрики:
SCATTERING
   ELPASOLITES
   LUMINESCENCE
   TRANSFORMATIONS
   FLUORIDES
Аннотация: The Raman spectra of an Rb2KLuF6 crystal are studied in the temperature range from 8 to 375 K, which includes two phase transitions: one of which proceeds from a cubic to a tetragonal phase, while the other transition takes place from a tetragonal to a monoclinic phase. An analysis of the temperature dependences of parameters of spectral lines shows that the former transition is of the second kind, while the latter transition is of the first kind, close to the tricritical point. It is shown that the structural phase transitions in the Rb2KLuF6 double perovskite are not associated with disordering. The former transition is associated with rotations of LuF6 octahedra around the fourth-order axis, while the latter transition is related with rotations of octahedra and displacements of rubidium ions.

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Публикация на русском языке Проявление структурных фазовых переходов в кристалле Rb2KLuF6 в спектрах комбинационного рассеяния света [Текст] / А. С. Крылов [и др.] // Оптика и спектроскопия. - 2019. - Т. 126 Вып. 4. - С. 423-427

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Voronov, V. N.; Воронов, Владимир Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Russian Foundation for Basic Research [16-02-00102, 18-02-00754]
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    Facile synthesis of the desired red phosphor Li2Ca2Mg2Si2N6:Eu2+ for high CRI white LEDs and plant growth LED device / X. Yang [et al.] // J. Am. Ceram. Soc. - 2020. - Vol. 103, Is. 3. - P. 1773-1781, DOI 10.1111/jace.16858. - Cited References: 34. - National Natural Science Foundations of China, Grant/Award Number: 21671070 and 51802101; Project GDUPS; Natural Science Foundation of Guangdong Province, Grant/Award Number: 2018A030310217; Guangzhou Science & Technology Project, Grant/Award Number: 201704030086; Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams; National Undergraduate Innovation and Entrepreneurship Training Program granted for Gening Xie, Grant/Award Number: 201910564035 . - ISSN 0002-7820. - ISSN 1551-2916
   Перевод заглавия: Простой синтез красного люминофора Li2Ca2Mg2Si2N6: Eu2+, необходимого для белых светодиодов с высоким CRI, и светодиодных устройств для роста растений

РУБ Materials Science, Ceramics
Рубрики:
IN-GLASS
   LUMINESCENCE
   PERFORMANCE
   EFFICIENT
   EMISSION
   ROUTE
Кл.слова (ненормированные):
high CRI white LEDs -- Li2Ca2Mg2Si2N6:Eu2+ -- phosphor -- plant growth LED device
Аннотация: The red emission with suitable peak wavelength and narrow band is acutely required for high color rendering index (CRI) white LEDs without at the cost of the luminous efficacy. Herein, the Li2Ca2Mg2Si2N6:Eu2+ red phosphor was prepared with facile solid‐state method using Ca3N2, Mg3N2, Si3N4, Li3N, and Eu2O3 as the safety raw materials under atmospheric pressure for the first time, which shows red emission peaking at 638 nm with full width at half maximum (FWHM) of 62 nm under blue light irradiation and becomes the desired red phosphor to realize the balance between luminous efficacy and high CRI in white LEDs. The morphology, structure, luminescence properties, thermal quenching behavior, and chromaticity stability of the Li2Ca2Mg2Si2N6:Eu2+ phosphor are investigated in detail. Concentration quenching occurs when the Eu2+ content exceeds 1.0 mol%, whereas high‐temperature photoluminescent measurements show a 32% drop from the room‐temperature efficiency at 423 K. In view of the excellent luminescence performances of Li2Ca2Mg2Si2N6:Eu2+ phosphor, a white LEDs with CRI of 91 as a proof‐of‐concept experiment was fabricated by coating the title phosphor with Y3Al5O12:Ce3+ on a blue LED chip. In addition, the potential application of the title phosphor in plant growth LED device was also demonstrated. All the results indicate that Li2Ca2Mg2Si2N6:Eu2+ is a promising red‐emitting phosphor for blue LED‐based high CRI white LEDs and plant growth lighting sources.

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Держатели документа:
South China Agr Univ, Coll Hort, Guangzhou, Guangdong, Peoples R China.
South China Agr Univ, Coll Mat & Energy, Guangdong Prov Engn Technol Res Ctr Opt Agr, Guangzhou 510642, Guangdong, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk, Russia.

Доп.точки доступа:
Yang, Xiang; Zhang, Y.u.; Zhang, Xuejie; Chen, Jian; Huang, Haisen; Wang, Dongsheng; Chai, Xirong; Xie, Gening; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, Haoran; Liu, Yingliang; Lei, Bingfu
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    Multiple substitution strategies toward tunable luminescence in Lu2MgAl4SiO12:Eu2+ phosphors / Z. Ming, J. Qiao, M. S. Molokeev [et al.] // Inorg. Chem. - 2020. - Vol. 59, Is. 2. - P. 1405-1413, DOI 10.1021/acs.inorgchem.9b03142. - Cited References: 31. - This research is supported by the National Natural Science Foundation of China (Grants 51972118, 51722202, and 51572023), Natural Science Foundations of Beijing (Grant 2172036), and Fundamental Research Funds for the Central Universities (Grant FRF-TP-18-002C1) . - ISSN 0020-1669. - ISSN 1520-510X
   Перевод заглавия: Стратегии множественного замещения для перестраиваемой люминесценции в люминофорах Lu2MgAl4SiO12:Eu2+
Рубрики:
Physical and chemical processes
   Phosphors
   Luminescence
   Cations
   Ions
Аннотация: The equivalent or heterovalent substitution strategy is an efficient way to stimulate photoluminescence tuning or to optimize the luminescence performances of phosphor materials. Garnet-type compounds receive much attention as phosphor hosts because of their flexible structural frameworks. Herein, a garnet-type Lu2MgAl4SiO12:Eu2+ phosphor with broad-band blue-green emission is first explored with two-site occupation by varying the Eu2+ content. Two host-substitution approaches to controlling the luminescence behavior of Lu2MgAl4SiO12:Eu2+ phosphor are implemented. The cation substitution strategy of Ca2+ for Mg2+ achieves tunable emission from 463 to 503 nm together with broadening emission bands in Lu2Mg1–yCayAl4SiO12:Eu2+ phosphors. Moreover, chemical unit cosubstitution of [Ca2+–Ge4+] replacing [Lu3+–Al3+] results in Lu2–zCazMgAl4–zGezSiO12:Eu2+ phosphors, which induce a red shift of the emission peak of about 60 nm and a broadening in the emission spectra with increasing Ca2+ and Ge4+ concentrations. The possible photoluminescence tuning mechanism is ascribed to the coordination sphere variation in the EuO8 polyhedron depending on the changing neighboring cations. The proposed approaches on equivalent or heterovalent substitution can contribute to the development of Eu2+-activated garnet-type phosphors with regulation of the luminescence performance and further initiate research discovering new phosphors for white-light-emitting diodes.

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Держатели документа:
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China

Доп.точки доступа:
Ming, Zhiqiang; Qiao, Jianwei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Swart, Hendrik C.; Xia, Zhiguo
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    Competitive site occupation toward improved quantum efficiency of SrLaScO4:Eu red phosphors for warm white LEDs / Z. Y. Yang, G. C. Liu, Y. F. Zhao [et al.] // Adv. Opt. Mater. - 2022. - Vol. 10. Is. 6. - Ст. 2102373, DOI 10.1002/adom.202102373. - Cited References: 42. - This research was supported by the International Cooperation Project of National Key Research and Development Program of China (Program No. 2021YFE0105700), National Natural Science Foundation of China (Grant Nos. 51972118 and 51961145101), Guangzhou Science & Technology Project (Project No. 202007020005), the State Key Laboratory of Luminescent Materials and Devices (Grant No. Skllmd-2021-09), China Postdoctoral Science Foundation (Grant No. 2021M691053), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (Program No. 2017BT01X137). This work was also funded by RFBR according to the research Project No. 19-52-80003 and the NRF International: SA/China Joint Research Programme 2021 - CHIN2002265 06921 UID 132785 . - ISSN 2195-1071
   Перевод заглавия: Конкурентное заселение позиций для повышения квантовой эффективности красных люминофоров SrLaScO4:Eu для тепло-белых светодиодов

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
LUMINESCENCE
   EUROPIUM
   BLUE
   EU2+
   STABILIZATION
   EPR
Кл.слова (ненормированные):
light-emitting diodes -- photoluminescence -- red emission
Аннотация: The discovery of Eu2+-doped high-efficiency red phosphors remains a vital challenge for white light-emitting diode (WLED) applications. It is therefore urgent to find effective strategies managing the oxidation state to help reduce Eu3+ to Eu2+ and accordingly increase the photoluminescence quantum yield (PLQY). Herein, a new red-emitting SrLaScO4:Eu phosphor is designed, and the PLQY is enhanced from 13% to 67% under 450 nm excitation by employing (NH4)2SO4-assisted sintering. Combined structural analysis, optical spectroscopy, and theoretical calculation reveal that predominant Eu2+ prefers to occupy the Sr2+ sites in the SrLaScO4 enabling red emission, and a competitive site occupation of Eu3+ in La3+ can be restrained, and the reduction mechanism of Eu3+ to Eu2+ originating from the (NH4)2SO4 addition is analyzed. The fabricated WLED device using red-emitting SrLaScO4:Eu and yellow-emitting Y3(Al,Ga)5O12:Ce3+ exhibits a high color-rendering index of 86.7 at a low correlated color temperature of 4005 K. This work provides a feasible reduction strategy for guiding the development of high-efficiency Eu2+-doped red phosphor for WLED applications.

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Держатели документа:
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.
City Univ Hong Kong, Dept Chem, Kowloon, Hong Kong 999077, Peoples R China.
KSC SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.
Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa.
South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510641, Peoples R China.

Доп.точки доступа:
Yang, Zhiyu; Liu, Gaochao; Zhao, Yifei; Zhou, Yayun; Qiao, Jianwei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Swart, Hendrik C.; Xia, Zhiguo; International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51972118, 51961145101]; Guangzhou Science & Technology Project [202007020005]; State Key Laboratory of Luminescent Materials and Devices [Skllmd-2021-09]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2021M691053]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]; NRF International: SA/China Joint Research Programme 2021 [CHIN2002265 06921 UID 132785]
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    Phase formation upon crystallization of SrO center dot 2B(2)O(3) glasses / A. I. Zaitsev [et al.] // Crystallogr. Rep. - 2011. - Vol. 56, Is. 1. - P44-51, DOI 10.1134/S1063774511010263. - Cited Reference Count: 21 . - JAN. - ISSN 1063-7745
Рубрики:
STRONTIUM TETRABORATE
   LUMINESCENCE
   SRB4O7
   GROWTH
Кл.слова (ненормированные):
crystalline form -- crystalline formation -- crystalline phasis -- glass surfaces -- phase formations -- thermal analysis -- thermal stability -- crystalline materials -- crystallization -- glass -- thermoanalysis -- thermodynamic stability -- metastable phases
Аннотация: The crystallization of SrO center dot 2B(2)O(3) glasses has been studied. Four different crystalline formations were found to form simultaneously and independently on the glass surface: stable alpha-SrB4O7 crystals and metastable crystalline forms (beta-SrB4O7, Sr4B14O25, and spherulites (presumably, mixtures of crystalline phases)). The ranges of thermal stability of the newly formed metastable phases have been established using thermal analysis.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Zaitsev, A. I.; Зайцев, Александр Иванович; Zamkov, A. V.; Замков, Анатолий Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Cherepakhin, A. V.; Черепахин, Александр Владимирович; Koroleva, N. S.
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    The trigonal polymorph of strontium tetraborate, beta-SrB4O7 [Text] / A. D. Vasiliev, A. V. Cherepakhin, A. I. Zaitsev // Acta Crystallogr. Sect. E.-Struct Rep. Online. - 2010. - Vol. 66, Part 6. - PI48-U132, DOI 10.1107/S1600536810019069. - Cited Reference Count: 22. - Гранты: We thank the State Program for Support of Leading Scientific Schools (grant LS-4645.2010.2.). - Финансирующая организация: Leading Scientific Schools [LS-4645.2010.2] . - JUN. - ISSN 1600-5368
Рубрики:
CRYSTAL-STRUCTURE
   SRB4O7
   LUMINESCENCE
   MODEL
Кл.слова (ненормированные):
Tetra
Аннотация: The asymmetric unit of the title compound, beta-SrB4O7, contains five Sr atoms (three located on a threefold rotation axis), twelve B and 21 O atoms. The structure is made up from BO3 triangles and BO4 tetrahedra in a 1:1 ratio. Pairs of BO3 triangles are linked to BO4 tetrahedra via common corners, forming chains. These chains are further linked to adjacent chains through corner-sharing, leading to a three-dimensional framework with channels running parallel to [001]. The Sr2+ ions reside in the channels and exhibit strongly distorted polyhedra The density of the beta-polymorph is considerably lower than that of beta-SrB4O7, which is constructed solely from BO4 tetrahedra.

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Держатели документа:
Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Vasiliev, Alexander D.; Cherepakhin, Alexander V.; Zaitsev, Alexander I.
}
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10.

    Monoclinic SmAl3(BO3)4: synthesis, structural and spectroscopic properties / A. S. Oreshonkov, N. P. Shestakov, M. S. Molokeev [et al.] // Acta Crystallogr. B. - 2020. - Vol. 76. - P. 654-660, DOI 10.1107/S2052520620008781. - Cited References: 38. - Funding for this research was provided by: Russian Foundation for Basic Research (grant Nos. 18-03-00750, 18-05-00682 and 18-32-20011 to AO) . - ISSN 2052-5206
   Перевод заглавия: Моноклинный SmAl3(BO3)4: синтез, структура и спектроскопические свойства

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
Optical-properties
   Luminescence
   Spectra
   Crystals
   Sm
Кл.слова (ненормированные):
IR spectroscopy -- monoclinic structure -- luminescence -- Raman spectroscopy -- X-ray diffraction -- crystal structure
Аннотация: Single crystals of SmAl3(BO3)4 were synthesized by the group growth on seeds method. The crystal structure was solved using a single-crystal experiment and the purity of the bulk material was proved by the Rietveld method. This borate crystallizes in the monoclinic C2/c space group with unit-cell parameters a = 7.2386 (3), b = 9.3412 (5), c = 11.1013 (4) Å and β = 103.2240 (10)°. IR and Raman spectroscopic analyses confirmed the monoclinic structure of SmAl3(BO3)4. Under 532.1 nm excitation, luminescence spectra exhibit bands assignable to the transitions from 4G5/2 to 6H5/2, 6H7/2, 6H9/2 and 6H11/2. The similarity of the luminescence spectra of the trigonal and monoclinic polymorphs is explained by the minor role of Sm—O bond distortion and the primary role of rotational distortion of SmO6 octahedra. The smaller covalency of the Sm—O bond in alumoborates is deduced in comparison with galloborates. Calorimetric measurements did not reveal high-temperature structural phase transitions up to a temperature of 720 K.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Mol Spect, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sch Engn & Construct, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Sch Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Coherent Opt, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Nanotechnol Spect & Quantum Chem, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Radiospect & Spintron, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Inst Automat & Electrometry, Novosibirsk 630090, Russia.
Fed Res Ctr KSC SB RAS, Dept Mol Elect, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660074, Russia.
Tyumen State Univ, Dept Inorgan & Phys Chem, Tyumen 625003, Russia.
Ind Univ Tyumen, Dept Gen & Special Chem, Tyumen 625000, Russia.

Доп.точки доступа:
Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Shestakov, N. P.; Шестаков, Николай Петрович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович; Adichtchev, S. V.; Pugachev, A. M.; Nemtsev, I. V.; Немцев, Иван Васильевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Denisenko, Y. G.; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-03-00750, 18-05-00682, 18-32-20011]
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