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    Zero-Dimensional Organic Copper(I) Iodide Hybrid with High Anti-Water Stability for Blue-Light-Excitable Solid-State Lighting / B. Su, J. Jin, Y. Peng [et al.] // Adv. Opt. Mater. - 2022. - Vol. 10, Is. 12. - Ст. 2102619, DOI 10.1002/adom.202102619. - Cited References: 55. - This work was supported by the National Natural Science Foundation of China (Nos.: 51961145101 and 51972118), Guangzhou Science & Technology Project (202007020005), 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 . - ISSN 2195-1071
   Перевод заглавия: Нульмерный металлорганический гибрид йодида меди(I) с высокой водостойкостью для ламп, возбуждаемых синим светом
Кл.слова (ненормированные):
anti-water stability -- copper(I) iodide cluster -- light-emitting diodes -- photoluminescence -- zero-dimensional metal halides
Аннотация: The discovery of rare-earth free luminescent materials with blue-light-excitable characteristic is of great importance for solid-sate lighting applications. Herein, a Cu(I)-based 0D luminescent hybrid (1,3-dppH2)2Cu4I8∙H2O is synthesized by a facile solution method, and it shows the orange-red emission peaking at 625 nm upon 460 nm excitation. The structure-related luminescence mechanism has been elaborated by experimental and theoretical investigations. Moreover, the emission intensity remains unchanged even after continuous water treatment for 60 days due to the improved structural stability originating from intermolecular π–π interaction between organic cations. A warm white light-emitting diode (LED) device with the color rendering index of 91.4% has been fabricated by combining the 440 nm LED chip, green-emitting Lu3Al5O12:Ce3+, and (1,3-dppH2)2Cu4I8∙H2O. This work provides a new design route towards 0D cuprous halide materials and will initiate more exploration of their intrinsic luminescence mechanism.

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Держатели документа:
The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation

Доп.точки доступа:
Su, B.; Jin, J.; Peng, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yang, X.; Xia, Z.
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    Su, Binbin.
    Unveiling Mn2+ dopant states in two-dimensional halide perovskite toward highly efficient photoluminescence / B. B. Su, M. S. Molokeev, Z. G. Xia // J. Phys. Chem. Lett. - 2020. - Vol. 11, Is. 7. - P. 2510-2517, DOI 10.1021/acs.jpclett.0c00593. - Cited References: 49. - This work is supported by the National Natural Science Foundation of China (51961145101, 51972118, and 51722202), Fundamental Research Funds for the Central Universities (D2190980), the Guangdong Provincial Science & Technology Project (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 1948-7185
   Перевод заглавия: Открытие легирующих состояний Mn2 + в двумерном галоидном перовските для высокоэффективной фотолюминесценции

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Atomic, Molecular & Chemical
Рубрики:
LEAD BROMIDE PEROVSKITES
   ENERGY-TRANSFER
   EXCITON DYNAMICS
   DOPING MN2+
Аннотация: Doping is able to create novel optoelectronic properties of halide perovskites, and the involved mechanism of efficient emission is still a challenge. Herein Mn2+ substitution into 2D layered perovskites (C8H20N2)PbBr4 was investigated, demonstrating broad-band orange-red emission originating from the 4T1 → 6A1 transition of Mn2+ dopant. The photoluminescence quantum yield (PLQY) of Mn2+ emission is up to 60.8% related to the energy transfer in coupled states. We verify that an actual Mn2+ dopant as low as 0.476% reaches a high PLQY, whereas the nominal adding amount is 0.8 as the Mn2+/Pb2+ ratio. The small activation energy (∼6.72 meV) between the Mn2+ d state and the trap state accounts for this highly efficient energy transfer and photoluminescence. The proposed luminescence mechanism in Mn2+-doped 2D halide perovskites would provide unique insights into the doping design toward high-performance luminescence materials.

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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 & Technol, Guangzhou 510640, Guangdong, 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.

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo
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    Unraveling the ultrafast self-assembly and photoluminescence in zero-dimensional Mn2+-based halides with narrow-band green emissions / G. Zhou, Q. Ren, M. S. Molokeev [et al.] // ACS Appl. Electron. Mater. - 2021. - Vol. 3, Is. 9. - P. 4144-4150, DOI 10.1021/acsaelm.1c00606. - Cited References: 37. - This work is supported by the Natural Science Foundation of China (no. 21871167) and the 1331 project of Shanxi Province and funded by RFBR according to the research project no. 19-52-80003 . - ISSN 2637-6113
   Перевод заглавия: Открытие сверхбыстрой самосборки и фотолюминесценции в галогенидах на основе Mn2+ с нулевой размерностью и узкополосной зеленой эмиссией
Кл.слова (ненормированные):
zero-dimensional Mn2+-based halides -- ultrafast self-assembly -- photoluminescence -- white LEDs -- solid-state displays
Аннотация: The discovery of narrow-band luminescent materials remains an immense challenge to optimize the performance of white light-emitting diodes (LEDs). So far, the zero-dimensional (0D) Mn2+-based halides with near-unity narrow-band emissions have emerged as a class of promising phosphors in solid-state displays, but the related large-scale synthesis strategies have not been proposed and evaluated. Herein, we report an in situ synthetic process of 0D Mn2+-based halides and utilize (C20H20P)2MnBr4 as a case to investigate the photoluminescence characteristics and the structural essence of ultrafast self-assembly. The bright green emission peak at 523 nm with a full width at half maximum of 48 nm for (C20H20P)2MnBr4 is attributed to the d–d transition (4T1–6A1) of tetrahedrally coordinated [MnBr4]2– centers, and the fabricated white LED device shows a wide color gamut of 103.7% National Television System Committee (NTSC) standard. Remarkably, the experimental and theoretical results indicate that there are hydrogen bonding of C–H···Br and weak van der Waals interactions between [C20H20P]+ and [MnBr4]2–, resulting in the root for the realization of ultrafast self-assembly in 0D Mn2+-based halides. This work reveals a feasible and general synthesis method for preparing 0D Mn2+-based halides, thereby providing a possibility for their industrial application in solid-state displays.

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Держатели документа:
Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Linfen, 041004, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
State Key Lab. of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China
Coll. of Chem. and Chem. Eng., Key Lab. of Interface Sci. and Eng. in Adv. Mat., Min. of Education, Taiyuan University of Technology, Shanxi, Taiyuan, 030024, China

Доп.точки доступа:
Zhou, G.; Ren, Q.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhou, Y.; Zhang, J.; Zhang, X. -M.
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    Ultrabroadband red luminescence of Mn4+ in MgAl2O4 peaking at 651 nm / H. P. Ji, X. H. Hou, M. S. Molokeev [et al.] // Dalton Trans. - 2020. - Vol. 49, Is. 17. - P. 5711-5721, DOI 10.1039/d0dt00931h. - 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). . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Сверхширокополосная красная люминесценция Mn4+ в MgAl2O4 с максимумом на 651 нм

РУБ Chemistry, Inorganic & Nuclear
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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Держатели документа:
Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China.
Fed Reseals Ctr KSC SR RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Kyoto Univ, Grad Sch Human & Environm Studies, Kyoto 6068501, Japan.
Chongqing Univ Posts & Telecommun, CQUPT BUL Innovat Inst, Chongqing 400065, Peoples R China.
Chongqing Univ Posts & Telecommun, Coll Sci, Chongqing 400065, Peoples R China.
Univ Tartu, Inst Phys, EE-50411 Tartu, Estonia.
Dongguan Univ Technol, Sch Mat Sci & Engn, Dongguan 523808, Peoples R China.

Доп.точки доступа:
Ji, Haipeng; Hou, Xinghui; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ueda, Jumpei; Tanabe, Setsuhisa; Brik, M. G.; Zhang, Zongtao; Wang, Y.u.; Chen, Deliang
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    Ultra-broad-band-excitable Cu(I)-based organometallic halide with near-unity emission for light-emitting diode applications / J. Huang, B. Su, E. Song [et al.] // Chem. Mater. - 2021. - Vol. 33, Is. 12. - P. 4382-4389, DOI 10.1021/acs.chemmater.1c00085. - Cited References: 43. - This research was supported by the National Natural Science Foundation of China (Grant Nos. 51961145101 and 51972118), the Fundamental Research Funds for the Central Universities (D2190980), the Guangzhou Science and Technology Project (202007020005), International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). The reported study was also funded by RFBR according to research project no. 19-52-80003 . - ISSN 0897-4756
   Перевод заглавия: Металлоорганический галогенид на основе Cu (I) со сверхширокополосным возбуждением и излучением с квантовым выходом близким к единице для применения в светодиодах
Кл.слова (ненормированные):
Crown ethers -- Hybrid materials -- Light -- Luminescence -- Metal halide lamps -- Metal halides -- Organic light emitting diodes (OLED) -- Organometallics -- Sodium compounds -- Application prospect -- Excitation characteristics -- Green emission bands -- High color rendering index -- Luminescence mechanisms -- Luminescent material -- Photoluminescence quantum yields -- White light emitting diodes -- Copper compounds
Аннотация: Low-dimensional hybrid metal halides demonstrate broad-band emission and high photoluminescence quantum yield (PLQY) acting as excellent candidates for a new generation of luminescent materials in lighting fields. However, most luminescent metal halides can only be excited by ultraviolet radiation, and the discovery of high-efficient emitters with broad-band excitation characteristics, especially upon efficient blue light irradiation, is a challenge. Herein, a zero-dimensional (0D) Cu(I)-based organometallic halide (18-crown-6)2Na2(H2O)3Cu4I6 (CNCI) was prepared with a green emission band centered at 536 nm and a near-unity PLQY (91.8%) upon excitation of 450 nm. Importantly, the ultrabroad excitation band covering a 300-500 nm range was observed in CNCI, and the luminescence mechanism has been discussed in detail. A white light-emitting diode (WLED) was fabricated with high luminous efficiency of 156 lm/W and a high color rendering index of 89.6. This work provides guidance for designing high-performance luminescent metal halides with suitable excitation characteristics and also promotes the application prospects of such materials in WLED fields.

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Держатели документа:
The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation

Доп.точки доступа:
Huang, J.; Su, B.; Song, E.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.
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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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    Two-dimensional-layered perovskite ALaTa2O7:Bi3+ (A = K and Na) phosphors with versatile structures and tunable photoluminescence / G. J. Zhou [et al.] // ACS Appl. Mater. Interfaces. - 2018. - Vol. 10, Is. 29. - P. 24648-24655, DOI 10.1021/acsami.8b08129. - Cited References: 48. - The authors acknowledge the support from the National Natural Science Foundation of China (Nos. 51722202, 91622125, and 51572023) and the Natural Science Foundations of Beijing (2172036) and RFBR (17-52-53031). . - ISSN 1944-8244
   Перевод заглавия: 2D-слоистые перовскитоподобные люминофоры ALaTa2O7:Bi3+ (A = K and Na) с разнообразными структурами и управляемой люминесценцией.

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
GENERALIZED GRADIENT APPROXIMATION
YELLOW-EMITTING PHOSPHOR
Кл.слова (ненормированные):
2D-layered perovskite -- Bi3+ emission -- ion exchange -- photoluminescence tuning -- white light LEDs
Аннотация: Topological chemical reaction methods are indispensable for fabricating new materials or optimizing their functional properties, which is particularly important for two-dimensional (2D)-layered compounds with versatile structures. Herein, we demonstrate a low-temperature (∼350 °C) ion exchange approach to prefabricate metastable phosphors ALa1–xTa2O7:xBi3+ (A = K and Na) with RbLa1–xTa2O7:xBi3+ serving as precursors. The as-prepared ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) share the same Dion–Jacobson type 2D-layered perovskite phase, and photoluminescence analyses show that ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) phosphors exhibit broad emission bands peaking at 540, 550, and 510 nm, respectively, which are attributed to the nonradiative transition of Bi3+ from excited state 3P1 or 3P0 to ground state 1S0. The various Bi3+ local environments at the crystallographic sites enable the different distributions of emission and excitation spectra, and the photoluminescence tuning of ALa0.98Ta2O7:0.02 Bi3+ (A = Rb, K, and Na) phosphors are realized through alkali metal ion exchange. Notably, the combination of superior trivalent bismuth emission and low-temperature ion exchange synthesis leads to a novel yellow-emitting K(La0.98Bi0.02)Ta2O7 phosphor which is successfully applied in a white LED device based on a commercially available 365 nm LED chip. Our realizable cases of this low-temperature ion exchange strategy could promote exploration into metastable phosphors with intriguing properties.

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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.
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
SB RAS, KSC, Fed Res Ctr, 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.

Доп.точки доступа:
Zhou, Guojun; Jiang, Xingxing; Zhao, Jing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, Zheshuai; Liu, Quanlin; Xia, Zhiguo
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    Two organic-inorganic manganese(II) halide hybrids containing protonated N,N’-dialkylthioureas with efficient green-emission / N. N. Golovnev, M. A. Gerasimova, I. A. Ostapenko [et al.] // J. Mol. Struct. - 2023. - Vol. 1277. - Ст. 134851, DOI 10.1016/j.molstruc.2022.134851. - Cited References: 42. - The reported study was funded by RFBR according to the research project № 19-52-80003. X-ray data from single crystals and powders were obtained with the analytical equipment of Krasnoyarsk Center of collective use of SB RAS . - ISSN 0022-2860
   Перевод заглавия: Два металорганических галогенида марганца(II), содержащие протонированные N,N'-диалкилтиомочевины с эффективным зеленым излучением
Кл.слова (ненормированные):
Zero-dimensional hybrid manganese(II) halides -- N,N′-alkylthioureas -- Synthesis -- Structure -- Photoluminescence -- Quantum yield -- X-ray diffraction
Аннотация: Luminescent (C5H13N2S)2[MnBr4] (1) and (C7H17N2S)2[MnBr4] (2) (C5H12N2S = N,N′-diethylthiourea, C7H16N2S = N,N′-diisopropylthiourea) were prepared via solvothermal method, and the structures of these compounds have been resolved using X-ray single crystal diffraction. The structures consist of electrostatically bound MnBr42− anions and organic C5H13N2S+ and C7H17N2S+ cations. The intermolecular N−H···Br and N−H···S hydrogen bonds additionally stabilize crystal structures of 1-2. Upon excitation over broadband covering the range 265 to 515 nm, these compounds show green emission peaking at 526 nm for 1 and 522 nm for 2, which is assigned to the 4T1→ 6A1 electronic transition of Mn2+ from isolated within the crystal structures MnBr42− tetrahedra. The photoluminescence quantum yield (PLQY) of powder 1 is 97 ± 7% for excitation at 440 nm and that of powder 2 is 83 ± 7% for excitation at 365 nm. The high PLQY indicates the absence of noticeable concentration quenching at shortest Mn···Mn distance of 8.11 and 8.73 Å between Mn2+ ions within the structures of 1 and 2. The high-performance photoluminescence of 0D (C5H13N2S)2[MnBr4] and (C7H17N2S)2[MnBr4] compounds demonstrated promising applications in photonics.

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Держатели документа:
Siberian Federal University, Krasnoyarsk 660041, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russia

Доп.точки доступа:
Golovnev, Nicolay N.; Gerasimova, Marina A.; Ostapenko, Ivan A.; Zolotov, Andrey O.; Molokeev, M. S.; Молокеев, Максим Сергеевич
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    Tuning of photoluminescence by cation nanosegregation in the (CaMg)x(NaSc)1-xSi2O6 solid solution / Z. Xia [et al.] // J. Am. Chem. Soc. - 2016. - Vol. 138, Is. 4. - P. 1158-1161, DOI 10.1021/jacs.5b12788. - Cited References: 23. - Work performed by Z.X. and Q.L. was supported by the National Natural Science Foundation of China (51272242 and 51572023), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), and the Beijing Nova Program (Z131103000413047). Work performed by G.L., J.W., Z.M., M.B., and D.J.M. at Argonne National Laboratory was supported by the Office of Basic Energy Sciences of the U.S. Department of Energy (DOE) through Grant DE-AC02-06CH11357 for research on heavy elements chemistry and materials sciences. TEM was accomplished in part at the Center for Nanoscale Materials, a DOE Office of Science User Facility under Contract DE-AC02-06CH11357. Sector 20 operations at APS are supported by DOE and the Canadian Light Source, with additional support from the University of Washington. G.L. acknowledges travel support from the CAS/SAFEA International Partnership Program for Creative Research Teams. K.R.P. gratefully acknowledges support from the National Science Foundation (DMR-1307698). . - ISSN 0002-7863
   Перевод заглавия: Управление люминесценцией за счет наносегрегации катионов в твердом растворе (CaMg)x(NaSc)1-xSi2O6

РУБ Chemistry, Multidisciplinary
Рубрики:
SPINODAL DECOMPOSITION
   ENERGY-TRANSFER
   EXSOLUTION
   CLINOPYROXEN
   NANOCRYSTALS
   SEGREGATION
   MECHANISMS
   PYROXENESS
   JERVISITE
   PHOSPHORS
Аннотация: Controlled photoluminescence tuning is important for the optimization and modification of phosphor materials. Herein we report an isostructural solid solution of (CaMg)x(NaSc)1-xSi2O6 (0 < x < 1) in which cation nanosegregation leads to the presence of two dilute Eu2+ centers. The distinct nanodomains of isostructural (CaMg)Si2O6 and (NaSc)Si2O6 contain a proportional number of Eu2+ ions with unique, independent spectroscopic signatures. Density functional theory calculations provided a theoretical understanding of the nanosegregation and indicated that the homogeneous solid solution is energetically unstable. It is shown that nanosegregation allows predictive control of color rendering and therefore provides a new method of phosphor development. © 2016 American Chemical Society.

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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
Chemical Sciences and Engineering Division, Argonne, IL, United States
Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne, IL, United States
Nuclear Engineering Division, Argonne, IL, United States
X-ray Science Division, Argonne National Laboratory, Argonne, IL, United States
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, United States

Доп.точки доступа:
Xia, Z.; Liu, G.; Wen, J.; Mei, Z.; Balasubramanian, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Peng, L.; Gu, L.; Miller, D. J.; Liu, Q.; Poeppelmeier, K. R.
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10.

    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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