1
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El-Shahat M, Abdelhameed RM. Urea production via photocatalytic coupling of mixed gases (CO 2/NH 3) using Mo(MnO 4) 5 supported on Ce-BTC as nano-composite catalyst. Sci Rep 2024; 14:15608. [PMID: 38971874 PMCID: PMC11227513 DOI: 10.1038/s41598-024-65363-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 06/19/2024] [Indexed: 07/08/2024] Open
Abstract
Urea used in fertilization and feed supplement, as well as a starting material for the manufacture of plastics and drugs. Urea is most commonly produced by reacting carbon dioxide with ammonia at high temperature. Photocatalysis has gained attention as a sustainable pathway for performing urea. This work focus on designing very active photocatalysts based on cerium organic framework (Ce-BTC) doped with metal oxide nanoparticles (molybdenum permanganate, Mo(MnO4)5) for production of urea from coupling of ammonia with carbon dioxide. The prepared materials were characterized using different spectral analysis and the morphology was analysed using microscopic data. The effect of catalyst loading on the production rate of urea was investigated and the obtained results showed speed rate of urea production with high production yield at low temperature. The recyclability tests confirmed the sustainability of the prepared photocatlysts (Mo(MnO4)5@Ce-BTC) which supported the beneficial of the photocatalysis process in urea production.
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Affiliation(s)
- Mahmoud El-Shahat
- Photochemistry Department, Chemical Industries Research Institute, National Research Centre, 33 El Buhouth St., Dokki, Giza, 12622, Egypt.
| | - Reda M Abdelhameed
- Applied Organic Chemistry Department, Chemical Industries Research Institute, National Research Centre, 33 El Buhouth St., Dokki, Giza, 12622, Egypt.
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2
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Kitagawa Y, Ueda J, Tanabe S. A brief review of characteristic luminescence properties of Eu 3+ in mixed-anion compounds. Dalton Trans 2024; 53:8069-8092. [PMID: 38686957 DOI: 10.1039/d4dt00191e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Trivalent europium (Eu3+) ions show red luminescence with sharp spectral lines owing to the intraconfigurational 4f-4f transitions. Because of their characteristic luminescence properties, various Eu3+-doped inorganic compounds have been developed to meet the demands of optoelectronic devices. Regardless of shielding by the outer 5s and 5p orbitals, the properties of the Eu3+:4f-4f transition depend on the local environment, such as the shapes of the coordination polyhedra, site symmetry, nephelauxetic effects, crystal field effects, and bonding character. Mixed-anion coordination, where multiple types of anions surround a single Eu3+ ion, can directly affect the optical properties of Eu3+. We review the luminescence properties of Eu3+ ions in mixed-anion compounds of the oxynitride YSiO2N and oxyhalides YOX (X = Cl or Br). Oxynitride and oxyhalide coordination results in characteristic transition probabilities and branching ratios of the 5D0 → 7F0-6 transitions due to distorted structural environments and red-shifted charge transfer excitation bands due to an upward shift of the valence band. The expected and experimentally observed features of Eu3+ luminescence in mixed-anion compounds are outlined based on band and Judd-Ofelt theories. Future applications of the intense red luminescence at ∼620 nm under near-ultraviolet light illumination in Eu3+-doped mixed-anion compounds are introduced, and material design guidelines for new functional Eu3+-doped phosphors are presented.
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Affiliation(s)
- Yuuki Kitagawa
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 563-8577 Osaka, Japan.
- Graduate School of Human and Environmental Studies, Kyoto University, 606-8501 Kyoto, Japan
| | - Jumpei Ueda
- Graduate School of Human and Environmental Studies, Kyoto University, 606-8501 Kyoto, Japan
- Graduate School of Advanced Science and Technology, Japan Advanced Industrial Science and Technology, Nohmi, 923-1292 Ishikawa, Japan
| | - Setsuhisa Tanabe
- Graduate School of Human and Environmental Studies, Kyoto University, 606-8501 Kyoto, Japan
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3
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Kang X, Csetenyi L, Gadd GM. Fungal biorecovery of cerium as oxalate and carbonate biominerals. Fungal Biol 2023; 127:1187-1197. [PMID: 37495308 DOI: 10.1016/j.funbio.2022.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 07/13/2022] [Accepted: 07/18/2022] [Indexed: 11/30/2022]
Abstract
Cerium is the most sought-after rare earth element (REE) for application in high-tech electronic devices and versatile nanomaterials. In this research, biomass-free spent culture media of Aspergillus niger and Neurospora crassa containing precipitant ligands (oxalate, carbonate) were investigated for their potential application in biorecovery of Ce from solution. Precipitation occurred after Ce3+ was mixed with biomass-free spent culture media and >99% Ce was recovered from media of both organisms. SEM showed that biogenic crystals with distinctive morphologies were formed in the biomass-free spent medium of A. niger. Irregularly-shaped nanoparticles with varying sizes ranging from 0.5 to 2 μm and amorphous biominerals were formed after mixing the carbonate-laden N. crassa supernatant, resulting from ureolysis of supplied urea, with Ce3+. Both biominerals contained Ce as the sole metal, and X-ray diffraction (XRD) and thermogravimetric analyses identified the biominerals resulting from the biomass-free A. niger and N. crassa spent media as cerium oxalate decahydrate [Ce2(C2O4)3·10H2O] and cerium carbonate [Ce2(CO3)3·8H2O], respectively. Thermal decomposition experiments showed that the biogenic Ce oxalates and carbonates could be subsequently transformed into ceria (CeO2). FTIR confirmed that both amorphous and nanoscale Ce carbonates contained carbonate (CO32-) groups. FTIR-multivariate analysis could classify the biominerals into three groups according to different Ce concentrations and showed that Ce carbonate biominerals of higher purity were produced when precipitated at higher Ce3+ concentrations. This work provides new understanding of fungal biotransformations of soluble REE species and their biorecovery using biomass-free fungal culture systems and indicates the potential of using recovered REE as precursors for the biosynthesis of novel nanomaterials.
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Affiliation(s)
- Xia Kang
- Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, Scotland, United Kingdom; Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences and Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, Sichuan Province, China
| | - Laszlo Csetenyi
- Concrete Technology Group, Department of Civil Engineering, University of Dundee, Dundee, DD1 4HN, Scotland, United Kingdom
| | - Geoffrey Michael Gadd
- Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, Scotland, United Kingdom; State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Oil and Gas Pollution Control, College of Chemical Engineering and Environment, China University of Petroleum, 18 Fuxue Road, Changping District, Beijing, 102249, China.
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4
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Gil-de-Cos G, Torres M, González-Silgo C, Soler-Carracedo K, Martín I, Rivera-López F, Rodríguez-Rodríguez S. Unexpected wide tuning of ferroelectric properties by varying the Er concentration in La2-xErx(MoO4)3 (x = 0.75, 1, 1.25) solid solutions. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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5
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Electronic Structure Calculation of Cr3+ and Fe3+ in Phosphor Host Materials Based on Relaxed Structures by Molecular Dynamics Simulation. TECHNOLOGIES 2022. [DOI: 10.3390/technologies10030056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The electronic structures of the luminescent center ions Cr3+ and Fe3+ in the deep red phosphors LiAl5O8:Cr3+, α-Al2O3:Cr3+, and γ-LiAlO2:Fe3+ were calculated by the DV-Xα method, in which the local distortion induced by the replacement of Al3+ sites in the host crystals by the luminescent center ions was reproduced by classical molecular dynamics (MD) simulation. The MD simulations based on classical dynamics allowed for the handling of more than 1000 atoms for the lattice relaxation calculations, which was advantageous to simulate situations in which a small number of foreign atoms (ions) were dispersed in the host lattice as in phosphors, even when typical periodic boundary conditions were applied. The relaxed lattices obtained after MD indicated that the coordination polyhedra around Cr3+ and Fe3+ expanded in accordance with the size difference between the luminescent center ions and Al3+ in the host crystals. The overall profiles of the partial density of states (p-DOSs) of the isolated Cr3+ and Fe3+ 3d orbitals were not significantly affected by the lattice relaxation, whereas the widths of the energy splitting of the 3d orbitals were reduced. The electronic structure calculations for Fe–Fe pairs in γ-LiAlO2 showed that the antiferromagnetic interactions with antiparallel electron spins between the Fe3+ ions were preferred, especially when the Fe–Fe pair was on the first-nearest neighboring cation sites.
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Kitagawa Y, Ueda J, Xu J, Nakanishi T, Takeda T, Hirosaki N, Tanabe S. Deep-red to near-infrared luminescence from Eu 2+-trapped exciton states in YSiO 2N. Phys Chem Chem Phys 2022; 24:4348-4357. [PMID: 35108722 DOI: 10.1039/d1cp05242j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The valence state of Eu ions doped in inorganic compounds is easily influenced by the synthesizing conditions. In this study, X-ray absorption spectroscopy revealed that almost half of Eu ions incorporated in the YSiO2N host were reduced into the divalent state through the sintering process at 1600 °C under a N2 gas atmosphere without any annealing processes. The prepared Eu2+/3+-doped YSiO2N sample showed anomalous deep-red to near-infrared luminescence below 300 K under violet light illumination, whose luminescent properties are discussed through detailed spectroscopic analyses. In the photoluminescence spectra at 4 K, the broad luminescence band ranging from 550 to 1100 nm with a large Stokes shift of 5677 cm-1 was observed, assigned to the recombination emission related to the Eu2+-trapped exciton state. The temperature dependence of luminescence lifetime suggests that the thermal quenching of Eu2+-trapped exciton luminescence takes place through complicated processes in addition to thermal ionization. The energy diagrams based on the spectroscopic results indicate that Eu2+-trapped exciton luminescence in the YSiO2N:Eu2+/3+ sample was observed because all the Eu2+: 5d excited levels are degenerated with the host conduction band, and the relatively stable Eu2+-trapped exciton state in the Y3+ sites is formed just below the conduction band bottom. A comprehensive discussion on the deep-red to near-infrared luminescence in the YSiO2N host could give new insights into the mechanism of Eu2+-trapped exciton luminescence in Y3+ sites, which has potential in near-infrared emitting devices.
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Affiliation(s)
- Yuuki Kitagawa
- Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan.
| | - Jumpei Ueda
- Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan.
| | - Jian Xu
- International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Takayuki Nakanishi
- Luminescent Materials Group, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Takashi Takeda
- Luminescent Materials Group, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Naoto Hirosaki
- Luminescent Materials Group, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Setsuhisa Tanabe
- Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan.
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7
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Oishi M, Shiomi S, Ohara K, Fujishiro F, Kai Y, Shih SJ, Moriga T, Chichibu SF, Takatori A, Kojima K. Enhanced quantum efficiency of a self-organized silica mixed red phosphor CaAlSiN3:Eu. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.122968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Kang X, Csetenyi L, Gao X, Gadd GM. Solubilization of struvite and biorecovery of cerium by Aspergillus niger. Appl Microbiol Biotechnol 2022; 106:821-833. [PMID: 34981166 PMCID: PMC8763747 DOI: 10.1007/s00253-021-11721-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 11/25/2021] [Accepted: 11/26/2021] [Indexed: 11/04/2022]
Abstract
Cerium has many modern applications such as in renewable energies and the biosynthesis of nanomaterials. In this research, natural struvite was solubilized by Aspergillus niger and the biomass-free struvite leachate was investigated for its ability to recover cerium. It was shown that struvite was completed solubilized following 2 weeks of fungal growth, which released inorganic phosphate (Pi) from the mineral by the production of oxalic acid. Scanning electron microscopy (SEM) showed that crystals with distinctive morphologies were formed in the natural struvite leachate after mixing with Ce3+. Energy-dispersive X-ray analysis (EDXA), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) confirmed the formation of cerium phosphate hydrate [Ce(PO4)·H2O] at lower Ce concentrations and a mixture of phosphate and cerium oxalate decahydrate [Ce2(C2O4)3·10H2O] at higher Ce concentrations. The formation of these biogenic Ce minerals leads to the removal of > 99% Ce from solution. Thermal decomposition experiments showed that the biogenic Ce phosphates could be transformed into a mixture of CePO4 and CeO2 (cerianite) after heat treatment at 1000 °C. These results provide a new perspective of the fungal biotransformation of soluble REE species using struvite leachate, and also indicate the potential of using the recovered REE as biomaterial precursors with possible applications in the biosynthesis of novel nanomaterials, elemental recycling and biorecovery. KEY POINTS: • Cerium was recovered using a struvite leachate produced by A. niger. • Oxalic acid played a major role in struvite solubilization and Ce phosphate biorecovery. • Resulting nanoscale mineral products could serve as a precursor for Ce oxide synthesis.
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Affiliation(s)
- Xia Kang
- Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK, Scotland
- Key Laboratory of Environmental and Applied Microbiology, CAS; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Laszlo Csetenyi
- Concrete Technology Group, Department of Civil Engineering, University of Dundee, Dundee,, DD1 4HN, UK, Scotland
| | - Xiang Gao
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, Scotland, UK
| | - Geoffrey Michael Gadd
- Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK, Scotland.
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Oil and Gas Pollution Control, College of Chemical Engineering and Environment, China University of Petroleum, 18 Fuxue Road, Changping District, Beijing, 102249, China.
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9
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Zhang Q, Pratt EC, Tamura R, Ogirala A, Hsu C, Farahmand N, O’Brien S, Grimm J. Ultrasmall Downconverting Nanoparticle for Enhanced Cerenkov Imaging. NANO LETTERS 2021; 21:4217-4224. [PMID: 33950695 PMCID: PMC8879088 DOI: 10.1021/acs.nanolett.1c00049] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cerenkov imaging provides an opportunity to expand the application of approved radiotracers and therapeutic agents by utilizing them for optical approaches, which opens new avenues for nuclear imaging. The dominating Cerenkov radiation is in the UV/blue region, where it is readily absorbed by human tissue, reducing its utility in vivo. To solve this problem, we propose a strategy to shift Cerenkov light to the more penetrative red-light region through the use of a fluorescent down-conversion technique, based upon europium oxide nanoparticles. We synthesized square-shape ultrasmall Eu2O3 nanoparticles, functionalized with polyethylene glycol and chelate-free radiolabeled for intravenous injection into mice to visualize the lymph node and tumor. By adding trimethylamine N-oxide during the synthesis, we significantly increased the brightness of the particle and synthesized the (to-date) smallest radiolabeled europium-based nanoparticle. These features allow for the exploration of Eu2O3 nanoparticles as a preclinical cancer diagnosis platform with multimodal imaging capability.
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Affiliation(s)
- Qize Zhang
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
- Department of Chemistry and Biochemistry, The City College of New York, 1024 Marshak, 160 Convent Avenue, New York, New York 10031, USA
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, USA
| | - Edwin C. Pratt
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
- Department of Pharmacology, Weill Cornell Medical College, New York, NY 10021, USA
| | - Ryo Tamura
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Anuja Ogirala
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Charlene Hsu
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Nasim Farahmand
- Department of Chemistry and Biochemistry, The City College of New York, 1024 Marshak, 160 Convent Avenue, New York, New York 10031, USA
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, USA
| | - Stephen O’Brien
- Department of Chemistry and Biochemistry, The City College of New York, 1024 Marshak, 160 Convent Avenue, New York, New York 10031, USA
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, USA
| | - Jan Grimm
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
- Department of Pharmacology, Weill Cornell Medical College, New York, NY 10021, USA
- Department of Radiology, Weill Cornell Medical College, New York, NY 10021, USA
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10
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Ivicheva SN, Ovsyannikov NA, Lysenkov AS, Klimashin AA, Kargin YF. Sol–Gel Synthesis of Oxonitridoaluminosilicates (SiAlON). RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023620120050] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Selective CO2 capture through microporous Tb(BTC)(H2O).(DMF)1.1 MOF as an additive in novel MMMs fabricated from Matrimid® 5218. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.10.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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12
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Akhmadullin NS, Shishilov ON, Kargin YF. Sensitization effects in nitride materials doped with rare-earth metals ions. Russ Chem Bull 2020. [DOI: 10.1007/s11172-020-2841-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Kshetri YK, Kamiyama T, Torii S, Jeong SH, Kim TH, Choi H, Zhou J, Feng YP, Lee SW. Electronic structure, thermodynamic stability and high-temperature sensing properties of Er-α-SiAlON ceramics. Sci Rep 2020; 10:4952. [PMID: 32188866 PMCID: PMC7080770 DOI: 10.1038/s41598-020-61105-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 01/30/2020] [Indexed: 11/09/2022] Open
Abstract
α-SiAlON ceramics have been in use as engineering ceramics in the most arduous industrial environments such as molten metal handling, cutting tools, gas turbine engines, extrusion molds, thermocouple sheaths, protective cover for high-temperature sensors, etc., owing to their outstanding mechanical, thermal and chemical stability. Taking advantage of the intrinsic properties of α-SiAlONs, we investigate, in this paper, the possibility of using the Er-doped α-SiAlON (Er-α-SiAlON) ceramic as a high-temperature sensing material via its unique near-infrared to visible upconversion property. We first use neutron diffraction and density functional theory calculations to study the electronic structure and thermodynamic stability of Er-α-SiAlON. It is found that the interstitial doping of Er stabilizes the α-SiAlON structure via chemical bonds with O-atoms with N:O ratio of 5:2 in the seven-fold coordination sites of the Er3+ ion. Temperature-dependent upconversion emissions are then studied under 980 and 793 nm excitations over a temperature range of 298-1373 K and the fluorescence intensity ratio (FIR) technique has been employed to investigate the temperature sensing behavior. Temperature-dependent Raman behavior is also investigated. We demonstrate that using Er-α-SiAlON as a sensing material, the limit of temperature measurement via the FIR technique can be pushed well beyond 1200 K.
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Affiliation(s)
- Yuwaraj K Kshetri
- Research Center for Eco-Multifunctional Nano Materials, Sun Moon University, Chungnam, 31460, Republic of Korea.
| | - Takashi Kamiyama
- Institute of Materials Structure Science, High Energy Accelerator Research Organization J-PARC Center, KEK, 203-1, Tokai, Ibaraki, 319-1106, Japan
| | - Shuki Torii
- Institute of Materials Structure Science, High Energy Accelerator Research Organization J-PARC Center, KEK, 203-1, Tokai, Ibaraki, 319-1106, Japan
| | - Sang Hoon Jeong
- Department of Environment and Bio-Chemical Engineering, Sun Moon University, Chungnam, 31460, Republic of Korea
| | - Tae-Ho Kim
- Division of Mechanics and ICT Convergence Engineering, Sun Moon University, Chungnam, 31460, Republic of Korea
| | - Heechae Choi
- Institute of Inorganic Chemistry, University of Cologne, 50939, Cologne, Germany
| | - Jun Zhou
- Department of Physics, National University of Singapore, 2 Science Drive 3, 117551, Singapore, Singapore
| | - Yuan Ping Feng
- Department of Physics, National University of Singapore, 2 Science Drive 3, 117551, Singapore, Singapore
| | - Soo Wohn Lee
- Research Center for Eco-Multifunctional Nano Materials, Sun Moon University, Chungnam, 31460, Republic of Korea.
- Department of Environment and Bio-Chemical Engineering, Sun Moon University, Chungnam, 31460, Republic of Korea.
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14
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Hoerder GJ, Peschke S, Wurst K, Seibald M, Baumann D, Stoll I, Huppertz H. SrAl 2-xLi 2+xO 2+2xN 2-2x:Eu 2+ (0.12 ≤ x ≤ 0.66)-Tunable Luminescence in an Oxonitride Phosphor. Inorg Chem 2019; 58:12146-12151. [PMID: 31483621 DOI: 10.1021/acs.inorgchem.9b01479] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Starting from the recently published narrow band red phosphor SALON, a tunable oxonitride-phosphor can be derived by introducing disorder into the structure. To achieve this, the oxygen content of the reaction mixture is increased, thereby prohibiting the oxygen/nitrogen ordering observed in SALON. The resulting compound is isotypic to UCr4C4 and exhibits mixed oxygen/nitrogen and lithium/aluminum sites. Further variation of the oxygen/nitrogen ratio revealed that the structure remains stable over a wide range of compositions. The compound can therefore be described by the general sum formula SrAl2-xLi2+xO2+2xN2-2x with x ranging between 0.12 and 0.66. When doped with Eu2+, the title compound exhibits an intense luminescence upon excitation with blue light. The maximum of this emission varies depending on the oxygen content and can be tuned to values between 581 nm (x = 0.66) and 672 nm (x = 0.12).
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Affiliation(s)
- Gregor J Hoerder
- Institute of General, Inorganic, and Theoretical Chemistry , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
| | - Simon Peschke
- OSRAM Opto Semiconductors GmbH , Mittelstetter Weg 2 , D-86830 Schwabmünchen , Germany
| | - Klaus Wurst
- Institute of General, Inorganic, and Theoretical Chemistry , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
| | - Markus Seibald
- OSRAM Opto Semiconductors GmbH , Mittelstetter Weg 2 , D-86830 Schwabmünchen , Germany
| | - Dominik Baumann
- OSRAM Opto Semiconductors GmbH , Mittelstetter Weg 2 , D-86830 Schwabmünchen , Germany
| | - Ion Stoll
- OSRAM Opto Semiconductors GmbH , Leibnizstrasse 4 , D-93055 Regensburg , Germany
| | - Hubert Huppertz
- Institute of General, Inorganic, and Theoretical Chemistry , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
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15
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El-Shazly TS, Hassan WM, Abd El Rehim SS, Allam NK. Optical and electronic properties of niobium oxynitrides with various N/O ratios: insights from first-principles calculations. JOURNAL OF PHOTONICS FOR ENERGY 2018; 8:1. [DOI: 10.1117/1.jpe.8.026501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Affiliation(s)
| | - Walid M. Hassan
- Cairo University, Chemistry Department, Faculty of Science, Giza
| | | | - Nageh K. Allam
- The American University in Cairo, School of Sciences and Engineering, Energy Materials Laboratory, N
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16
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Wang L, Xie RJ, Suehiro T, Takeda T, Hirosaki N. Down-Conversion Nitride Materials for Solid State Lighting: Recent Advances and Perspectives. Chem Rev 2018; 118:1951-2009. [PMID: 29392943 DOI: 10.1021/acs.chemrev.7b00284] [Citation(s) in RCA: 187] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Advances in solid state white lighting technologies witness the explosive development of phosphor materials (down-conversion luminescent materials). A large amount of evidence has demonstrated the revolutionary role of the emerging nitride phosphors in producing superior white light-emitting diodes for lighting and display applications. The structural and compositional versatility together with the unique local coordination environments enable nitride materials to have compelling luminescent properties such as abundant emission colors, controllable photoluminescence spectra, high conversion efficiency, and small thermal quenching/degradation. Here, we summarize the state-of-art progress on this novel family of luminescent materials and discuss the topics of materials discovery, crystal chemistry, structure-related luminescence, temperature-dependent luminescence, and spectral tailoring. We also overview different types of nitride phosphors and their applications in solid state lighting, including general illumination, backlighting, and laser-driven lighting. Finally, the challenges and outlooks in this type of promising down-conversion materials are highlighted.
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Affiliation(s)
- Le Wang
- College of Optical and Electronic Technology, China Jiliang University , Hangzhou, Zhejiang 310018, China
| | - Rong-Jun Xie
- College of Materials, Xiamen University , Simingnan-Road 422, Xiamen 361005, China
| | - Takayuki Suehiro
- Sialon Group, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Takashi Takeda
- Sialon Group, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Naoto Hirosaki
- Sialon Group, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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17
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Sun D, Zhang L, Hao Z, Zhang X, Pan GH, Wu H, Luo Y, He S, Zhao H, Zhang J. Two Ce3+ centers induced broadband emission in Y3Si6N11:Ce3+ yellow phosphor. Dalton Trans 2018; 47:16723-16728. [DOI: 10.1039/c8dt03936d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Ce2 emission center was found in Y3Si6N11:Ce3+ and the broad emission band was successfully decomposed into Ce1 and Ce2.
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18
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19
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Chen X, Gan L, Zhang Z, Lu P, Zeng X, Zhang L, Yao H, Xu F, Zhao J. Ca-α-SiAlON:Eu Phosphors: Oxidation States, Energy Transfer, and Emission Enhancement by Incorporation-Aimed Surface Engineering. ACS APPLIED MATERIALS & INTERFACES 2017; 9:30982-30991. [PMID: 28812352 DOI: 10.1021/acsami.7b05603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ca-α-SiAlON:Eu is one of the most promising phosphors exhibiting potential applications in high power LEDs owing to its excellent thermal stability and relatively high luminescence efficiency comparable to YAG:Ce commercial phosphors. The oxidation states of Eu ions in Ca-α-SiAlON:Eu are still questionable, and furthermore it exhibits lower luminescence intensity than commercial yellow phosphors. Therefore, in the present work, the valences of Eu ions in Ca-α-SiAlON have been examined, from which a mixture of divalence and trivalence is observed. Further improvement in emission intensity involves finding a way to increase the incorporation of larger Eu ions into the Ca-α-SiAlON. Here, we observed preferred doping of Eu around phosphor grain surface and then propose a surface engineering strategy involving HF pickling of glassy surface layer, formation of Eu-rich precursors, and finally post-annealing, aiming to increase surface incorporation of Eu ions. The surface engineered samples exhibit great enhancement in emission intensity with a maximum increment by 80%.
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Affiliation(s)
- Xiangyang Chen
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
- University of Chinese Academy of Science , Beijing 100039, P. R. China
| | - Lin Gan
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science & Engineering, Hubei University , Wuhan 430062, P. R. China
| | - Zhijun Zhang
- School of Materials Science and Engineering, Shanghai University , Shanghai 200444, P. R. China
| | - Ping Lu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
| | - Xionghui Zeng
- Electron Microscope Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, P. R. China
| | - Linlin Zhang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
| | - Heliang Yao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
| | - Fangfang Xu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China
| | - Jingtai Zhao
- School of Materials Science and Engineering, Shanghai University , Shanghai 200444, P. R. China
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20
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Grieco C, Hirsekorn KF, Heitsch AT, Thomas AC, McAdon MH, Vanchura BA, Romanelli MM, Brehm LL, Leugers A, Sokolov AN, Asbury JB. Mechanisms of Energy Transfer and Enhanced Stability of Carbidonitride Phosphors for Solid-State Lighting. ACS APPLIED MATERIALS & INTERFACES 2017; 9:12547-12555. [PMID: 28319374 DOI: 10.1021/acsami.6b15323] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Phosphor-converted light emitting diodes (pcLEDs) produce white light through the use of phosphors that convert blue light emitted from the LED chip into green and red wavelengths. Understanding the mechanisms of degradation of the emission spectra and quantum yields of the phosphors used in pcLEDs is of critical importance to fully realize the potential of solid-state lighting as an energy efficient technology. Toward this end, time-resolved photoluminescence spectroscopy was used to identify the mechanistic origins of enhanced stability and luminescence efficiency that can be obtained from a series of carbidonitride red phosphors with varying degrees of substitutional carbon. The increasing substitution of carbon and oxygen in nitrogen positions of the carbidonitride phosphor (Sr2Si5N8-[(4x/3)+z]CxO3z/2:Eu2+) systematically changed the dimensions of the crystalline lattice. These structural changes caused a red shift and broadening of the emission spectra of the phosphors due to faster energy transfer from higher to lower energy emission sites. Surprisingly, in spite of broadening of the emission spectra, the quantum yield was maintained or increased with carbon substitution. Aging phosphors with lowered carbon content under conditions that accurately reflected thermal and optical stresses found in functioning pcLED packages led to spectral changes that were dependent on substitutional carbon content. Importantly, phosphors that contained optimal amounts of carbon and oxygen possessed luminescence spectra and quantum yields that did not undergo changes associated with aging and therefore provided a more stable color point for superior control of the emission properties of pcLED packages. These findings provide insights to guide continued development of phosphors for efficient and stable solid-state lighting materials and devices.
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Affiliation(s)
- Christopher Grieco
- Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Kurt F Hirsekorn
- The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Andrew T Heitsch
- The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Alan C Thomas
- The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Mark H McAdon
- The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Britt A Vanchura
- The Dow Chemical Company, Midland, Michigan 48674, United States
| | | | - Lora L Brehm
- The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Anne Leugers
- The Dow Chemical Company, Midland, Michigan 48674, United States
| | | | - John B Asbury
- Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
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21
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Ni J, Liu Q, Zhou Z, Liu G. Co-doping effect of Mn2+ on fluorescence thermostability of Ca-α-sialon:Eu2+ phosphors. RSC Adv 2017. [DOI: 10.1039/c7ra06943j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
To reveal Mn2+ influence on emission of Ca-α-sialon:Eu2+, the Mn2+ and Eu2+ co-doped phosphors were synthesized by a solid state reaction method. The produced powders show an enhanced fluorescence thermostability and the roles of Mn2+ addition have been investigated.
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Affiliation(s)
- Jia Ni
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai
- China
| | - Qian Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai
- China
| | - Zhenzhen Zhou
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai
- China
| | - Guanghui Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Sciences
- Shanghai
- China
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22
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Sakaguchi N, Yamaki F, Saito G, Kunisada Y. Estimating the dopant distribution in Ca-doped α-SiAlON: statistical HAADF-STEM analysis and large-scale atomic modeling. Microscopy (Oxf) 2016; 65:400-406. [DOI: 10.1093/jmicro/dfw020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 05/18/2016] [Indexed: 11/14/2022] Open
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23
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Wang T, Xiang Q, Xia Z, Chen J, Liu Q. Evolution of Structure and Photoluminescence by Cation Cosubstitution in Eu2+-Doped (Ca1–xLix)(Al1–xSi1+x)N3 Solid Solutions. Inorg Chem 2016; 55:2929-33. [DOI: 10.1021/acs.inorgchem.5b02845] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ting Wang
- Beijing Key Laboratory for New Energy Materials and Technologies,
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Department of Physical Chemistry, School of Metallurgical
and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Qianchuan Xiang
- Beijing Key Laboratory for New Energy Materials and Technologies,
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Zhiguo Xia
- Beijing Key Laboratory for New Energy Materials and Technologies,
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Jun Chen
- Department of Physical Chemistry, School of Metallurgical
and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Quanlin Liu
- Beijing Key Laboratory for New Energy Materials and Technologies,
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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24
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Suehiro T, Tansho M, Shimizu T. Na-α′-GeGaON Solid Solution Analogous to α′-SiAlON: Synthesis, Crystal Structure, and Potentiality as a Photocatalyst. Inorg Chem 2016; 55:2355-62. [DOI: 10.1021/acs.inorgchem.5b02751] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takayuki Suehiro
- SiAlON
Unit, Environment and Energy Materials Division, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Masataka Tansho
- High
Field NMR Group, Nano Characterization Unit, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan
| | - Tadashi Shimizu
- High
Field NMR Group, Nano Characterization Unit, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan
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25
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Sato M, Kim S, Shimomura Y, Hasegawa T, Toda K, Adachi G. Rare Earth-Doped Phosphors for White Light-Emitting Diodes. INCLUDING ACTINIDES 2016. [DOI: 10.1016/bs.hpcre.2016.03.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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26
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Gan L, Xu FF, Zeng XH, Li ZS, Mao ZY, Lu P, Zhu YC, Liu XJ, Zhang LL. Multiple doping structures of the rare-earth atoms in β-SiAlON:Ce phosphors and their effects on luminescence properties. NANOSCALE 2015; 7:11393-11400. [PMID: 26073879 DOI: 10.1039/c5nr02219c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The critical doping structures of rare-earth atoms in the promising β-SiAlON phosphors have long been argued owing to the lack of direct evidence. Here, the exact locations and coordination of the Ce rare-earth atoms in the β-SiAlON structure have been examined using an atom-resolved Cs-corrected scanning transmission electron microscope. Three different occupation sites for the Ce atoms have been directly observed: two of them are in the structural channel coordinated with six and nine N(O) atoms, respectively; the other one is the unexpected substitution site for Si(Al). The chemical valences and stabilities of the doping Ce ions at the different occupation sites have been evaluated using density functional calculations. Correlation of the different doping structures with the luminescence properties has been investigated by the aid of cathodoluminescence (CL) microanalysis, which verifies the different contribution of the interstitial trivalent Ce ions to the light emission while no luminescence is observed for the substitutional doping of quadrivalent Ce.
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Affiliation(s)
- Lin Gan
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China.
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27
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Long Q, Wang C, Ding J, Li Y, Wu Q, Wang Y. Synthesis and luminescence properties of a novel red-emitting LiSr4(BN2)3:Eu2+phosphor. Dalton Trans 2015. [DOI: 10.1039/c5dt02368h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A near-UV excited phosphor, LiSr4(BN2)3:Eu2+(LSBN:Eu2+), was synthesized using a solid-state reaction at 800 °C.
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Affiliation(s)
- Qiang Long
- Department of Materials Science
- School of Physical Science and Technology
- Lanzhou University
- Key Laboratory of Special Function Materials and Structure Design
- Ministry of Education
| | - Chuang Wang
- Department of Materials Science
- School of Physical Science and Technology
- Lanzhou University
- Key Laboratory of Special Function Materials and Structure Design
- Ministry of Education
| | - Jianyan Ding
- Department of Materials Science
- School of Physical Science and Technology
- Lanzhou University
- Key Laboratory of Special Function Materials and Structure Design
- Ministry of Education
| | - Yanyan Li
- Department of Materials Science
- School of Physical Science and Technology
- Lanzhou University
- Key Laboratory of Special Function Materials and Structure Design
- Ministry of Education
| | - Quansheng Wu
- Department of Materials Science
- School of Physical Science and Technology
- Lanzhou University
- Key Laboratory of Special Function Materials and Structure Design
- Ministry of Education
| | - Yuhua Wang
- Department of Materials Science
- School of Physical Science and Technology
- Lanzhou University
- Key Laboratory of Special Function Materials and Structure Design
- Ministry of Education
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28
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Chuang W, Shuangyu X, Xicheng W, Ge Z, Quansheng W, Yuhua W. Double substitution induced tunable photoluminescence in the Sr2Si5N8:Eu phosphor lattice. NEW J CHEM 2015. [DOI: 10.1039/c5nj00997a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The incorporation of La3+–Al3+ ion pairs into Sr1.95Eu0.05Si5N8 leads to an additional emission band with maximum at about 760 nm.
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Affiliation(s)
- Wang Chuang
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou
- China
| | - Xin Shuangyu
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou
- China
| | - Wang Xicheng
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou
- China
| | - Zhu Ge
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou
- China
| | - Wu Quansheng
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou
- China
| | - Wang Yuhua
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou
- China
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29
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Leng Z, Liu L, Li L, Gan S. Synthesis and luminescent properties of ellipsoid-like YBO3:Ln3+ (Ln=Eu, Tb). Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.09.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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30
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He X, Qiu K, Lu X, Zhao K, Jiang Z. Enhanced luminescence properties in (Sr 1−x Ba x ) 2.97 SiO 3 N 4/3 :0.03Eu 2+ oxynitride phosphor. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.08.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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31
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Tian Y. Development of phosphors with high thermal stability and efficiency for phosphor-converted LEDs. ACTA ACUST UNITED AC 2014. [DOI: 10.1186/s40539-014-0011-8] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Kang F, Peng M, Zhang Q, Qiu J. Abnormal Anti-Quenching and Controllable Multi-Transitions of Bi3+Luminescence by Temperature in a Yellow-Emitting LuVO4:Bi3+Phosphor for UV-Converted White LEDs. Chemistry 2014; 20:11522-30. [DOI: 10.1002/chem.201402081] [Citation(s) in RCA: 138] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Indexed: 11/10/2022]
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33
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MA X, ZHUANG W, GUO H, LIU R, LIU Y, HU Y, WEN X. Effect of Si–N substituting for Al–O bonds on luminescence Sr3AlO4F:Ce3+ phosphor. J RARE EARTH 2014. [DOI: 10.1016/s1002-0721(14)60084-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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34
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D'Arras L, Sassoye C, Rozes L, Sanchez C, Marrot J, Marre S, Aymonier C. Fast and continuous processing of a new sub-micronic lanthanide-based metal–organic framework. NEW J CHEM 2014. [DOI: 10.1039/c3nj01371e] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One phase – two processes – two magnitudes for synthesis time and the particle size.
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Affiliation(s)
- Loïc D'Arras
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 7574
- Chimie de la Matière Condensée de Paris
- Collège de France
| | - Capucine Sassoye
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 7574
- Chimie de la Matière Condensée de Paris
- Collège de France
| | - Laurence Rozes
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 7574
- Chimie de la Matière Condensée de Paris
- Collège de France
| | - Clément Sanchez
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 7574
- Chimie de la Matière Condensée de Paris
- Collège de France
| | - Jérôme Marrot
- Institut Lavoisier
- UMR CNRS 8180
- Université de Versailles Saint-Quentin-en-Yvelines
- 78035 Versailles, France
| | - Samuel Marre
- CNRS
- Univ. Bordeaux
- ICMCB, UPR9048
- F-33600 Pessac, France
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35
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Huang CH, Liu WR, Chan TS, Lai YT. Orangish-yellow-emitting Ca3Si2O7:Eu2+ phosphor for application in blue-light based warm-white LEDs. Dalton Trans 2014; 43:7917-23. [DOI: 10.1039/c4dt00076e] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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A novel yellow-emitting SrAlSi4N7:Ce3+ phosphor for solid state lighting: Synthesis, electronic structure and photoluminescence properties. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.09.040] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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37
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Dierre B, Takeda T, Sekiguchi T, Suehiro T, Takahashi K, Yamamoto Y, Xie RJ, Hirosaki N. Local analysis of Eu 2+ emission in CaAlSiN 3. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2013; 14:064201. [PMID: 27877619 PMCID: PMC5090307 DOI: 10.1088/1468-6996/14/6/064201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 10/10/2013] [Indexed: 06/06/2023]
Abstract
We have investigated the local luminescence properties of Eu-doped CaAlSiN3 by using low-energy electron beam (e-beam) techniques. The particles yield broad emission centered at 655 nm with a shoulder at higher wavelength under light excitation, and a broad band around 643 nm with a tail at 540 nm under e-beam excitation. Using cathodoluminescence (CL) in a scanning electron microscope (SEM), we have observed small and large particles, which, although with different compositions, exhibit Eu2+-related emissions at 645 and 635 nm, respectively. Local CL measurements reveal that the Eu2+ emission may actually consist of several bands. In addition to the red broad band, regularly spaced sharp peaks have been occasionally observed. These luminescence variations may originate from a variation in the composition inside CaAlSiN3.
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Affiliation(s)
- Benjamin Dierre
- ICYS-MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Takashi Takeda
- Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Takashi Sekiguchi
- Nano Device Characterization Group, MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
- Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-0003, Japan
| | - Takayuki Suehiro
- Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Kohsei Takahashi
- Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
- Nano Device Characterization Group, MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
- Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-0003, Japan
| | - Yoshinobu Yamamoto
- Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Rong-Jun Xie
- Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Naoto Hirosaki
- Sialon Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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38
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George NC, Birkel A, Brgoch J, Hong BC, Mikhailovsky AA, Page K, Llobet A, Seshadri R. Average and Local Structural Origins of the Optical Properties of the Nitride Phosphor La3–xCexSi6N11 (0 < x ≤ 3). Inorg Chem 2013; 52:13730-41. [DOI: 10.1021/ic402318k] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nathan C. George
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa
Barbara, California 93106, United States
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Alexander Birkel
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa
Barbara, California 93106, United States
| | - Jakoah Brgoch
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa
Barbara, California 93106, United States
| | - Byung-Chul Hong
- Mitsubishi Chemical Corporation, Yokohama, Kanagawa 227-8502, Japan
| | - Alexander A. Mikhailovsky
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Katharine Page
- Lujan Neutron
Scattering Center, Los Alamos National Laboratory, New Mexico 87545 United States
| | - Anna Llobet
- Lujan Neutron
Scattering Center, Los Alamos National Laboratory, New Mexico 87545 United States
| | - Ram Seshadri
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa
Barbara, California 93106, United States
- Materials
Department and Materials Research Laboratory, University of California, Santa
Barbara, California 93106, United States
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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39
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Žukauskas A, Vaicekauskas R, Vitta P, Zabiliūtė A, Petrulis A, Shur M. Color rendition engineering of phosphor-converted light-emitting diodes. OPTICS EXPRESS 2013; 21:26642-26656. [PMID: 24216885 DOI: 10.1364/oe.21.026642] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We present an approach to the optimization of the trichromatic spectral power distributions (SPDs) of phosphor-converted (p-c) light-emitting diodes (LEDs) in respect of each of four different color rendition properties (high color fidelity, color saturating, color dulling, and color preference). The approach is based on selecting a model family of Eu2+ phosphors and finding the optimal peak wavelengths of the phosphor bands as functions of the luminous efficacy of radiation. A blue component due to either phosphor photoluminescence or InGaN electroluminescence with the peak wavelength at about 460 nm was found to be an optimal one for the high-fidelity, color-dulling, and color-preference LEDs. The high-fidelity and color-preference LEDs need red phosphors with the peak wavelength of 610-615 nm. The high-fidelity LEDs were shown to require a true green (~530 nm) phosphor component, whereas a cyan (~510 nm) component is the prerequisite of the color-saturating and color-preference LEDs. Deep-blue (~445 nm) and deep-red (~625 nm) components are required for the color-saturating LEDs. A broad yellow band similar to that of Ce(3+) emission is to be used in the color-dulling LEDs. The SPDs of practical phosphor blends for the high-fidelity, color-saturating, and color-preference p-c LEDs are demonstrated.
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40
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CHEN G, ZHUANG W, HU Y, LIU Y, LIU R, HE H. Luminescence properties of Eu2+-doped Ba3Si6O12N2 green phosphor: concentration quenching and thermal stability. J RARE EARTH 2013. [DOI: 10.1016/s1002-0721(12)60243-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Takeda T, Xie RJ, Hirosaki N, Matsushita Y, Honma T. Manganese valence and coordination structure in Mn,Mg-codoped γ-AlON green phosphor. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.07.035] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang YF, Wang YF, Gao JK, Lee MH, He W, Xu X, Hao LY, Chen JH. First-principle Studies on Enhanced Optical Stability of BaMgAl10O17:Eu2+ Phosphor by SiN Doping. CHINESE J CHEM PHYS 2012. [DOI: 10.1088/1674-0068/25/04/398-402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Yeh CW, Li Y, Wang J, Liu RS. Appropriate green phosphor of SrSi2O2N2:Eu2+,Mn2+ for AC LEDs. OPTICS EXPRESS 2012; 20:18031-18043. [PMID: 23038351 DOI: 10.1364/oe.20.018031] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
An AC (alternating current) LED exhibited the advantages of a low drive current, low static electricity, lack of a need for a rectifier, and high extraction efficiency. The input operating voltage of an AC LED is around 80V, and its operating frequency is 120 Hz or less. When the voltage is converted, a time gap of 1/120 s (10 ms), called dead time, is generated. This time gap is closely related to the scintillation phenomenon. Therefore, AC LEDs that have a phosphor composition, whose half-life composition can compensate for dead time that is generated during the voltage conversion, are sought to solve the problem of scintillation. The object of this work is to provide a phosphor SrSi(2)O(2)N(2):Eu(2+),Mn(2+) for AC LEDs, in which the dead time that is generated during the voltage conversion is compensated for by the half-life of the phosphor.
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Affiliation(s)
- Chiao-Wen Yeh
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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ZHOU T, SONG Z, BIAN L, REN Q, LIU Q. Synthesis and luminescence properties of europium activated Ca3Al2O6-Sr3Al2O6 system. J RARE EARTH 2012. [DOI: 10.1016/s1002-0721(12)60103-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kitabatake T, Uchikoshi T, Munakata F, Sakka Y, Hirosaki N. Optical and adhesive properties of composite silica-impregnated Ca-α-SiAlON:Eu2+ phosphor films prepared on silica glass substrates. Ann Ital Chir 2012. [DOI: 10.1016/j.jeurceramsoc.2011.06.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Thomas S, Oró-Solé J, Glorieux B, Jubera V, Buissette V, Le Mercier T, Garcia A, Fuertes A. New luminescent rare earth activated oxynitridosilicates and oxynitridogermanates with the apatite structure. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm35168d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Masubuchi Y, Yamakami C, Motohashi T, Kikkawa S. Ammonolysis of HTiNbO 5– n-Propylamine Intercalation Compound. CHEM LETT 2011. [DOI: 10.1246/cl.2011.1238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ohashi Y, Motohashi T, Masubuchi Y, Moriga T, Murai K, Kikkawa S. Preparation, crystal structure, and superconductive characteristics of new oxynitrides (Nb1−xMx)(N1−yOy) where M=Mg, Si, and x≈y. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.06.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Zeuner M, Pagano S, Schnick W. Nitridosilicate und Oxonitridosilicate: von keramischen Materialien zu struktureller und funktioneller Diversität. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201005755] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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