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Li H, Liang Y, Liu S, Zhang W, Bi Y, Gong Y, Lei W. Crystal phase transition and polyhedron transformation towards the evolution of photoluminescence and the improvement of thermal stability in efficient blue-emitting Ba 0.47-xSr 0.50+xAl 2Si 2O 8:Eu 2. Dalton Trans 2021; 50:12147-12158. [PMID: 34519741 DOI: 10.1039/d1dt01140e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Investigations into novel single-phase phosphors with outstanding luminescence properties and excellent thermal stability are urgently needed in the lighting field. In this work, a crystal phase transition and polyhedron transformation strategy via cation substitution has been proposed. Via controlling the Sr/Ba ratio, the structural evolution of the phosphor from a monocelsian phase to a hexacelsian or feldspar phase and the variation of the local environments of Eu2+ sites are correspondingly studied in Ba0.47-xSr0.50+xAl2Si2O8:0.03Eu. Consequently, the optimal Ba0.17Sr0.80Al2Si2O8:0.03Eu sample exhibits a higher intensity, up to 15.2-fold that of Ba0.97Al2Si2O8:0.03Eu. A narrower full-width-at-half-maximum of 73 nm, better color purity of 82.96%, and an internal quantum yield of 82.3% can be realized. With an increase in temperature, the emission intensity losses of samples from x = -10.0-47.0% are no more than 10.0% at 473 K. Moreover, a WLED (CCT = 5210 K; CRI = 90.3) fabricated using Ba0.17Sr0.80Al2Si2O8:0.03Eu displays warmer white light than one fabricated using BaMgAl10O17:Eu under the same assembly and test conditions. Analysis shows that the structural evolution with reduced polyhedral symmetry and the condensed crystal structure with fortified rigidity are responsible for the improvement in properties. This discovery demonstrates that the utilization of a crystal phase transition and symmetrical coordination is an efficient way to develop novel efficient phosphors and other related materials.
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Affiliation(s)
- Haoran Li
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
| | - Yujun Liang
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
| | - Shiqi Liu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
| | - Weilun Zhang
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
| | - Yanying Bi
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
| | - Yuming Gong
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
| | - Wen Lei
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China. .,School of Electrical, Electronic and Computer Engineering, The University of Western Australia, 35 Stirling Highway Crawley, WA 6009, Australia.
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Castaing V, Monteiro C, Sontakke AD, Asami K, Xu J, Fernández-Carrión AJ, Brik MG, Tanabe S, Allix M, Viana B. Hexagonal Sr 1-x/2Al 2-xSi xO 4:Eu 2+,Dy 3+ transparent ceramics with tuneable persistent luminescence properties. Dalton Trans 2020; 49:16849-16859. [PMID: 33179669 DOI: 10.1039/d0dt03137b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Co-doped hexagonal Sr1-x/2Al2-xSixO4:Eu2+,Dy3+ (0.1 ≤ x ≤ 0.5) transparent ceramics have been elaborated by full glass crystallization. The compositions with low SiO2 content (x ≤ 0.4) require fast quenching conditions to form glass, i.e. specific elaboration processes such as aerodynamic levitation coupled to laser heating, whereas the x = 0.5 glass composition can be prepared on a large scale by the classic melt-quenching method in commercial furnaces. After a single thermal treatment, the resulting SrAl2O4-based transparent ceramics show varying photoluminescence emission properties when x increases. These variations are also observable in persistent luminescence, resulting in an afterglow colour-tuning ranging from green to light blue. Afterglow excitation spectra highlight the possible activation in the visible range of the obtained persistent luminescence. Indeed, persistent luminescence of hexagonal Sr0.75Al1.5Si0.5O4:Eu2+,Dy3+ large transparent ceramics has been successfully charged using a typical smartphone low power white light source. Moreover, thermoluminescence glow curves of samples containing different Dy3+ doping concentrations are studied to gain insights regarding the traps' origin and depth. Coupling thermoluminescence results together with luminescence thermal quenching and band gap calculations appear useful to understand the charge trapping and detrapping evolution with the material composition. Varying the Si-content in hexagonal Sr1-x/2Al2-xSixO4:Eu2+,Dy3+ compounds appears as a promising strategy to obtain transparent materials with tuneable green to light blue persistent luminescence.
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Affiliation(s)
- Victor Castaing
- Chimie ParisTech, Institut de Recherche de Chimie Paris, PSL Research University, CNRS, Paris 75005, France.
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Jiang H, Jia Y, Qu T, Pan Y, Yang K, Luo H. Yellow Persistent Phosphor Ba 13.35Al 30.7Si 5.3O 70:Eu 2+,Tm 3+ from the Energy Regulation of Rare-Earth Ions. ACS OMEGA 2019; 4:6923-6930. [PMID: 31459806 PMCID: PMC6648063 DOI: 10.1021/acsomega.9b00180] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 03/07/2019] [Indexed: 05/31/2023]
Abstract
The luminescence properties of Ba13.35Al30.7Si5.3O70:Eu2+ and Ba13.35Al30.7Si5.3O70:Eu2+,Tm3+ phosphors are presented. After being excited by a light source, Ba13.35Al30.7Si5.3O70:Eu2+,Tm3+ phosphors emit intense yellow long persistent luminescence covering the region from 450 to 700 nm, which can last about 8 h. Thermoluminescence curves were demonstrated to analyze the trapping nature of persistent luminescence. Tm3+ is added to improve the long persistent luminescence properties of phosphors. The mechanism of persistent luminescence has been studied.
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Affiliation(s)
- Haijing Jiang
- State
Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Yonglei Jia
- Department
of Photoelectric Engineering, College of Advanced Interdisciplinary
Studies, National University of Defense
Technology, Changsha, Hunan 410073, P. R. China
| | - Tianliang Qu
- Department
of Photoelectric Engineering, College of Advanced Interdisciplinary
Studies, National University of Defense
Technology, Changsha, Hunan 410073, P. R. China
| | - Yao Pan
- Department
of Photoelectric Engineering, College of Advanced Interdisciplinary
Studies, National University of Defense
Technology, Changsha, Hunan 410073, P. R. China
| | - Kaiyong Yang
- Department
of Photoelectric Engineering, College of Advanced Interdisciplinary
Studies, National University of Defense
Technology, Changsha, Hunan 410073, P. R. China
| | - Hui Luo
- Department
of Photoelectric Engineering, College of Advanced Interdisciplinary
Studies, National University of Defense
Technology, Changsha, Hunan 410073, P. R. China
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Ju H, Qian R, Deng X, Li Y, Wang B, Weng Z. Synthesis, structure and luminescent properties of a new white phosphor Ba7(BO3)3(SiO4)Cl:Dy3+ for light-emitting diodes. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Steudel F, Johnson JA, Johnson CE, Schweizer S. Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E828. [PMID: 29772832 PMCID: PMC5978205 DOI: 10.3390/ma11050828] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 05/02/2018] [Accepted: 05/09/2018] [Indexed: 11/17/2022]
Abstract
The application of Mössbauer spectroscopy to luminescent materials is described. Many solids doped with europium are luminescent, i.e., when irradiated with light they emit light of a longer wavelength. These materials therefore have practical applications in tuning the light output of devices like light emitting diodes. The optical properties are very different for the two possible valence states Eu 2 + and Eu 3 + , the former producing ultraviolet/visible light that shifts from violet to red depending on the host and the latter red light, so it is important to have a knowledge of their behavior in a sample environment. Photoluminescence spectra cannot give a quantitative analysis of Eu 2 + and Eu 3 + ions. Mössbauer spectroscopy, however, is more powerful and gives a separate spectrum for each oxidation state enabling the relative amount present to be estimated. The oxidation state can be identified from its isomer shift which is between - 12 and - 15 mm/s for Eu 2 + compared to around 0 mm/s for Eu 3 + . Furthermore, within each oxidation state, there are changes depending on the ligands attached to the europium: the shift is more positive for increased covalency of the bonding ligand X, or Eu concentration, and decreases for increasing Eu⁻X bond length.
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Affiliation(s)
- Franziska Steudel
- Fraunhofer Application Center for Inorganic Phosphors, Branch Lab of Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Lübecker Ring 2, 59494 Soest, Germany.
| | | | | | - Stefan Schweizer
- Fraunhofer Application Center for Inorganic Phosphors, Branch Lab of Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Lübecker Ring 2, 59494 Soest, Germany.
- Faculty of Electrical Engineering, South Westphalia University of Applied Sciences, Lübecker Ring 2, 59494 Soest, Germany.
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Li S, Yu L, Man X, Zhong J, Sun W. Photoluminescent properties of Eu3+-Eu2+activated MAl2SixO2x + 4(M = Mg, Ca, Sr, Ba) phosphors prepared in air. LUMINESCENCE 2017; 33:391-398. [DOI: 10.1002/bio.3426] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 09/20/2017] [Accepted: 10/01/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Songchu Li
- College of Materials Science and Engineering; Nanchang University; Nanchang P. R. China
| | - Lixin Yu
- College of Materials Science and Engineering; Nanchang University; Nanchang P. R. China
| | - Xiaoqin Man
- College of Materials Science and Engineering; Nanchang University; Nanchang P. R. China
| | - Jianlin Zhong
- College of Materials Science and Engineering; Nanchang University; Nanchang P. R. China
| | - Wei Sun
- College of Materials Science and Engineering; Nanchang University; Nanchang P. R. China
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Li L, Liu X. Effects of changing the M2+ cation on the crystal structure and optical properties of divalent samarium-doped MAl2Si2O8 (M = Ca, Sr, Ba). RSC Adv 2015. [DOI: 10.1039/c4ra15391j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The photoluminescence properties and theoretical analysis of Sm2+ doped MAl2Si2O8 (M = Ca, Sr, Ba) were reported. The theoretical analysis is in good agreement with our experimental results.
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Affiliation(s)
- Ling Li
- Ministry-of-Education Key Laboratory for the Synthesis and Applications of Organic Functional Molecules
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials
- Hubei University
- Wuhan 430062
- China
| | - Xiaoguang Liu
- Ministry-of-Education Key Laboratory for the Synthesis and Applications of Organic Functional Molecules
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials
- Hubei University
- Wuhan 430062
- China
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Pawade V, Dhoble N, Dhoble S. Rare earth (Eu2+,Ce3+) activated BaAl2Si2O8 blue emitting phosphor. J RARE EARTH 2014. [DOI: 10.1016/s1002-0721(14)60113-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Brgoch J, Kloß SD, Denault KA, Seshadri R. Accessing (Ba1-xSrx)Al2Si2O8:Eu Phosphors for Solid State White Lighting via Microwave-assisted Preparation: Tuning Emission Color by Coordination Environment. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201400003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Dai WB, Zhou M, Xian ZY, Zeng LK. Structure and photoluminescence characteristics of europium(iii) doped in CaAl2Si2O8phosphors. RSC Adv 2014. [DOI: 10.1039/c4ra02213k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of Eu3+activated CaAl2Si2O8phosphors have been synthesized at 1350 °C in air, and their photoluminescence properties have been investigated as a function of activator concentrations.
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Affiliation(s)
- W. B. Dai
- State Key Laboratory of Luminescent Materials
- South China University of Technology
- China
| | - M. Zhou
- School of Materials Science and Engineering
- South China University of Technology
- China
| | - Z. Y. Xian
- School of Materials Science and Engineering
- South China University of Technology
- China
| | - L. K. Zeng
- School of Materials Science and Engineering
- South China University of Technology
- China
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Dai WB. Investigation of the luminescent properties of Ce3+ doped and Ce3+/Mn2+ co-doped CaAl2Si2O8 phosphors. RSC Adv 2014. [DOI: 10.1039/c3ra47156j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Pereyda-Pierre C, Meléndrez R, García R, Pedroza-Montero M, Barboza-Flores M. Persistent luminescence and thermoluminescence of UV/VIS -irradiated SrAl2O4: Eu2+, Dy3+ phosphor. RADIAT MEAS 2011. [DOI: 10.1016/j.radmeas.2011.07.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Van den Eeckhout K, Smet PF, Poelman D. Luminescent Afterglow Behavior in the M₂Si₅N₈: Eu Family (M = Ca, Sr, Ba). MATERIALS (BASEL, SWITZERLAND) 2011; 4:980-990. [PMID: 28879962 PMCID: PMC5448633 DOI: 10.3390/ma4060980] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Revised: 05/18/2011] [Accepted: 05/26/2011] [Indexed: 11/16/2022]
Abstract
Persistent luminescent materials are able to emit light for hours after being excited. The majority of persistent phosphors emit in the blue or green region of the visible spectrum. Orange- or red-emitting phosphors, strongly desired for emergency signage and medical imaging, are scarce. We prepared the nitrido-silicates Ca₂Si₅N₈:Eu (orange), Sr₂Si₅N₈:Eu (reddish), Ba₂Si₅N₈:Eu (yellowish orange), and their rare-earth codoped variants (R = Nd, Dy, Sm, Tm) through a solid state reaction, and investigated their luminescence and afterglow properties. In this paper, we describe how the persistent luminescence is affected by the type of codopant and the choice and ratio of the starting products. All the materials exhibit some form of persistent luminescence, but for Sr₂Si₅N₈:Eu,R this is very weak. In Ba₂Si₅N₈:Eu the afterglow remains visible for about 400 s, and Ca₂Si₅N₈:Eu,Tm shows the brightest and longest afterglow, lasting about 2,500 s. For optimal persistent luminescence, the dopant and codopant should be added in their fluoride form, in concentrations below 1 mol%. A Ca₃N₂ deficiency of about 5% triples the afterglow intensity. Our results show that Ba₂Si₅N₈:Eu(,R) and Ca₂Si₅N₈:Eu(,R) are promising persistent phosphors for applications requiring orange or red light.
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Affiliation(s)
- Koen Van den Eeckhout
- LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281/S1, 9000 Gent, Belgium.
| | - Philippe F Smet
- LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281/S1, 9000 Gent, Belgium.
| | - Dirk Poelman
- LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281/S1, 9000 Gent, Belgium.
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Dong G, Xiao X, Zhang L, Ma Z, Bao X, Peng M, Zhang Q, Qiu J. Preparation and optical properties of red, green and blue afterglow electrospun nanofibers. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02851g] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Li Y, Xiao L, Liu Y, Ai P, Chen X. Synthesis of monodisperse spherical core-shell SiO 2-SrAl 2Si 2O 8: Eu 2+ phosphors by hydrothermal homogeneous precipitation method. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2010; 11:045003. [PMID: 27877352 PMCID: PMC5090343 DOI: 10.1088/1468-6996/11/4/045003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2009] [Revised: 09/20/2010] [Accepted: 07/21/2010] [Indexed: 06/06/2023]
Abstract
Nanocrystalline SrAl2Si2O8 :Eu2+ phosphor layers were coated on nonaggregated, monodisperse and spherical SiO2 particles using a hydrothermal homogeneous precipitation. After annealing at 1100 °C, core-shell SiO2@SrAl2Si2O8 :Eu2+ particles were obtained. They were characterized with x-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy and photoluminescence techniques. XRD analysis confirmed the formation of SiO2 @SrAl2Si2O8 :Eu2+ particles; it indicated that the SrAl2Si2O8 :Eu2+ shells on SiO2 particles consisted of hexagonal crystallites. The core-shell phosphors obtained are well-dispersed submicron spherical particles with a narrow size distribution. The thickness of the coated layer is approximately 20-40 nm. Under ultraviolet excitation (361 nm), the particles emit blue light at about 440 nm due to the Eu2+ ions in their shells.
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Van den Eeckhout K, Smet PF, Poelman D. Persistent Luminescence in Eu2+-Doped Compounds: A Review. MATERIALS 2010. [PMCID: PMC5445854 DOI: 10.3390/ma3042536] [Citation(s) in RCA: 265] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In 1996, Matsuzawa et al. reported on the extremely long-lasting afterglow of SrAl2O4:Eu2+ codoped with Dy3+ ions, which was more than 10-times brighter than the previously widely used ZnS:Cu,Co. Since then, research for stable and efficient persistent phosphors has continuously gained popularity. However, even today - almost 15 years after the discovery of SrAl2O4:Eu2+, Dy3+ - the number of persistent luminescent materials is still relatively low. Furthermore, the mechanism behind this phenomenon is still unclear. Although most authors agree on the general features, such as the existence of long-lived trap levels, many details are still shrouded in mystery. In this review, we present an overview of the important classes of known persistent luminescent materials based on Eu2+-emission and how they were prepared, and we take a closer look at the models and mechanisms that have been suggested to explain bright afterglow in various compounds.
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Affiliation(s)
- Koen Van den Eeckhout
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +32-9-264-4381; Fax: +32-9-264-4996
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