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Kot K, Oczko G, Puchalska M, Starynowicz P. Relationships between structural and spectroscopic properties of complexes of o-phenanthroline and 2,2′-bipyridine with lanthanide (Ln = Sm, Eu) thiocyanates. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Structural and spectroscopic studies of heavy lanthanide complexes with o-phenanthroline and isothiocyanate. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.114119] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pawlak-Jarosz N, Oczko G, Starynowicz P, Kot K. Relationship between the optical properties and the structure of a new complex: Nd(III)-isothiocyanate-2,2′-bipyridine. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.05.094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Kot K, Oczko G. Synthesis, crystal structure and optical properties of new (Nd, Sm) and other lanthanide (Ln = Pr) complexes with 1,10-phenanthroline and thiocyanate. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.03.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Correlation between spectroscopic characteristics and polymeric structure of Er3+ complex with pent-4-ynoate. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.01.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pawlak N, Oczko G. Optical properties of heavy lanthanide maleates in solution and crystal form. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.02.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Fernandes M, Nobre SS, Rodrigues LC, Gonçalves A, Rego R, Oliveira MC, Ferreira RAS, Fortunato E, Silva MM, Carlos LD, Bermudez VDZ. Li(+)- and Eu(³+)-doped poly(ε-caprolactone)/siloxane biohybrid electrolytes for electrochromic devices. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2953-2965. [PMID: 21774498 DOI: 10.1021/am200391b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The sol-gel process has been successfully combined with the "mixed cation" effect to produce novel luminescent and ion conducting biohybrids composed of a diurethane cross-linked poly(ε-caprolactone) (PCL530)/siloxane hybrid network (PCL stands for the poly(ε-caprolactone) biopolymer and 530 is the average molecular weight in gmol(-1)) doped with a wide range of concentrations of lithium and europium triflates (LiCF(3)SO(3) and Eu(CF(3)SO(3))(3), respectively) (molar ratio of ca. 50:50). The hybrid samples are all semicrystalline: whereas at n = 52.6 and 27.0 (n, composition, corresponds to the number of (C(═O)(CH(2))(5)O) repeat units of PCL(530) per mixture of Li(+) and Eu(3+) ions) a minor proportion of crystalline PCL(530) chains is present, at n = 6.1, a new crystalline phase emerges. The latter electrolyte is thermally stable up to 220 °C and exhibits the highest conductivity over the entire range of temperatures studied (3.7 × 10(-7) and 1.71 × 10(-4) S cm(-1) at 20 and 102 °C, respectively). According to infrared spectroscopic data, major modifications occur in terms of hydrogen bonding interactions at this composition. The electrochemical stability domain of the biohybrid sample with n = 27 spans more than 7 V versus Li/Li(+). This sample is a room temperature white light emitter. Its emission color can be easily tuned across the Commission Internationale d'Éclairage (CIE) chromaticity diagram upon simply changing the excitation wavelength. Preliminary tests performed with a prototype electrochromic device (ECD) comprising the sample with n = 6.1 as electrolyte and WO(3) as cathodically coloring layer are extremely encouraging. The device exhibits switching time around 50 s, an optical density change of 0.15, good open circuit memory under atmospheric conditions (ca. 1 month) and high coloration efficiency (577 cm(2) C(-1) in the second cycle).
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Affiliation(s)
- M Fernandes
- Department of Chemistry and CQ-VR, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
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Barbosa AJ, Maia LJQ, Montanari B, Gonçalves RR, Messaddeq Y, Ferreira RAS, Carlos LD, Ribeiro SJL. Enhanced Eu3+ emission in aqueous phosphotungstate colloidal systems: stabilization of polyoxometalate nanostructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14170-14176. [PMID: 20684653 DOI: 10.1021/la100525h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Luminescent Eu(3+)-containing polyphosphate-tungstate aqueous colloidal systems were prepared and studied as a function of the relative polyphosphate-tungstate content. In polyphosphate-rich solutions, Eu(3+) ions occupy cagelike sites composed of phosphate groups from the metaphosphate chains. In these sites, an average number of 0.5 water molecule coordinates to an Eu(3+) ion and the (5)D(0) emission quantum efficiency is 0.22. Tungstate addition leads to important modifications in neighboring Eu(3+) leading to coordination sites in the aqueous medium where metal ions are completely hidden from interactions with solvent molecules. Transmission electron microscopy results clearly show W-rich nanoparticles with sizes between 5 and 10 nm for all tungstate relative concentrations. For high tungstate relative contents (above 30 mol %), spectroscopic results suggest the presence of Eu(3+) in polyoxometalate (POM)-like sites by comparison with the well-known decatungstoeuropate [EuW(10)O(36)](9-) structure. These new aqueous colloids display surprisingly high (5)D(0) emission quantum efficiencies of ca 80% because of the strong ligand field provided by tungstate POM ligands and the complete absence of water molecules from the Eu(3+) first coordination shell.
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Affiliation(s)
- A J Barbosa
- Institute of Chemistry, São Paulo State University-UNESP, CP 355, Araraquara-SP 14801-970, Brazil
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Granadeiro CM, Ferreira RAS, Soares-Santos PCR, Carlos LD, Trindade T, Nogueira HIS. Lanthanopolyoxotungstates in silica nanoparticles: multi-wavelength photoluminescent core/shell materials. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b919691a] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Bruno SM, Ferreira RAS, Almeida Paz FA, Carlos LD, Pillinger M, Ribeiro-Claro P, Gonçalves IS. Structural and Photoluminescence Studies of a Europium(III) Tetrakis(β-diketonate) Complex with Tetrabutylammonium, Imidazolium, Pyridinium and Silica-Supported Imidazolium Counterions. Inorg Chem 2009; 48:4882-95. [DOI: 10.1021/ic900274a] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sofia M. Bruno
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal,
| | - Rute A. S. Ferreira
- Department of Physics, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | | | - Luís D. Carlos
- Department of Physics, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Martyn Pillinger
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal,
| | - Paulo Ribeiro-Claro
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal,
| | - Isabel S. Gonçalves
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal,
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Carlos LD, Ferreira RAS, Bermudez VDZ, Ribeiro SJL. Lanthanide-containing light-emitting organic-inorganic hybrids: a bet on the future. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2009; 21:509-34. [PMID: 21161975 DOI: 10.1002/adma.200801635] [Citation(s) in RCA: 529] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Interest in lanthanide-containing organic-inorganic hybrids has grown considerably during the last decade, with the concomitant fabrication of materials with tunable attributes offering modulated properties. The potential of these materials relies on exploiting the synergy between the intrinsic characteristics of sol-gel derived hosts (highly controlled purity, versatile shaping and patterning, excellent optical quality, easy control of the refractive index, photosensitivity, encapsulation of large amounts of isolated emitting centers protected by the host) and the luminescence features of trivalent lanthanide ions (high luminescence quantum yield, narrow bandwidth, long-lived emission, large Stokes shifts, ligand-dependent luminescence sensitization). Promising applications may be envisaged, such as light-emitting devices, active waveguides in the visible and near-IR spectral regions, active coatings, and bio-medical actuators and sensors, opening up exciting directions in materials science and related technologies with significant implications in the integration, miniaturization, and multifunctionalization of devices. This review provides an overview of the latest advances in Ln(3+)-containing siloxane-based hybrids, with emphasis on the different possible synthetic strategies, photoluminescence features, empirical determination.
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Affiliation(s)
- Luís D Carlos
- Department of Physics, CICECO, University of Aveiro 3810-193 Aveiro (Portugal)
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Fernandes M, Nobre SS, Gonçalves MC, Charas A, Morgado J, Ferreira RAS, Carlos LD, de Zea Bermudez V. Dual role of a di-urethanesil hybrid doped with europium β-diketonate complexes containing either waterligands or a bulky chelating ligand. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b813155d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bruno SM, Coelho AC, Ferreira RAS, Carlos LD, Pillinger M, Valente AA, Ribeiro-Claro P, Gonçalves IS. MCM-41 Derivatised with Pyridyl Groups and Its Use as a Support for Luminescent Europium(III) Complexes. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800367] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sá Ferreira RA, Karmaoui M, Nobre SS, Carlos LD, Pinna N. Optical Properties of Lanthanide-Doped Lamellar Nanohybrids. Chemphyschem 2006; 7:2215-22. [PMID: 16941561 DOI: 10.1002/cphc.200600317] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this article a detailed study of the optical properties of lanthanide doped lamellar nanohybrids synthesized by the "benzyl alcohol route" is presented. The synthetic approach results in the formation of a highly ordered lamellar nanocomposite consisting of yttrium or gadolinium oxide crystalline layers with a confined thickness of about 0.6 nm, separated from each other by organic layers of intercalated benzoate molecules. When the inorganic layers are doped with optically-active lanthanide ions they show outstanding emission properties in the green (Tb(3+)), red (Eu(3+)) and near infrared (Nd(3+)). The local environment of the emitting ions and the energy transfer processes involving the phenyl ring of the benzoate complexes and the lanthanide ions are presented, as well as radiance and lifetime measurements. The radiance values are comparable and in some cases even larger than those of standard phosphors, proving that these nanohybrids can compete, from an emission efficiency point of view, with commercial phosphors. Furthermore, in these nanohybrids it is possible by simply changing the excitation wavelength, to tune the emission colour chromaticity without loosing the radiance.
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Affiliation(s)
- Rute A Sá Ferreira
- Departamento de Física, CICECO, Universidade de Aveiro 3810-193 Aveiro, Portugal
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Oczko G, Starynowicz P. Comparison of optical properties and crystal structures of the praseodymium and europium chloroderivatives of acetates. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2004.12.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Soares-Santos PCR, Trindade T, Tomé AC, Rocha J, Sá Ferreira RA, Carlos LD, Almeida Paz FA, Klinowski J, Nogueira HIS. Lanthanide compounds containing a benzo-15-crown-5 derivatised [60]fullerene and the related [Tb(H2O)3(NO3)2(acac)]·C14H20O5supramolecular adduct. NEW J CHEM 2004. [DOI: 10.1039/b410068a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Malta O, Batista H, Carlos L. Overlap polarizability of a chemical bond: a scale of covalency and application to lanthanide compounds. Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00631-6] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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de Zea Bermudez V, Sá Ferreira RA, Carlos LD, Molina C, Dahmouche K, Ribeiro SJL. Coordination of Eu3+ Ions in Siliceous Nanohybrids Containing Short Polyether Chains and Bridging Urea Cross-links. J Phys Chem B 2001. [DOI: 10.1021/jp002665t] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- V. de Zea Bermudez
- Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, Apartado 202, 5001-911 Vila Real Codex, Portugal
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Carlos L, Sa Ferreira R, de Zea Bermudez V. An intra-Nd3+ visible to infrared conversion process in hybrid xerogels. Electrochim Acta 2000. [DOI: 10.1016/s0013-4686(99)00374-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ferry A, Furlani M, Franke A, Jacobsson P, Mellander BE. Spectroscopic studies of luminescent and ionically conducting Eu[N(CF3SO2)2]3-PPG4000 complexes. J Chem Phys 1998. [DOI: 10.1063/1.476844] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Carlos L, Assunção M, Mourão P, Alcácer L. Luminescence of non-hygroscopic polymer electrolytes modified by europium picrate complexes. Electrochim Acta 1998. [DOI: 10.1016/s0013-4686(97)10045-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Videira ALL, Carlos LD. Cation concentration and local ligand field of polyether–salt complexes. J Chem Phys 1996. [DOI: 10.1063/1.472617] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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