Tuned red NIR phosphorescence of polyurethane hybrid composites embedding metallic nanoclusters for oxygen sensing

Amela-Cortés, Maria; Paofai, Serge; Cordier, Stéphane; Folliot, Hervé; Molard, Yann

doi:10.1039/c5cc01867f

Cited by 71 publications

(79 citation statements)

References 43 publications

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“…Face-capped Mo 6 X i 8 X a 6 units containing octahedral molybdenum clusters are the basic buildings blocks of many inorganic solid state compounds, hybrid frameworks and nanomaterials [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Formation of Mo 6 cluster occurs at high temperatures via solid state reactions.…”

Section: Introductionmentioning

confidence: 99%

From Cs2Mo6Cl14 to Cs2Mo6Cl14·H2O and Vice Versa: Crystal Chemistry Investigations

et al. 2016

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International audienceWe report here the synthesis, the crystal structure and the luminescent properties of the new cluster compounds Cs2Mo6Cl14·H2O and Cs2Mo6Br14·H2O. Single-crystal X-ray diffraction performed on Cs2Mo6Cl14·H2O indicates that the compound crystallizes in the monoclinic space group C2/c with refined cell parameters a = 19.578 Å, b = 15.151 Å, c = 9.347 Å, and β = 115.64°. The structure can be described from discrete [Mo6Cl8iCl6a]2- anionic cluster units arranged in a “A–A’–A–A’” pseudo prismatic stacking parallel to (b, c) plane with both Cs+ cations and water molecules located between the layers. Moreover, the centric character of the trigonal structure of Cs2Mo6Cl14 was also studied by combination of single-crystal X-ray diffraction and both X-ray and neutron powder diffraction. The results suggest an important influence of the sample preparation on the symmetry of the crystal structure. The crystal structure relationship between the [Mo6Cl8iCl6a]2- anionic cluster unit arrangements in Cs2Mo6Cl14 and Cs2Mo6Cl14·H2O is discussed. Finally, the characterization of the luminescent properties of Cs2Mo6X14 and Cs2Mo6X14·H2O (X = Cl, Br) indicates that emission profile is comparable regardless existence of water molecule in the crystal structure. © 2016, Springer Science+Business Media New York

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Section: Introductionmentioning

confidence: 99%

From Cs2Mo6Cl14 to Cs2Mo6Cl14·H2O and Vice Versa: Crystal Chemistry Investigations

et al. 2016

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“…The 550 nm emission band is attributed to the photoluminescence generated by defects in ZnO nanocrystals,[32–37] while the 650 nm emission band is attributed to the [Mo 6 I i 8 (OOCC 2 F 5 ) a 6 ] 2- cluster units. [20] When the CMIF amount increases in the ZnO-containing solutions, no additional bands are observed, while the emission from ZnO nanocrystals decreases. The emission intensities at 550 nm are 60, 23, 12 and 4 for 200/0, 200/100, 200/200 and 200/400 solutions, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Such IQE values for both powders and films are comparable to those of the previously reported nanocomposites. [20] The differences in the lower wavelength part may be related to the coexistence of different species, namely ZnO, PVP and soda lime glass. These results suggest that an improvement of the QE performance of CMIF is possible via dispersion into a matrix.…”

Section: Resultsmentioning

confidence: 99%

“…All data were consistent with previously published results. [20] The ZnO colloid was synthesized by a sol-gel route as described in a previously reported procedure. [24] The ZnO concentration of the colloidal solution in ethanol after purification was 0.5 M, as determined by inductively coupled plasma optical emission spectrometry (ICP-OES) measurements.…”

Section: Methodsmentioning

confidence: 99%

“…Cs 2 Mo 6 I 8 (C 2 F 5 COO) 6 cluster compound is based on [Mo 6 I 8 (C 2 F 5 COO) 6 ] 2- molybdenum cluster units showing a higher quantum yield compared to values observed for their halide counterparts. [20–23] In this work, we investigated the luminescence properties of a mixture of ZnO nanocrystals and Cs 2 Mo 6 I 8 (OOC 2 F 5 ) 6 cluster-based compound dispersed into a PVP matrix in solution and dip-coated thin films. By varying the ratios between ZnO and CMIF, and the excitation wavelength, a large variety of emitted colors from blue to red, as well as white, was achieved.…”

Section: Introductionmentioning

confidence: 99%

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Visible tunable lighting system based on polymer composites embedding ZnO and metallic clusters: from colloids to thin films

Truong

Dierre

Grasset

et al. 2016

Science and Technology of Advanced Materials

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The development of phosphor devices free of heavy metal or rare earth elements is an important issue for environmental reasons and energy efficiency. Different mixtures of ZnO nanocrystals with Cs2Mo6I8(OOC2F5)6 cluster compound (CMIF) dispersed into polyvinylpyrrolidone matrix have been prepared by very simple and low cost solution chemistry. The resulting solutions have been used to fabricate highly transparent and luminescent films by dip coating free of heavy metal or rare earth elements. The luminescence properties of solution and dip-coated films were investigated. The luminescence of such a system is strongly dependent on the ratios between ZnO and CMIF amounts, the excitation wavelength and the nature of the system. By varying these two parameters (ratio and wavelength), a large variety of colors, from blue to red as well as white, can be achieved. In addition, differences in the luminescence properties have been observed between solutions and thin films as well as changes of CMIF emission band maximum wavelength. This may suggest some possible interactions between the different luminophore centers, such as energy transfer or ligands exchange on the Mo6 clusters.

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Reversible Guest‐Induced Long‐Lasting Luminescence

Sebastian,

Seco,

Rodríguez‐Diéguez

et al. 2023

Organic and Inorganic Materials Based Sensors

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Tuned red NIR phosphorescence of polyurethane hybrid composites embedding metallic nanoclusters for oxygen sensing

Cited by 71 publications

References 43 publications

From Cs2Mo6Cl14 to Cs2Mo6Cl14·H2O and Vice Versa: Crystal Chemistry Investigations

From Cs2Mo6Cl14 to Cs2Mo6Cl14·H2O and Vice Versa: Crystal Chemistry Investigations

Visible tunable lighting system based on polymer composites embedding ZnO and metallic clusters: from colloids to thin films

Reversible Guest‐Induced Long‐Lasting Luminescence

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