An intra-Nd3+ visible to infrared conversion process in hybrid xerogels

Carlos, Luı́s D.; Ferreira, Rute A. S.; Bermúdez, V. de Zea

doi:10.1016/s0013-4686(99)00374-6

Cited by 23 publications

(16 citation statements)

References 21 publications

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“…528 Variation of the polymer chain length also allows tuning of the emission color. 529,530 Lanthanide salts other than Eu(CF 3 SO 3 ) 3 that have been incorporated in diureasils are Eu(ClO 4 ) 3 , 531 EuCl 3 , 532 Nd(CF 3 SO 3 ) 3 , 533,534 and Tb(NO 3 ) 3 . 535 2,2′-Bipyridine acts as a sensitizer for Tb 3+ luminescence in silica-PEO hybrid materials (Figure 20).…”

Section: Bridged Polysilsesquioxanesmentioning

confidence: 99%

Lanthanide-Based Luminescent Hybrid Materials

2009

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Koen Binnemans was born in Geel, Belgium, in 1970. He obtained his M. Sc. degree (1992) and Ph.D. degree (1996) in Chemistry at the Catholic University of Leuven, under the supervision of Prof. C. Go ¨rller-Walrand. In the period 1999-2005, he was a postdoctoral fellow of the Fund for Scientific Research Flanders (Belgium). He did postdoctoral work with Prof. Jacques Lucas (Rennes, France) and Prof. Duncan W. Bruce (Exeter, U.K.). In 2000, he received the first ERES Junior Award (ERES, European Rare-Earth and Actinide Society). From 2002 until 2005, he was (parttime) associate professor. Presently, he is professor of chemistry at the Catholic University of Leuven. His current research interests are metalcontaining liquid crystals (metallomesogens), lanthanide-mediated organic reactions, lanthanide spectroscopy, luminescent molecular materials, and ionic liquids.

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Section: Bridged Polysilsesquioxanesmentioning

confidence: 99%

Lanthanide-Based Luminescent Hybrid Materials

2009

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“…silica network. These hybrid materials form transparent, elastomeric monoliths, and are able to dissolve luminescent guest molecules in high concentration (Bekiari et al, 1999;Carlos et al, 1999Carlos et al, , 2000aCarlos et al, , 2000bCarlos et al, , 2002Sá Ferreira et al, 2001 2001) covalently bound β-diketones (Hacac, Hbtfa, Hdbm and Hhfa) to a functionalized silica that was obtained by a sol-gel reaction between TEOS and 3chloropropyltrimethoxysilane. The β-diketones in their sodium form reacted with the functionalized silica, so that the β-diketones became linked to the silica matrix via the α-carbon.…”

Section: Ormosilsmentioning

confidence: 99%

Rare-earth beta-diketonates

Binnemans

2005

Handbook on the Physics and Chemistry of Rare Earths

403

303

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Contents 157 5.6. Solution structure 157 5.7. Electrochemical properties 158 5.8. Thermodynamic properties 159 5.9. Magnetic properties 159 5.10. Crystal-field splittings 160 5.11. Infrared spectra 161 5.12. Chirality sensing 161 5.13. Properties of hemicyanine dyes with βdiketonate counter ions 162 6. Luminescence of β-diketonate complexes 162 6.1. Photoluminescence 162 6.2. Electroluminescence 178 6.3. Triboluminescence 179 6.4. Sensitized chemiluminescence 183 7. From complexes to materials 185 7.1. Sol-gel glasses 185 7.2. Ormosils 186 7.3. β-Diketonates in polymer matrices 190 7.4. β-Diketonates in zeolites 195 7.5. Langmuir-Blodgett films (LB films) 197 7.6. Liquid crystals 200 7.7. Nonlinear optical materials 203 8. From materials to devices 205 8.1. Chelates for lasers 205 8.2. Organic light-emitting diodes (OLEDs) 206 8.3. Liquid crystal displays (LCDs) 216 8.4. Polymeric optical waveguides and amplifiers 217 9. NMR shift reagents 218 9.1. Historical development and general principles 218 9.2. Achiral shift reagents 221 9.3. Chiral shift reagents 226 10. Analytical applications 227 10.1. Trace analysis of lanthanide ions 227 10.2. Trace analysis of organic and biomolecular compounds 229 10.3. Luminescent visualization of latent fingerprints 230 10.4. Chemical sensors 232 10.5. Stationary phases in gas chromatography 232 11. Applications of volatile complexes 233 11.1. Volatile β-diketonate complexes 233 11.2. Gas chromatographic separation of the rare earths 237 11.3. Preparation of thin films by metalorganic chemical vapor deposition (MOCVD) 238 11.4. Preparation of thin films by atomic layer deposition (ALD) 241 11.5. Fuel additives 242 12. Solvent extraction 243 13. Catalytic properties 247

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“…Selfabsorption related with the lanthanide ions, is also observed in analogous erbium-based nanohybrids [29] and other hybrids containing Nd 3 + . [27,[30][31][32] The presence of these self-absorptions indicates that the visible light emitted by the phenyl rings is absorbed by the Nd 3 + ions and then probably converted into NIR emission, indicating the presence of a radiative energy transfer channel of visible-to-NIR energy conversion involving the phenyl-rings' excited states and the Nd 3 + levels. For the yttrium-based nanohybrids the decay curve is well reproduced by a single exponential function revealing a lifetime value of 0.049 AE 0.006 ms which is remarkably long for this type of hybrid which can undergo nonradiative deactivations.…”

Section: (465 Nm)mentioning

confidence: 99%

Optical Properties of Lanthanide‐Doped Lamellar Nanohybrids

Ferreira¹,

Karmaoui²,

Nobre³

et al. 2006

ChemPhysChem

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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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An intra-Nd3+ visible to infrared conversion process in hybrid xerogels

Cited by 23 publications

References 21 publications

Lanthanide-Based Luminescent Hybrid Materials

Lanthanide-Based Luminescent Hybrid Materials

Rare-earth beta-diketonates

Optical Properties of Lanthanide‐Doped Lamellar Nanohybrids

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