Excited states and energy transfer from donor cations to rare earths in the condensed phase

Reisfeld, Renata

doi:10.1007/3-540-07887-8_2

Cited by 92 publications

(21 citation statements)

References 67 publications

(65 reference statements)

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“…Therefore, it can be considered a standard to measure the relative intensity of the other bands 22 . The fact that the intensity ratio presents lower values for the hybrids indicates that Eu 3+ ions are located in sites with a lower symmetry, and these results are observed in other works [23][24][25] . The infrared spectra of the samples are shown in Figure 5 The spectra of the materials display bands associated with the vibrations of both inorganic and organic structural units.…”

Section: Resultssupporting

confidence: 82%

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

et al. 2011

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This work describes the hydrolytic sol-gel synthesis of silica particles prepared by a modified Stöber route, using the organofunctionalized alkoxide 3-methacryloxypropyl trimethoxysilane and tetraethylorthosilicate. The silica particles were obtained through basic catalysis from a mixture of precursor alkoxides, water, and isopropyl alcohol. Samples were prepared with change to the pre-hydrolysis and condensation time of tetraethylortosilicate, followed by addition of the organosilane 3-methacryloxypropyl trimethoxysilane. Eu 3+ ions were added to the alkoxides mixture, in order to obtain structural information about the silica particles. The samples were centrifuged, washed with ethanol, and dried at 50 °C. The xerogel was analyzed by thermogravimetric analysis, photoluminescence, transmission electron microscopy, and infrared spectroscopy. The photoluminescence spectra revealed Eu 3+ lines characteristic of the ion 5 D 0 → 7 F J (J = 0, 1, 2, 3, 4) transition. The thermogravimetric curve and infrared spectra confirmed the presence of the alkoxide organic group and water in the materials. Transmission electron microscopy showed spherical particles with varied size. The time of pre-hydrolysis and condensation as well as the addition of 3-methacryloxypropyl trimethoxysilane affect the final shape and size of the materials, so they can be used as control factors.

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Section: Resultssupporting

confidence: 82%

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

et al. 2011

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“…The corresponding transfer rate of k(B-A) = lit(B) = 1.7-107 s -~ between nearest neighbors is relatively small. This smallness may be ascribed to the very small spectral overlap (e.g., see [243,244]) between donor emission (site B) and acceptor absorption (site A).…”

Section: Radiationless Energy Transfer Between Different Sites In [Rumentioning

confidence: 99%

“…However, the absorption in this spectral region, resuking from site A, is relatively high. Consequently, the spectral overlap integral and therefore the energy transfer propability [243,244] from site C to site A is drastically increased compared to the transfer from site B to site A. Additionally, an energy transfer from site C to site B is possible. Therefore, a very effective energy transfer totally quenches the emission of such a higher lying site.…”

Section: Radiationless Energy Transfer Between Different Sites In [Rumentioning

confidence: 99%

Characterization of excited electronic and vibronic states of platinum metal compounds with chelate ligands by highly frequency-resolved and time-resolved spectra

Yersin

Humbs

Strasser

Topics in Current Chemistry

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The lowest excited electronic states of triplet character and related vibronic properties are discussed in detail on the basis of highly frequency-resolved and time-resolved emission and excitation spectra of per-protonated, per-deuterated, and partially deuterated [Pt(bpy)2] 2+, [Rh(bpy)3] 3+, [Ru(bpy)3] 2+, and [Os(bpy)3] ~+. Emphasis is placed on the use of the enormous amount of information displayed in well-resolved vibrational satellite structures. For comparison, IR data and Raman spectra are also used. In addition, data are given for [Ru(bpz)Pt(3-thpy) 2, Pt(2-thpy)(CO)(Cl), Pt(2-thpy) 2, Pt(qol)2, Pt(qtl)2. Trends and effects are also addressed, which are related to the amount of metal d-orbital mixing. In particular, we discuss the role of traps and sites in the context of high-resolution, site-selective, and line-narrowed spectra of chromophores doped into matrices; the interplay between states of ligand-centered 3rtrr* and ~MLCT character; localization versus delocalization behavior; radiative decay properties; zero-field splittings; spin-lattice relaxations via direct and Orbach mechanisms; Arrhenius behavior after time delay; Franck-Condon activities and Huang-Rhys factors; Franck-Condon versus Herzberg Teller activities and tunability of these activities under high magnetic fields; isotope marking and deuteration effects; aggregate formation of [Ru(bpy)3]2+; and radiationless energy transfer in neat [Ru(bpy)3](PF6) 2. These effects are in part treated in detail, but the aim is to use easy-to-follow descriptions. In particular, it is emphasized throughout this review that chemical tunability opens fascinating possibilities for controlled variation of physical properties.

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“…Thus, this band can be used as a standard for measuring the relative intensities of other bands in the spectrum [45]. Table 1 lists the relative areas of the bands in the emission spectrum of the europium (III) ion for the samples prepared with TEOS:MTMS or TEOS:DMDMS in EtOH containing either EuCl 3 and excited at 395 nm ( 5 L 6 level) or the Na 3 [Eu(dpa) 3 ] complex and excited at 290 or 396 nm.…”

Section: Photoluminescence (Pl)mentioning

confidence: 99%

Optical properties of Eu-doped hybrid materials prepared from dimethyl and methyl alkoxides precursors

Azevedo

Souza

Faria

et al. 2013

Journal of Luminescence

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Excited states and energy transfer from donor cations to rare earths in the condensed phase

Cited by 92 publications

References 67 publications

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

Characterization of excited electronic and vibronic states of platinum metal compounds with chelate ligands by highly frequency-resolved and time-resolved spectra

Optical properties of Eu-doped hybrid materials prepared from dimethyl and methyl alkoxides precursors

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