Magneto-optical investigations of rare earth doped sol–gel derived silicate xerogels

Secu, C.E.; Poloşan, Silviu; Secu, M.

doi:10.1016/j.jlumin.2011.04.031

Cited by 7 publications

(2 citation statements)

References 21 publications

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“…Among the RE 3+ ions, Eu 3+ ions are widely used as green-red light emitting activators, where the characteristic luminescence properties are to the intra-configurational 4f 6 -4f 6 transitions ( 5 D 0 → 7 F J , J = 0-4); see Figure 4. Moreover, they are widely studied as probe-ions for local site symmetry in various materials [24,25] and have been used to investigate the sol-gel process [8,[26][27][28]. The electric-dipole 7 D 0 → 5 F 2 transition is sensitive to the environment and therefore the intensity ratio between the two visible emissions 5 D 0 -7 F 2 / 5 D 0 -7 F 1 is highly dependent on the Eu 3+ -ion environment.…”

Section: Optical Properties: Photoluminescence Up-conversion Luminescence and Thermoluminescencementioning

confidence: 99%

Optical Properties of Transparent Rare-Earth Doped Sol-Gel Derived Nano-Glass Ceramics

Secu

Bartha

2021

Materials

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Rare-earth doped oxyfluoride glass ceramics represent a new generation of tailorable optical materials with high potential for optical-related applications such as optical amplifiers, optical waveguides, and white LEDs. Their key features are related to the high transparency and remarkable luminescence properties, while keeping the thermal and chemical advantages of oxide glasses. Sol-gel chemistry offers a flexible synthesis approach with several advantages, such as lower processing temperature, the ability to control the purity and homogeneity of the final materials on a molecular level, and the large compositional flexibility. The review will be focused on optical properties of sol-gel derived nano-glass ceramics related to the RE-doped luminescent nanocrystals (fluorides, chlorides, oxychlorides, etc.) such as photoluminescence, up-conversion luminescence, thermoluminescence and how these properties are influenced by their specific processing, mostly focusing on the findings from our group and similar ones in the literature, along with a discussion of perspectives, potential challenges, and future development directions.

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Section: Optical Properties: Photoluminescence Up-conversion Luminescence and Thermoluminescencementioning

confidence: 99%

Optical Properties of Transparent Rare-Earth Doped Sol-Gel Derived Nano-Glass Ceramics

Secu

Bartha

2021

Materials

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“…8 (top), no f-f bands were detected in the absorption spectrum for complex 4b probably because they were overlapped or buried underneath the strong metal-ligand chargetransfer band around 24000 cm -1 [28,32]. In the MCD spectrum (bottom), the structure of the MCD bands is very complicated due to the Zeeman splitting of the ground state and all the excited states [33]. Two characteristic MCD signals showing a positive A-term and a negative C-term occurred at 23510 and 21260 cm -1 , owing probably to the f-f transition from the 6 H6/2 ground state to the 6 P3/2 and 4 I13/2 excited states, respectively.…”

Section: H Nmr Studymentioning

confidence: 99%

Dinuclear lanthanoid(III) dithiocarbamato complexes bridged by (E)-N-benzylidenepicolinohydrazonate: Syntheses, crystal structures and spectroscopic properties

Yakubu

Suzuki

Kita

2019

Inorganica Chimica Acta

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E)-N-Benzylidenepicolinohydrazide (Hbphz) was used to synthesize a series of hydrazonatobridged homodinuclear Ln III 2 dithiocarbamato (RR'dtc -) complexes of the form [{Ln(RR' dtc)2}2(µ-bphz)2] {Ln = La, Pr, Nd, Sm or Eu; RR' = dimethyl-(Me2) or pyrrolidine-(pyr)}.X-ray crystallographic studies revealed that these complexes possessed a common head-to-tail type dinuclear structural motif in which two hydrazonato ligands bridged two Ln III centers in the -1 2 N(py),O:2 2 O,N(imine) mode and two RR'dtc ligands coordinated to each Ln III center. Interestingly, while the Sm III and Eu III complexes crystallized as simple 8:8-coordinate dinuclear molecules, the lighter Ln III (i.e. La III , Pr III and Nd III ) complexes afforded in some cases 9:9-coordinate molecules, where the ninth coordination site was occupied by a solvent ethanol or methanol molecule. Even for the lighter Ln III complexes, the complexes were solved in dichloromethane or chloroform as the 8:8-coordinate dimer, as revealed by 1 H NMR spectroscopy. In the UV-visible absorption and magnetic circular dichroism (MCD) spectra of the complexes, similar spectral patterns for ligand-centered and Laporte forbidden f-f transitions were observed. The MCD spectral studies demonstrated the characteristic magnetooptical behavior of the complexes.

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Optical spectroscopy methods for the characterization of sol–gel materials

Marques

Rojas-Hernández

Almeida

2021

J Sol-Gel Sci Technol

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Magneto-optical investigations of rare earth doped sol–gel derived silicate xerogels

Cited by 7 publications

References 21 publications

Optical Properties of Transparent Rare-Earth Doped Sol-Gel Derived Nano-Glass Ceramics

Optical Properties of Transparent Rare-Earth Doped Sol-Gel Derived Nano-Glass Ceramics

Dinuclear lanthanoid(III) dithiocarbamato complexes bridged by (E)-N-benzylidenepicolinohydrazonate: Syntheses, crystal structures and spectroscopic properties

Optical spectroscopy methods for the characterization of sol–gel materials

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