Luminescence and energy transfer of the europium (III) tungstate obtained via the Pechini method

Kodaira, Cláudia Akemi; Brito, Hermi F.; Malta, O.L.; Serra, Osvaldo Antônio

doi:10.1016/s0022-2313(02)00384-8

Cited by 351 publications

(167 citation statements)

References 36 publications

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“…These photoluminescence measurements were recorded at 77 K in the spectral range from 250 to 590 nm, with emission monitored on the hypersensitive 4 G 5/2 → 6 H 9/2 transition (around 643 nm). In the case of the Sm 3+ compound prepared by the Pechini method, the excitation spectrum displays a high intensity broad band around 275 nm and an overlapped low intensity band around 310 nm attributed to O→W 13 and O→Sm LMCT transitions, respectively. Besides, this excitation spectrum also contains narrow bands assigned to the 4f 5 intraconfigurational transitions characteristic of the Sm 3+ ion ( Table 2).…”

Section: Photoluminescence Investigationmentioning

confidence: 99%

“…12 Recently we have reported the preparation, characterization and photoluminescent studies of the RE 2 (WO 4 ) 3 system (where RE = La, Eu and Gd), which was produced by the Pechini method. [13][14][15] The electronic spectra of the RE 3+ ions present narrow and low intensity bands due to the shielding of the 4f electrons from ligand field effects by the electrons of the filled 5s and 5p sub-shells. 16 The Sm 3+ ion has an odd electron configuration ([Xe] 4f 5 ) labeled as a Kramer's ion, which requires that the electronic states of this ion be at least doubly degenerate by the ligand-field for any chemical environment.…”

Section: Introductionmentioning

confidence: 99%

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Photoluminescence behavior of the Sm3+ and Tb3+ ions doped into the Gd2(WO4)3 matrix prepared by the Pechini and ceramic methods

Kodaira¹,

Brito²,

Teotonio³

et al. 2004

J. Braz. Chem. Soc.

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The Gd 2 (WO 4 ) 3 :RE 3+ compounds (where RE 3+ = Sm and Tb) were prepared by the Pechini and ceramic methods and characterized by X-ray diffraction and infrared spectroscopy. These rare earth materials present high orange (Sm 3+ -compound) and green (Tb 3+ -compound) luminescence intensity under UV radiation. The excitation spectra of these compounds presented broad bands arising from ligand-to-metal charge transfer (O→W and O→RE 3+) and narrow bands from 4f-intraconfigurational transitions. The excitation spectra of Tb 3+ system also exhibit broad bands attributed to the interconfigurational transition (4f-5d). The emission spectra exhibited the , respectively, while a broad band assigned to the LMCT (O→W) is observed when the excitation is monitored on the O→W LMCT state around 270 nm. The experimental intensity parameters η Sm and η Eu present similar behaviors, suggesting that the Sm 3+ ion is in a highly polarizable chemical environment with similar covalent character of the metal-donor atom interaction to the tungstate doped europium system. The cross-relaxation process from the 5 D 3 to the 5 D 4 levels of the Gd 2 (WO 4 ) 3 :Tb 3+ system has been also reported.

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Section: Photoluminescence Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoluminescence behavior of the Sm3+ and Tb3+ ions doped into the Gd2(WO4)3 matrix prepared by the Pechini and ceramic methods

Kodaira¹,

Brito²,

Teotonio³

et al. 2004

J. Braz. Chem. Soc.

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“…The Sr 3 WO 6 :Eu 3+ phosphor was prepared by using conventional ceramic method [7,8]. The starting materials were SrCO 3 , WO 3 and Eu 2 O 3 .…”

Section: Methodsmentioning

confidence: 99%

“…Very extensive studies of the optical properties of double rare-earth molybdates and tungstates of the composition MRE(XO 4 ) 2 (M = Cs, K, Rb; RE=rare earth; X=Mo, W) were also reported [7]. Promising luminescence properties of Eu 2 (WO 4 ) 3 were well investigated by Kodaira et al [8]. Sr 2 ZnWO 6 has been widely studied mainly due to their unusual and interesting physical properties including ferroelectric, dielectric and magnetic properties, etc.…”

Section: Introductionmentioning

confidence: 97%

Synthesis, Characterization and Luminescence Properties οf Sr₃WO₆:Eu³⁺Phosphor

et al. 2012

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Sr 3 WO 6 :Eu 3+ phosphor was prepared at high temperature by solid state method. The phase structure of phosphor was characterized as double perovskite structure. The cell parameters of Sr 3 WO 6 :Eu 3+ were determined as a = 8.361 Å, b = 8.288 Å, c = 8.211 Å, α = β = γ = 89.78• . The luminescence properties were studied. The results revealed that Eu 3+ ions show red emission about 616 nm.

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“…[5h, 31] The emission spectrum of the Eu III Wells-Dawson exhibits four bands with strong intensities at 580, 593, 613 and 700 nm ( Figure 6). While the three latter are expected to be strong as they are associated with the 5 D 0 !…”

mentioning

confidence: 99%

Molecular Origin of the Hydrolytic Activity and Fixed Regioselectivity of a Zr^IV‐Substituted Polyoxotungstate as Artificial Protease

Stroobants¹,

Goovaerts²,

Absillis³

et al. 2014

Chemistry A European J

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A multitechnique approach has been applied in order to identify the thermodynamic and kinetic parameters related to the regioselective hydrolysis of human serum albumin (HSA) or Cys392ÀGlu393 peptide bonds. This is in agreement with the interaction studies as the Arg114ÀLeu115 peptide bond is located in the positive cleft of HSA and the three remaining peptide bonds are each located near an upstream acidic residue, which can be expected to coordinate to the metal ion. A detailed kinetic study has evidenced the formation of additional fragments upon prolonged reaction times. Edman degradation of the additional reaction products has shown that these fragments result from further hydrolysis at the initially observed cleavage positions, indicating a fixed selectivity for K 15 H[Zr(a 2 -P 2 W 17 O 61 ) 2 ].

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Luminescence and energy transfer of the europium (III) tungstate obtained via the Pechini method

Cited by 351 publications

References 36 publications

Photoluminescence behavior of the Sm3+ and Tb3+ ions doped into the Gd2(WO4)3 matrix prepared by the Pechini and ceramic methods

Photoluminescence behavior of the Sm3+ and Tb3+ ions doped into the Gd2(WO4)3 matrix prepared by the Pechini and ceramic methods

Synthesis, Characterization and Luminescence Properties οf Sr₃WO₆:Eu³⁺Phosphor

Molecular Origin of the Hydrolytic Activity and Fixed Regioselectivity of a Zr^IV‐Substituted Polyoxotungstate as Artificial Protease

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Luminescence and energy transfer of the europium (III) tungstate obtained via the Pechini method

Cited by 351 publications

References 36 publications

Photoluminescence behavior of the Sm3+ and Tb3+ ions doped into the Gd2(WO4)3 matrix prepared by the Pechini and ceramic methods

Photoluminescence behavior of the Sm3+ and Tb3+ ions doped into the Gd2(WO4)3 matrix prepared by the Pechini and ceramic methods

Synthesis, Characterization and Luminescence Properties οf Sr3WO6:Eu3+Phosphor

Molecular Origin of the Hydrolytic Activity and Fixed Regioselectivity of a ZrIV‐Substituted Polyoxotungstate as Artificial Protease

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Product

Resources

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Synthesis, Characterization and Luminescence Properties οf Sr₃WO₆:Eu³⁺Phosphor

Molecular Origin of the Hydrolytic Activity and Fixed Regioselectivity of a Zr^IV‐Substituted Polyoxotungstate as Artificial Protease