Luminescence investigation of the Sm(III)-β-diketonates with sulfoxides, phosphine oxides and amides ligands

Brito, Hermi F.; Malta, O.M.L.; Felinto, Maria Claudia França da Cunha; Teotonio, Ercules E.S.; Menezes, Jorge Fernando Silva de; Silva, C. F. B.; Tomiyama, Claudia Satiko; Carvalho, Carlos Alberto Alves de

doi:10.1016/s0925-8388(02)00372-9

Cited by 121 publications

(51 citation statements)

References 14 publications

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“…parameters with those for other RE 3+ -complexes it is observed that the chemical environment around the rare earth ions in the tungstate systems is less polarizable than in the [RE(TTA) 3 (PTSO) 2 ] complex. 24 In the present investigation, the excitation spectra of the Gd 2 (WO 4 ) 3 :Tb 3+ system prepared by the Pechini and ceramic methods were also obtained at 77 K in the spectral range from 250 to 520 nm, under emission at 544 nm ( Figure 3). The spectrum of the Tb 5d transitions from the terbium ion, respectively.…”

Section: Photoluminescence Investigationmentioning

confidence: 78%

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: 78%

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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“…Los complejos sólidos [RE(TTA)3(TPPO)2] (donde RE=Sm o Eu) fueron preparados por el método descrito en la Referencia [5], disolviendo los precursores hidratados [RE(TTA)3(H2O)2] y TPPO en solución etanólica en la razón molar 1:2 (complejo hidratado/TPPO). La solución fue entonces mezclada hasta que la precipitación del compuesto amarillo pálido estuviera completa.…”

Section: Methodsunclassified

“…No es posible detectar el H por la propia limitación de la técnica RBS para analizar elementos leves [4]. Sin embargo, la presencia de Sm, Eu, P, S y C, se muestra de acuerdo, en principio, con la fórmula empírica C60H42(RE)F9O8P2S3 [8], del complejo [RE(TTA)3(TPPO)2] (donde RE=Sm o Eu), por lo menos en lo que concierne a los elementos encontrados.…”

Section: +unclassified

ESTUDIO POR ESPECTROSCOPIA DE RETRODISPERSIÓN DE RUTHERFORD DE PELÍCULAS DELGADAS CON COMPLEJOS DE (Sm+Eu)

Reyes

Brito

Cremona

2017

TECNIA

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RESUMENEn este trabajo reportamos el uso de la espectroscopia de retrodispersión de Rutherford (RBS) para el análisis, búsqueda de contaminantes y medición del espesor de película delgadas de organo-lantánido [SmxEuy(TTA)3(TPPO)2] utilizadas como capas emisoras de luz en diodos orgánicos emisores de luz (OLEDs).También se hace un estudio de fotoluminiscencia de las películas de [SmxEuy(TTA)3(TPPO)2], y se encuentra que la emisión de luz de la mezcla se realiza independientemente por las moléculas [Sm(TTA)3(TPPO)2] y [Eu(TTA)3(TPPO)2], no observándose una transferencia intermolecular de energía entre dichas moléculas. Palabras clave: Samario, Europio, Fotoluminescencia, RBS, OLED ABSTRACTIn this work we report the use of Rutherford backscattering spectroscopy (RBS) for the analysis, search of contaminants and measurements of thickness of the organic-lanthanide [SmxEuy(TTA)3(TPPO)2] thin films used as light-emitting layer in organic light-emitting diodes (OLEDs). Also a study of photoluminescence of the films [SmxEuy(TTA)3(TPPO)2] is realized, and it is found that the emission of light of the mixture is carried out independently for the molecules [Sm(TTA)3(TPPO)2] and [Eu(TTA)3(TPPO)2], not being observed a intermolecular energy transfer between these molecules.

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“…The orange light was attained using the Sm 3+ ion [6], white con Dy 3+ [7], blue with Tm 3+ [8] and infrared emission was achieved with Er 3+ [9] and Yb 3+ [10], raising the interest on OLEDs devices for telecommunication applications. In contrast, the Gd 3+ ion has an energy gap between the 8 S7/2 ground state and first excited state 6 P7/2 at around 32000 cm -1 , and its complexes are used to study the energy of the triplet states T of the organic ligand [11].…”

Section: Introductionmentioning

confidence: 99%

Luminescent Eu3+–dibenzoylmethanate complex with sulfoxide ligand as sensitizer applied to organic light- emitting diodes

Reyes¹,

Niyama²,

Teotonio³

et al. 2017

Opt. Pura Apl.

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ABSTRACT:In this work the synthesis, characterization and photoluminescent and electroluminescent behavior of the [Eu(DBM)3(PTSO)2] complex have been investigated. The emission spectrum of this Eu 3+ -β-diketonate complex show characteristics narrow bands arising from the 5 D0→ 7 FJ (J = 0-4) transitions, which are split according to the selection rule for Cs, Cn or Cnv site symmetries. Triple and doublelayer organic light-emitting diodes (OLEDs) using NPB as hole transporting layer, Alq3 as electron transporting layer and [Eu(DBM)3(PTSO)2] complex as emitting and electron transporting layer were grown and characterized. We found the presence of two concurrent mechanisms for the electroluminescent behavior: (1) the electroluminescence (EL) from the exciton-ligand-Eu 3+ ion energy transfer, responsible for the EL narrow bands; and (2) the molecular electrophosphorescence with an initial energy transfer exciton-ligand and posterior intersystem crossing from the excited singlet S1 to the triplet T state followed by molecular phosphorescence (T→S0). The electroluminescent behavior of [Eu(DBM)3(PTSO)2] complex suggest that this complex is promising to applied at Light Conversion Molecular Devices (LCMDs) such as in OLED devices. [12] J.M. Lehn, "Perspectives in supramolecular chemistry-from molecular recognition towards molecular information processing and self-organization," Angew. Chem. Int. Ed. Engl. 29, 1304-1319 (1990) https://doi.org/10.1002/anie.199013041[13] E. Niyama, H.F. Brito, M. Cremona, E.E.S. Teotonio, R. Reyes, G.E.S. Brito, M.C.F.C. Felinto, "Synthesis and spectroscopic behavior of highly luminescent Eu 3+ -dibenzoylmethanate (DBM) complexes with sulfoxide ligands," Spectrochim. Acta Part A 61, 2643-2649 (2005).

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Luminescence investigation of the Sm(III)-β-diketonates with sulfoxides, phosphine oxides and amides ligands

Cited by 121 publications

References 14 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

ESTUDIO POR ESPECTROSCOPIA DE RETRODISPERSIÓN DE RUTHERFORD DE PELÍCULAS DELGADAS CON COMPLEJOS DE (Sm+Eu)

Luminescent Eu3+–dibenzoylmethanate complex with sulfoxide ligand as sensitizer applied to organic light- emitting diodes

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