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

Abstract

In this paper we report on a photoluminescent investigation of complexes involving Sm-b-diketonates with sulfoxides, phosphine oxides and amides ligands. In the synthesis of the coordination compounds we used samarium tris(thenoyltrifluoroacetonate) dihydrated precursor with the following ligands (L): DBSO and PTSO sulfoxides; TPPO phosphine oxide and (PHA) N-phenylacetamide. They have 31 31 shown high orange luminescence characteristic of the Sm ion. The emission spectra of the Sm-complexes present narrow bands 4 6 4 6 arising from the G → H (J55 / 2, 7 / 2, 9 / 2, 11 / 2) transitions with the hypersensitive G → H transition as a prominent group. It 5 / 2 J 5 / 2 9 / 2 4 3 1 is observed an efficient intramolecular energy transfer from the triplet state (T) of the ligands to the emitting G state of the Sm ion. 5 / 2 The experimental intensity parameters (h and h) for the Sm and Eu complexes have been determined and compared. The lifetimes (t) Sm Eu 4 of the emitting level G of the Sm-complexes are approximately 10 times higher than in the precursor compound [Sm(TTA) ?(H O) ] 5 / 2 3 2 2 indicating that radiative processes are operative in all the compounds due to the absence of multiphonon relaxation by coupling with the OH oscillators.

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

“…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.…”

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

“…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.…”

“…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.…”

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

“…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].…”