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Optical properties of red, green and blue emitting rare earth benzenetricarboxylate compounds

Rezende Souza, Ernesto ; Silva, Ivan G.N. ; Teotonio, Ercules E.S. ; Felinto, Maria C.F.C. ; Brito, Hermi F.

Journal of luminescence, 2010-02, Vol.130 (2), p.283-291 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    Optical properties of red, green and blue emitting rare earth benzenetricarboxylate compounds
  • Autor: Rezende Souza, Ernesto ; Silva, Ivan G.N. ; Teotonio, Ercules E.S. ; Felinto, Maria C.F.C. ; Brito, Hermi F.
  • Assuntos: Benzenetricarboxylate ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Exact sciences and technology ; Intramolecular energy ; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation ; Photoluminescence ; Physics ; Rare earths ; Solid organic materials
  • É parte de: Journal of luminescence, 2010-02, Vol.130 (2), p.283-291
  • Descrição: Red, blue and green emitting rare earth compounds (RE 3+=Eu 3+, Gd 3+ and Tb 3+) containing the benzenetricarboxylate ligands (BTC) [hemimellitic (EMA), trimellitic (TLA) and trimesic (TMA)] were synthesized and characterized by elemental analysis, complexometric titration, X-ray diffraction patterns, thermogravimetric analysis and infrared spectroscopy. The complexes presented the following formula: [RE(EMA)(H 2O) 2], [RE(TLA)(H 2O) 4] and [RE(TMA)(H 2O) 6], except for Tb-TMA compound, which was obtained only as anhydrous. Phosphorescence data of Gd 3+-(BTC) complexes showed that the triplet states (T) of the BTC 3− anions have energy higher than the main emitting states of the Eu 3+ ( 5D 0) and Tb 3+ ( 5D 4), indicating that BTC ligands can act as intramolecular energy donors for these metal ions. The high values of experimental intensity parameters ( Ω 2) of Eu 3+-(BTC) complexes indicate that the europium ion is in a highly polarizable chemical environment. Based on the luminescence spectra, the energy transfer from the T state of BTC ligands to the excited 5D 0 and 5D 4 levels of the Eu 3+ and Tb 3+ ions is discussed. The emission quantum efficiencies ( η) of the 5D 0 emitting level of the Eu 3+ ion have been also determined. In the case of the Tb 3+ ion, the photoluminescence data show the high emission intensity of the characteristic transitions 5D 4→ 7F J ( J=0–6), indicating that the BTC ligands are good sensitizers. The RE 3+-(BTC) complexes act as efficient light conversion molecular devices (LCMDs) and can be used as tricolor luminescent materials.
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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