Luminescent Eu3+ dibenzoylmethanate complex with sulfoxide ligand as sensitizer applied to organic light- emitting diodes Image Correlation for the measurement of 3D displacements and strains
R. Reyes, E. Niyama, E.E.S. Teotonio, H.F. Brito, M. Cremona
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Base Information
Volume
V50 - N2 / 2017 Ordinario
Reference
135-143
DOI
http://doi.org/10.7149/OPA.50.2.49012
Language
English
Keywords
Europium; Photoluminescence; Electroluminescence; Electrophosphorescence; OLED
Abstract
In this work the synthesis, characterization and photoluminescent and electroluminescent behavior ofthe [Eu(DBM)3(PTSO)2] complex have been investigated. The emission spectrum of this Eu3+-β-diketonate complex show characteristics narrow bands arising from the 5D0->7FJ (J = 0-4) transitions,which are split according to the selection rule for Cs, Cn or Cnv site symmetries. Triple and double-layer 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-Eu3+ 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.
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