European Journal of Inorganic Chemistry p. 3644 - 3654 (2017)
Update date:2022-08-11
Topics:
Karimi Behzad, Sara
Amini, Mostafa M.
Ghanbari, Mohammad
Janghouri, Mohammad
Anzenbacher, Pavel
Ng, Seik Weng
Four new europium complexes were prepared by treating europium(III) trifluoro(thenoyl)acetonate trihydrate with new tridentate ligands, based on dipyrazolyltriazine and utilized as emitting materials in electroluminescent devices. The complexes were characterized by elemental analysis, FTIR spectroscopy, UV/Vis spectrophotometry, and 1H NMR spectroscopy. The coordinated ligands serve as light-harvesting chromophores in the complexes, with absorption maxima in the range 334–402 nm [ε = (8.9–81.4) × 103 m–1 cm–1]. The ligands efficiently sensitize europium luminescence, with maximum quantum-yield (QLEu) and observed lifetime (τobs) values of 34 % and 600 μs in the solid state and 35 % and 528 μs in toluene, respectively. The radiative lifetimes of Eu (5D0) are in the range 1170–1281 μs and the ligand-to-metal energy-transfer efficiency (ηsens) is in the range 71–92 % for those complexes in the solid state and in the range 68–97 % for those in solution. Additionally, organic light-emitting diodes (OLEDs), which exhibited pure red emission, were fabricated with europium(III) complexes. It is shown that by modifying the [Eu(tta)3·3H2O] molecule with ancillary ligands, one can tune and control its electroluminescence spectra, along with its electrical properties, such as the current/voltage characteristics of OLED devices based on [Eu(tta)3(L)]. The best OLED presented a maximum luminance of 3156 cd/m2 and a maximum efficiency of 0.7 cd/A at an applied voltage of 8 V.
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