A comparative study on the electroluminescence properties of some terbium b-diketonate complexes
نویسندگان
چکیده
By comparing the phosphorescence spectra of Gd(acac)3 (acac~acetylacetone), Gd(TFacac)3 (TFacac~ 1,1,1-trifluoroacetylacetone), the effects of fluorine replacement of hydrogen on the triplet state energy of the ligands were revealed. Fluorine can lower the triplet state energy of Hacac and make it more suitable for energy transfer towards the D4 state of terbium. Organic electroluminescent devices (OELDs) with the corresponding trivalent terbium complexes as emissive layers were fabricated. Triple-layer-type devices with a structure of glass substrate/ITO (indium tin oxide)/PVK [poly(N-vinylcarbazole)]/PVK : Tb complex: PBD [2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole]/PBD/Al exhibit bright green luminescence upon applying a dc voltage. The luminance of a device with Tb(TFacac)3phen (1,10-phenanthroline) and Tb(TFacac)3 as emissive layer is higher than that of the corresponding devices with Tb(acac)3(phen) and Tb(acac)3 as emissive layers. The EL device with Tb(TFacac)3(phen) as emitter exhibits characteristic emission of Tb 3z ions with a maximum luminance of 58 cd m at 25 V.
منابع مشابه
Solvatochromic Properties of Heteroleptic Copper(II) Complexes Containing N,N,N',N'-Tetramethylethylenediamine and 2-Aacetylcyclopentanone Ligands
Three new heteroleptic copper(II) complexes, [(tmen)Cu(dike)H2O]X where tmen = N,N,N',N'-tetramethylethylenediamine, dike = 2-acetylcyclopentanone anion and X= ClO4- (1), Cl- (2) and Br- (3) are prepared and characterized by elemental analyses, molar conductance measurements and IR and UV-Vis spectroscopy techniques. The complex 1 is fairly soluble in various organic solvents and demonstrates d...
متن کاملTetraethylammonium tetrakis(1,1,1,5,5,5-hexafluoroacetylacetonato)terbate(III)
The title compound, (C(8)H(20)N)[Tb(C(5)HF(6)O(2))(4)], is a tetrakis β-diketonate complex of hexa-fluoro-acetyl-acetone with terbium(III), and tetra-ethyl-ammonium as the counter-ion. This compound shows typical green terbium(III) luminescence upon excitation at about 335 nm. The coordination geometry around the Tb(III) atom is a slightly distorted square anti-prism. One hexa-fluoro-acetyl-ace...
متن کاملComparative analysis of conjugated alkynyl chromophore-triazacyclononane ligands for sensitized emission of europium and terbium.
A series of europium and terbium complexes based on a functionalized triazacyclononane carboxylate or phosphinate macrocyclic ligand is described. The influence of the anionic group, that is, carboxylate, methylphosphinate, or phenylphosphinate, on the photophysical properties was studied and rationalized on the basis of DFT calculated structures. The nature, number, and position of electron-do...
متن کاملA Comparative study of sport spaces in selected universities of the world
Nowadays, sport complexes are one of the most important parts of the universities that play a key role in improving the quality of studentschr('39') life and enhancing their desirable living standards, so that It is important to pay attention to the concept of forming these spaces throughout history and to suggest ways of promoting their position in universities and clarify their criteria and s...
متن کاملFaster Synthesis of Beta-Diketonate Ternary Europium Complexes: Elapsed Times & Reaction Yields
β-diketonates are customary bidentate ligands in highly luminescent ternary europium complexes, such as Eu(β-diketonate)3(L)2, where L stands for a nonionic ligand. Usually, the syntheses of these complexes start by adding, to an europium salt such as EuCl3(H2O)6, three equivalents of β-diketonate ligands to form the complexes Eu(β-diketonate)3(H2O)2. The nonionic ligands are subsequently added...
متن کامل