Pallei, Ajit Kumar (2014) Design and synthesis of new multifunctional europium molecular complex for oleds. MSc thesis.
Lanthanide based OLEDs are gained much importance due to their line like emission characteristics (f-f electronic transition) as well as phosphorescent visible range emission (IQE up to 100%). Most of the hole transporting materials reported are derived from aromatic amines, where the inclusion of arylamine units into the antenna should improve the hole injection/transporting properties of the EuIII-phosphors. The present research work aim is to increase the internal quantum efficiency by using chromophore (fluorene) molecule in order to improve the ð-ð* transition in the antenna and facilitate the energy transfer to europium ion, to link multi-functional ligands (TPA-DPA/ Fluorene and phenanthroline) that should be active as well as capable of charge transport. To fulfil this, a new efficient red emitting europium(III) molecular complex having neutral ligand [Eu(TTA)3 (Phen-Fl-TPA-DPA) - Eu(TTA)3 = Tris (thenoyltrifluoroacetone) Europium (III), Phen-Fl-TPA-DPA = N1-(4-(diphenylamino)phenyl)-N1-(4-(1-(9,9-diethyl-9H-fluoren-2-yl)-1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)phenyl)-N4,N4-diphenylbenzene-1,4-diamine) has been designed. The same has been successfully synthesised and optically characterised. The photophysical studies of the synthesized Ligand (Phen-FL-TPA-DPA) and Eu-complex have been carried out in the solution form by UV-Vis spectroscopy and spectrofluorimetry. The photoluminescence emission spectra of Eu(TTA)3Phen-FL-TPA-DPA exhibits 5D0-7FJ (J=0-4) transitions of Eu(III) ion. The characteristic emission observed at 612 nm due to 5D0-7F2 electric-dipole transition (non-centrosymmetric site). The thermogravimetric analysis (TGA) shows that the compound is thermally stable (278oC (10%)) and it is good enough to fabricate the OLED device using the synthesised Eu(III)-complex.
|Item Type:||Thesis ( MSc)|
|Uncontrolled Keywords:||TPA-DPA, Fluorene, 1,10-Phenanthroline, ð-ð* transition|
|Subjects:||Chemistry > Inorganic Chemistry|
|Divisions:||Sciences > Department of Chemistry|
|Deposited By:||Hemanta Biswal|
|Deposited On:||25 Aug 2014 16:05|
|Last Modified:||25 Aug 2014 16:05|
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