Improved emission of Eu3+ by energy transfer via Tb3+ in coprecipitates TbxEu(1-x)(aspirin)3(phen) -: art. no. 063503

In order to increase the red emission of Eu complex doped in poly(N-vinylcarbazole) (PVK), series of molar ratio coprecipitates [TbxEu(1-x)(aspirin)(3)(phen)center dot H2O] (phen=1,10-phenanthroline) were prepared, in which Tb3+ ion acts as an energy bridge to enhance the energy transfer between the ligands and europium ion. The intramolecular energy transfer from Tb3+ to Eu3+ was studied via a time-resolved spectrum. It gave a direct evidence of the intramolecular energy transfer between the two lanthanide ions of terbium and europium. The photoluminescence and electroluminescence spectra as well as the performance of the device indium tin oxide/poly-(3,4-ethylenedioxythiophene):poly-(styrenesulphonic acid)/PVK:TbxEu(1-x)(aspirin)(3)(phen)/Al were also studied. Compared with that of PVK:Eu(aspirin)(3)phen device, the result showed an enhanced emission of Eu3+ ion due to the energy transfer via Tb3+ ion.