Materials, Methods & Technologies, Volume 11, 2017

Abstract: Three structurally different, highly luminescent Eu3+ complexes – tris complex Eu(2AID)3(H2O), ternary complex Eu(2AID)3(PHEN) and tetrakis complex [Eu(2AID)4]N(Et)4, where 2AID stands for 2-acetyl-1,3-indandione and PHEN for 1,10-phenantroline, were obtained and characterized with element analysis,1H-NMR, FT-IR andmass spectroscopy. Thermal properties were investigated with thermogravimetric analysis and it was shown, that independently from their structure all three complexes exhibit high thermal stability over 280 ℃. Photophysical properties were investigated in THF solutions, solid-state and poly-N-vinylcarbazole (PVK) films with complex mass of 8%. Complexes exhibit identical UV/Vis absorption and excitation spectra from 250-400 nm in THF, but in solid-state excitation window is shifted to near UV and even visible light region (300-500 nm). In solutions all three complexes exhibit weak emission at 613 nm with low absolute quantum yields (2-3%), but in solid state emission is enhanced and highest quantum yield – 34% was obtained for tetrakis complex. PVK films showed low PLQY.