Abstract
Luminescent chiral europium(III) complexes EuLRCl3 (1) and EuLSCl3 (2) were synthesised [where LR and LS are schiff-base ligands of 2,9-dialdehyde 1,10-phenanthroline and (R) and (S) isomer of 2-amino-3-phenylpropanol]. These europium complexes depicting intense “red luminescence” upon incorporating them in polyvinyl alcohol (PVA) matrices a series of transparent, flexible thin films were fabricated. These complexes 1, 2 and the films 1a-1c, 2a-2c were investigated for their photophysical properties such as radiative (ARAD) and non-radiative (ANR) decay rates, lifetimes (τobs), radiative lifetime (τRAD), intrinsic quantum yield (ΦLn), energy transfer efficiencies (Φsen) and total quantum yields (Φoverall). This PVA material at higher concentration demonstrates an interesting LRET (Luminescence Resonance Energy Transfer) behaviour. Based on the detailed investigation of the photo-luminescent properties, a plausible mechanism was proposed for energy transfer process.
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