Judd-Ofelt, urbach energy and geometrical optimization study of orange light emitting samarium (III) complexes with heterocyclic ligands for application in optoelectronic devices

Abstract

Six luminescent samarium (III) complexes which include one binary and five ternary complexes were synthesized with 1-ethyl-6-fluoro-1,4-dihydroxy-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid (L) as main ligand and 5,6-dimethyl-1,10-phenanthroline, bathophenanthroline, neocuproine, 2,2′-bipyridyl, 1,10-phenanthroline as ancillary ligands, through environment friendly grinding method. These complexes were illustrated via UV–vis, elemental analysis, FTIR, 1H NMR and 13C NMR spectroscopy. Luminescent properties and lifetime were studied through PL spectroscopy. Absorption spectral data in NIR region is used for the calculation of Judd-Ofelt intensity parameters (Ωλ), radiative rate (Arad) and quantum efficiency (φ). Excellent thermal stability and CIE color coordinates in orange region indicates their promising use in display devices. Evaluation of optical band gap, refractive index and urbach energy indicates the application of these complexes in semiconductor and solar cell devices. Geometrical optimized structures were created using Avogadro software. Biological properties including antioxidant, antibacterial and antifungal behaviour were also assessed for these complexes.