Structural and photophysical investigations of thermally stable Dy (III) ion complexes incorporated with β-ketocarboxylate and ancillary moieties

Abstract

A series of five dysprosium complexes are synthesized, comprising four ternary and one binary complex with the primary ligand 9,10-Difluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido [1,2,3-de]-1,4-benzoxazine-6-carboxylic acid (L) and four ancillary ligands: 1,10-phenanthroline, 4,4′-dimethyl-2,2′-bipyridyl, neocuproine, and 2,2′-bipyridyl. Evaluation of elemental composition of complexes is done via elemental analysis. In contrast, the NMR, FT-IR, UV–visible absorption spectra are used to detect the bonding of the metal center with the primary and the secondary sensitizer. The photoluminescent properties of the formed complex are computed by exciting the complex at 355 nm which reveals the white emanating color of the complex which is attributable to the perfect balance of blue and yellow emission of the complex obtained at 485 nm and 576 nm respectively. The applicability of complexes in wide-gap semiconducting materials are demonstrated by analyzing the photophysical characteristics including optical band gap, diffuse reflectance spectra and refractive index which point towards their promising application in the field of solar devices and military radars. The color coordinates indicate consistency with the coordinates of white light specified by "The National Television System Committee". Their utilization in WOLEDs is validated by considering Correlated Color Temperature, color purity and the Commission International de I’Eclairage 1931 (CIE) color coordinates.