Spectroscopic characteristics of highly luminescent warm Sm³⁺ complexes for optical device applications

Six samarium complexes that radiated orange color, were synthesized with the chelation of organic sensitizer using solvent-assisted grinding method. The complexes were analyzed by various techniques elemental analysis, XRD, FTIR, NMR, UV–visible spectroscopy and photoluminescent spectra in solid and solution states respectively. The calorimetry aspects of the complexes in both states were also determined through the MATLAB software. FWHM values for the corresponding transition were assessed by the Gaussian fitting, which was used to compute the lasing properties. Optical properties and Urbach energy investigation have been done by the diffused reflectance spectra, which suggest that these complexes are good contenders for semiconductor devices. Judd-Ofelt parameter indicates that these complexes possess an asymmetric environment around samarium ion with covalent character and moderate rigidity. For justification of the optical band gap, computational study (HOMO-LUMO) difference was found by DFT calculation in ORCA software. Thermal stability and biological properties of the complexes were also determined.