Europium-based β-hydroxyketone complexes: synthesis, optoelectronic, thermal and computational analyses

Area of Science:

• Materials Science
• Inorganic Chemistry
• Optoelectronics

Background:

• Europium(III) complexes are investigated for their luminescent properties, crucial for display and optoelectronic technologies.
• Developing stable and efficient red-emitting materials is essential for advanced optical devices.

Purpose of the Study:

• To synthesize and characterize novel red-light-emitting Europium(III) complexes.
• To explore their potential applications in displays and optoelectronics.
• To investigate their photophysical, thermal, and biological properties.

Main Methods:

• Synthesis of six Eu(III) complexes featuring β-hydroxyketone ligands and heterocyclic ancillary ligands.
• Characterization using FTIR, NMR, XRD, SEM, EDS, TGA/DTG, and photoluminescence (PL) spectroscopy.
• Analysis of photophysical properties including Judd-Ofelt (J-O) parameters, bandgap, and Commission International de I'Eclairage (CIE) coordinates; computational studies using Density Functional Theory (DFT).

Main Results:

• Successfully synthesized and characterized pure, semicrystalline Eu(III) complexes with stable coordination.
• Complexes exhibit excellent thermal stability up to 200 °C and strong red emission originating from the ⁵D₀→⁷F₂ transition.
• Photophysical studies revealed semiconducting behavior (bandgap 2.54-3.02 eV) and Judd-Ofelt analysis indicated an asymmetric chemical environment around Eu(III).

Conclusions:

• The synthesized Eu(III) complexes are promising candidates for red-light emitters in display and optoelectronic applications due to their thermal stability and luminescent properties.
• Computational and experimental data showed good agreement, validating the structural and photophysical characteristics.
• Preliminary biological studies indicated potential antioxidant and antimicrobial activities.