Speaker: Ms. Humera Baig Supervisor: Dr. Rahman Shah Zaib Saleem Student(s): Humera Baig
In the rapidly evolving field of organic electronics, there is an increasing drive to replace traditional inorganic silicon-based semiconductors with cost-effective organic materials that offer comparatively simpler and commercially viable technologies. Organic semiconducting materials exhibit unique qualities, such as low cost, lightweight, high photochemical stability, ease of synthetic modification and reversible redox properties, and compatibility with flexible substrates. These attributes make them ideal for applications such as organic photovoltaic cells (OPVs), organic light-emitting diodes (OLEDs), organic field-effect transistors (OFETs), and bio-imaging technologies. Among these materials, small molecular weight organic semiconductors (OSMs) have gained particular attention due to their reproducible synthesis, tunable molecular structures, enhanced charge carrier mobility, ordered molecular arrangement, and excellent solution processability compared to conjugated polymers.
In this thesis, novel imidazolone- and chalcone-based organic semiconductors were synthesized and systematically investigated through photophysical, electrochemical, and computational studies. Two new 2-aminoimidazolone derivatives, imidazoLUMS1 and imidazoLUMS2, based on donor–π–acceptor (D–π–A) and donor–π–π–acceptor (D–π–π–A) architectures, were synthesized using multicomponent reactions followed by Suzuki coupling and Knoevenagel condensation reactions. These compounds were designed to promote efficient intramolecular charge transfer (ICT) from the donor imidazolone core to the cyanoacetic acid acceptor unit. The synthesized derivatives exhibited absorption and emission maxima in the visible region, large Stokes shifts, and narrow HOMO–LUMO band gaps, confirming their strong ICT character and potential for optoelectronic applications.
Additionally, two series of chalcone derivatives with donor–acceptor–donor (D–A–D) and donor–acceptor–donor–acceptor (D–A–D–A) configurations were synthesized via nucleophilic aromatic substitution and Claisen–Schmidt condensation reactions. Various donor substituents, including dimethylamino, diethylamino, piperidine, and pyrrolidine groups, were incorporated to study their effects on optical and electronic properties. The resulting compounds displayed strong visible-region absorption and emission, large Stokes shifts (>100 nm), low HOMO–LUMO band gaps (
03
Jun
Date: June 03, 2026
Time: 04:00 PM
Location: SBASSE Dean's Smart Lab
Speaker: Ms. Humera Baig
Supervisor: Dr. Rahman Shah Zaib Saleem
Student(s): Humera Baig