Summary

· Expertise in steady-state and time-resolved (ms - fs time range) techniques used to probe molecular, electronic and level structure based on transitions between ground and photoexcited states and dynamics during the excited state lifetime.

· Expertise in electric field modulation spectroscopy to examine Stark shifts, charge separation and excited state dynamics of organic/LED fluorophores and Quantum dots (Nanoparticles).

· Experience in using commercial packages: Igor software for the simulation and analyzing the observed data.

· Hand’s on experience with various optical and electric instruments, designed and performed experiments on thin solid film at high electric field (~1 MV cm^-1).

· Experience; simultaneous electric and magnetic field effects, e.g., on light emitting diode polymers and other organic molecules doped in thin films.

Key achievements

· Stark effects and charge separation in capped CdS quantum dots (Nanoparticle) embedded in a polymer film of PMMA.

· Direct observation of field-induced changes in OLEDs, materials, e.g, in conjugated polymers, polyfluorene and poly(phenylene vinylene), PPV derivatives and metal complexes.

· Electric field-induced enhancement/quenching of photoluminescence of p-conjugated polymer S3-PPV.

· Ultrafast proton relay (within 200 ps) along molecular wire formed between 6-hydroxyquinoline and AcOH complex following photoexcitation.

· Electric and magnetic field effects on OLEDs materials Tris(8-hydroxyquinoline) aluminium complex (Alq₃): Stark effects and fluorescence quenching.

· Field-induced changes in optical transitions of capped CdS quantum dots (nanoparticles).

· Examined changes in electric dipole moment and molecular polarizability associated with optical transitions following photoexcitation in several choromophores.

· Proposed models for the excited state proton relay assisted by solvents molecules in hydroxyquinolines.

· Controlled molecular motion/reorientation effects and Stark effects in hydroxyquinolines derivatives.

· Proposed a model for the proton-transfer-reaction in photoexcited electronic states of hydroxyquinoline assisted by polymer chain.

· Study of various quinoline derivatives with a view to their applications as an optical sensor, lasing materials and molecular wire.