| In chapter one, the growth of zirconium bisphosphonate, titanium-oxide bisphosphonate, titanium-oxide dithiolate, and copper dithiolate multilayer thin films of various novel photoactive moieties on a variety of substrates is presented. Ellipsometry, and AFM evidenced their layer-by-layer lamellar growth. Gold electrodes modified with multilayers thin films of electron donors and acceptors resulted in a p-n heterojunction organic solar cell that produced stable photocurrent upon irradiation with light. By arranging the redox active moieties in an energetically favorable fashion, according to their redox potentials and optical band gaps, the photoinduced charge separation yields improved, hence improving the device performance.; In chapter two, the usage of colloidal metal (Pt and Pd) functionalized silica particles modified with Zr bisphosphonate multilayer films rich with catalytically active moieties, i.e., N, N′-bis(2-phosphonoethyl)-4,4 ′-bipyridinium dichloride and 2,6-Bis(4-phosphonobutyloxy)-anthraquinone for H2O2 production is reported. By utilizing the film activity for the catalytic formation of H2O2 from dissolved H2 and O2, we were able to study the uniformity of these films. The production of H2 by photolysis of silica-colloidal metal modified with multilayers of electron donor and acceptor moieties in the presence of sacrificial reductant in aqueous solution is presented.; In chapter three, the preparation, photophysics and electrochemical characteristics of octahedral Ir complexes and square planner Pt complexes are presented. These complexes consist of cyclometalated ligand(s) and a single bidentate, monoanionic ligand (acac). The emission spectra of these complexes are largely governed by the nature of the cyclometallating ligand. By chemical modification of the ligand framework and its conjugations, the luminescent properties of the complexes were tuned to cover the green to red portion of the visible spectrum. The strong spin-orbit coupling of Iridium and Platinum mixes the formally forbidden 3MLCT and 3π-π* transitions with the allowed 1MLCT, leading to strong phosphorescence with good quantum efficiencies (up to 0.25) and room temperature lifetimes in the microsecond regime (1–6 μS). The use of an example of these complexes as an efficient phosphorescent dye in small molecule based OLEDs is demonstrated. |
