Synthesis And Properties Of POSS-based Organic/Inorganic Hybrid Photoelectric Materials

It is reported that the metal iridium(III) complexes as phosphorescent materials have the best external quantum efficiency however prone to self-quenching. Polyhedral Oligomeric Silsesquioxane(POSS) has well-defined nano-scale organic–inorganic structure, which attracts considerable interest in materials science. POSS is used as an ideal building block for constructing nano-structured hybrid materials and nanocomposites. Work in this paper is supported by the National Natural Science Foundation of China. Tow phosphorescent iridium complexes, Ir(1L)(Q-Allyl) and Ir(2L)(Q-Allyl) were synthesized by using 3-Phenyl-chromen-2-one(ligand 1L) and 2-(1-naphthyl)-benzothiazole(ligand 2L) as the primary ligand, respectively, and using 7-allyl-8-hydroxyquinoline as the second ligand. These complexes were characterized by 1H-NMR and the fluorescent properties were discussed. Three inorganic / organic hybrid materials, POSS-7(Cz-Propyl)-Ir(1L)(Q-Propyl),(POSS-1 for short), POSS-7(Cz-Propyl)-Ir(2L)(Q-Propyl),(POSS-2 for short) and POSS-6(Cz-Propyl)-2Ir(2L)(Q-Propyl),(POSS-3 for short) were obtained through making the two complexes grafted onto POSS core. The UV-vis absorption and photoluminescence of three compounds were discussed. They emit strong red light in the solid state.The organic semiconductor materials containing POSS core can reduce the self-quenching due to the three-dimensional spatial structure of POSS. Nano-composites containing POSS core have better thermal and mechanical properties and get excellent performance after be made devices. So we studied photoelectric materials containing POSS in this thesis.This thesis include four chapters. The first chapter introduces the basic theoretical knowledge of OLEDs. The second and third chapters discribe the research on synthesis and properties of some compounds such as HQ-Allyl ligand, two iridium complexes Ir(1L)(Q-Allyl), Ir(2L)(Q-Allyl) and three target products POSS-1, POSS-2, POSS-3, and the problems in the processes were discussed. The fourth chapter discribes the synthesis and properties of four coumarin derivatives.The purpose of this thesis is to synthesize and study inorganic-organic hybrid optoelectronic materials. The three novel hybrid phosphorescent materials based on POSS have good luminescent performance.