Synthesis And Luminescence Properties Of Functionalized Polybenzimidazole Containing 8-hydroxyquinoline/β-diketone Side Group And Their Polymeric Complexes

So far, organic electroluminescence material (OELM) can be divided into three kinds: organic micromolecule compounds, micromolecule metal complexes andÏ€-conjugated polymers. Micromolecule complexes have many fascinating advantages, such as high luminescence efficiency, better brightness purity and carrier mobility, however there are also some problems including fluorescence degeneration, lower quantum efficiency, especially the tendency of recrystallization in the work process of device lead to decline of device's stability and life.Ï€-conjugated polymers possess many advantages over inorganic and organic micromolecule metal complexes, such as good thermal stability, processability and easy film-forming. How to combine with the advantages of these OELM in the way of chemical in order to synthesis ideal organic electroluminescence material is our object and direction in this research work. Combined metal complexes withÏ€-conjugated polymer by chemical bonds to gain the novel polymeric complexes which these OELM's glass-transition temperature (Tg), the stability of EL devices, performance life and mechanical properties have been improved, which provide the new direction of OLED's development.In this paper, two series of polymeric complexes were designed and synthesized, and their luminescence and thermal properties were also studied:1.Functionalized polybenzimidazole containing 8-hydroxyquinoline andβ-diketoneside group were synthesized by using NaH as deprotonation reagent, and characterized by FT-IR, ¹H NMR.2.Five polymeric complexes of Cu(â…¡), Zn(â…¡) and Al(â…¢) with functionalized polybenzimidazole containing 8-hydroxyquinoline side group were synthesized and characterized. From the results of excitation and emission spectra, all products emit blue-violet light in solution and blue/green light in solid, which are attributable to metal perturbation ligand. The difference of luminescence properties between different metal polymeric were compared and studied. Thermal properties measurement and analysis shows that they have good thermal stabilities.3.Four polymeric complexes of Dy³⁺ and Gd³⁺ with functionalized polybenzimidazole containingβ-diketone side group were synthesized and characterized. From the results of excitation and emission spectra, the Dy complexes emit blue and yellow characteristic emissions locating at around 484 and 575 nm which are attributable to the characteristic ⁴F_9/2→⁶H_J (J=15/2, 13/2) transition of Dy³⁺ and ligand perturbation rare erath, and Gd3+ ions have no characteristic emission. Thermal properties measurement and analysis shows that they have good thermal stabilities.