Synthesis and Characteristics of Organic Light Emitting Materials Based on 1,3,4-Oxadiazole
|Keywords:||1,3,4-氧二氮呃;二極性之電致變色材料;1,3,4,-oxadiazole;bipolar electrochromic material||Issue Date:||2006||Abstract:||
We have synthesized a novel series of organic light emitting materials which contained 1,3,4-oxadiazole (OXD) in small molecules and polymers. We introduced 9,9’-spirobifluorene group into the structure to increase the efficiency in photophysics and thermal stability. Especially multifunctionalized dendrimers with carbazole (CBZ) and 1,3,4-oxadiazole exhibit some interesting phenomenons in the nuclear magnetic resonance spectrum. A novel 9,9’-spirobifluorene-cored donor-acceptor (D-A) bichromophore system has been synthesized, where the electron-donating (D) moieties are triphenylamine (TPA) groups and carbazole group, and the electron-withdrawing (A) moieties are 1,3,4-oxadiazole groups which can impede electronic interactions between the TPAs, consequently allow to undergo efficient electropolymerization processes. The polymer film obtained showed reversible electrochemical oxidation accompanied by strong color changes with high coloration efficiency and contrast ratio, which can be switched by potential modulation. In another direction, polymers based on 1,3,4-oxadiazole polymer and bisphenol A were synthesized and found to exhibit good solubility and optical properties. In addition, we prepared bipolar polymer with 1,3,4-oxadiazole as electron transporting material in the backbone with carbazole branching as the hole transporting units. The methodology developed can allow as to adjust the electron and hole proportion.
|Appears in Collections:||化學系|
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