The Novel carbazole-based Polyimide as The Hole Transporting Material for Optoelectronic Application.
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We report a novel potential hole transporting material based on polyimide comprising of carbazole and arylamine moieties. 4,4'-(9H,9'H-[3,3'-bicarbazole]-9,9'-diyl)dianiline is the electron-rich molecule, which is the notable one of the prerequisites for an electrochromic behavior. From this monomer, electrochromic PI is prepared via the chemical imidization process. The structure and properties of PI are investigated by physic-chemical measurements. This polyimide exhibits not only the high-performance properties of typical PI: excellent thermal stability (Td＞ 500oC); a high refractive index of 1.74; reasonable stable transparency of 85%, but also characterizes of an electrochromic material: shallow highest occupied molecular orbital (HOMO) level of -5.4 eV, and hole mobility of 7.44 x 10-4 cm2V-1s-1.