Studies on the Synthesis and Optoelectronic Properties of Fluorene Polymer

• Main Authors: Ming-Hsiang Shin, 史銘翔
• Other Authors: Mou-Yung Yeh
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/06703763746547813928

博士 === 國立成功大學 === 化學系碩博士班 === 96 === Orangic lignt-emitting diodes (OLEDs) have recently attracted attention of their potential use in display technology, and then intrigued interests in both academic and industrial circles. However, polymer lignt-emitting diodes (PLED) have some aspects need further improvement. Recently many researchers have synthesized polymers containing isolated luminescent functional groups in order to improve color impurity arose from the effective length of conjugation. Poly(amide-imide)s and poly(ester-imide)s are well known as high- performance polymeric materials. Those modified polyimides not only improve processability and solubility, but also exhibit excellent thermal stability. In this study, we introduce fluorene into poly(amide-imide)s and poly(ester- imide)s at low temperature in polymerization. Trifluoromethyl group has also been introduced into targeted molecules to promote solubility. The properties of the synthesized polymers were tested. These polymers having intrinsic viscosity of 0.22~0.31g/dl . They were soluble in aprotic polar solvents such as NMP, DMF, DMSO. The polymers containing CF3 function group were more soluble in organic solvents. Under nitrogen atmosphere, these polymers loss 10％ of weight between 667~823K. The emittive wavelengths of these polymers in NMP are located at 425∼456 nm in the blue visible region. The cyclic voltammetric and optical investigations indicated that LUMO and HOMO level of the polymers are in the region of -4.47∼-4.37 eV and -7.56∼-7.12 eV. The wide-angle X-ray diffraction measurements showed that the polymers are amorphous. According to kinetic study, activation energy is dependent on conversion.