Synthesis and characterization of a new ethynyl‐linked alternating anthracene/fluorene copolymer for organic thin film transistor |
| |
| Authors: | Jin Uk Ju Dae Sung Chung Seul Ong Kim Sung Ouk Jung Chan Eon Park Yun‐Hi Kim Soon‐Ki Kwon |
| |
| Institution: | 1. School of Materials Science & Engineering and ERI, Gyeongsang National University, Jin‐ju 660‐701, Korea;2. Polymer Research Institute, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790‐784, Korea;3. Department of Chemistry and RINS, Gyeongsang National University, Jinju 660‐701, Korea |
| |
| Abstract: | A new p‐type conjugated copolymer, poly(9,10‐diethynylanthracene‐alt‐9,9‐didodecylfluorene) (PDADF), which is composed of ethynyl‐linked alternating anthracene/fluorene, is synthesized via a palladium(II)‐catalyzed Sonogashira coupling reaction with 9,10‐diethynylanthracene and 2,7‐diiodo‐9,9‐didodecyl‐fluorene. The obtained polymer is confirmed by FTIR, 1H‐NMR, 13C‐NMR and elemental analysis. The PDADF had very good solubility in organic solvents such as chloroform and had a weight average molecular weight of 29,300 with a polydispersity index of 1.29. The PL maximum of the polymer was found at 533 and 568 nm for a solution and 608 nm for film, respectively. The highest occupied molecular orbital (HOMO) energy of the polymer is ?5.62 eV as measured via cyclic voltammetry (CV). A solution‐processed thin film transistor device showed a carrier mobility value of 6.0 × 10?4 cm2/Vs with a threshold voltage of ?17 V and a capacitance (Ci) of 10 nF/cm2. The out‐of‐plane and in‐plane GIXD pattern of spin‐coated polymer on SiO2 dielectric surfaces showed an amorphous halo near 2θ = 20°. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 1609–1616, 2009 |
| |
| Keywords: | conjugated polymers fluorescence synthesis |
|
|
