| 초록 |
In this article, we describe the synthesis and characterization of highly phenyl-substituted fluorene copolymer via Diels-Alder polymerization. The resulting polymer should have high purity because the polymerization is carried out in the transition metal-free thermal state. Additionally, high molecular weights as well as good soluble polymer are expected to be achieved because the retro Diels-Alder reaction should be prevented by the loss of carbon monoxide during the thermal polycondensation and due to the bulky phenyl groups, respectively. Highyl phenyl-substituted fluorene copolymer was synthesized by Diels-Alder polymerization of 2,7-diethynyl-9,9’-spirobifluorene and the corresponding bis(cyclopentadienone). The resulting polymer was readily soluble in common organic solvents and stable up to 430 ℃ under nitrogen. The absorption and PL peaks at 333 nm and 410 nm with a weak shoulder above 500 nm, respectively. The light-emitting diode with the device structure of ITO/PEDOT/Polymer/LiF/Al was fabricated to investigate the EL properties. The EL spectrum indicates that the polymer in the device was blue emission with maximum peak at 477 nm. The current-voltage characteristic of the polymer as well as EL property of blended polymer with PVK will be discussed.
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