| 초록 |
In this article, we describe the synthesis and characterization of highly phenyl-substituted fluorene copolymers via Diels-Alder polymerization. The resulting polymers should have high purity because the polymerization is carried out in the transition metal-free thermal state. Highyl phenyl-substituted fluorene copolymers were synthesized by Diels-Alder polymerization of 2,7-diethynyl-9,9-di-n-hexylfluorene and the corresponding bis(cyclopentadienones). The resulting polymers with high molecular weights were shown to be good solubility in chloroform, stable up to 400 ℃, highly luminescent, and also easily cast to give good thin-films. The UV-visible and photoluminescence (PL) spectra of the polymer I showed maximum peak at 316 nm and at 450 nm, respectively. The single-layered light-emitting diode of an Al/polymer I or polymer II/PVK (2:8) blend/ITO glass exhibited a threshold voltage of 8 V from the I-V curve. The electroluminescence (EL) devices based on polymer I and polymer II gave the emissive peaks at 436 nm and 404 nm, respectively. |
