Abstract
Highyl phenyl-substituted polyfluorenes 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 C, 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.
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