科研之友
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摘要
A series of novel light-emitting conjugated polymers based on fluorene and triarylpyrazoline were synthesized in good yields through Suzuki coupling reactions. The resulting polymers were characterized by NMR, FT-IR, elemental analysis, DSC, TGA and GPC. These polymers possess excellent thermal stability with glass transition temperatures (T-g) of 80 - 162 degreesC and onset decomposition temperatures (T-d) of 376 - 387 degreesC. Cyclic voltammetry studies revealed that these polymers have good hole and electron transporting properties with LUMO energy levels of -2.97 to -2.98 eV and HOMO energy levels of -5.71 to -5.81 eV. All the polymers emit green fluorescence with very high photoluminescence (PL) quantum yields of 45 - 59%. Polymer light-emitting diodes (PLEDs) with the configuration ITO/PEDOT/polymer/Ba/Al were fabricated. All these devices showed bright green emission peaking at 494 - 500 nm with high maximum external quantum efficiencies of 0.6 - 2.53% and low turn-on bias voltages. The good light-emitting properties indicate that these polymers are new and promising candidates for electroluminescent materials that can be used to fabricate efficient polymer light-emitting diodes.
