Add time:07/22/2019         Source:sciencedirect.com

New fluorescent polyimides, having an electroluminescent (EL) active unit, 2,5-distyrylpyrazine (DSP), were synthesized by the poly-condensation of 2,5-bis(4-aminostyryl)pyrazine 4 with various tetracarboxylic dianhydrides 5. Intense photoluminescence originating from the DSP chromophore units was demonstrated. Furthermore, a light emitting diode (LED) was fabricated based on the polyimide Langmuir-Blodgett film, using indium tin oxide and a Mg-Ag alloy as the anode and the cathode, respectively. Under forward bias, orange-red light emission (λmax = 560 nm) could be observed, which was similar to the emission generated by photoexcitation. Meanwhile the EL intensity linearly depended on the applied current density, which indicated that light emission resulted from recombination of the injected charges in the polyimide layer.

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