| 초록 |
The remarkable features of Thiophene-based polymers are high chemical stability, bipolar behavior, its own emission of red-light, wide color tunability, possibility of full-plastic device. It makes possible the single-layer EL device. In order to develop organic electroluminescent device(OELD) of thiophene moiety with high performance, it is necessary to attain charge balance. Charge-carrier draft mobility of organic disordered systems takes place by a thermally activated hopping process. In addition, the draft mobility of molecularly doped polymer system is affected by the intersite distance of the charge-transporting molecules dispersed in polymer. In this study 3-octyl-thiophene(3OT) which shows film processability, can be doped into polymer binder, polystyrene. And then we applied some charge-carrier transport materials(CTM) to device. CTM are expected to increase charge-carrier draft mobility of 3OT by reducing band-gaps between polymers and both electrodes in single-layer. CTM have oxadiazole, cyano, and amine functional groups. And we used polyaniline. Photoluminescence and current-voltage-luminescence characteristics are investigated. We observed that thiophene peak is shifted and driving voltage is lowered by CTM.
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