A new series of disubstituted polyacetylene derivatives that contain multi-fluorine atoms on the pendent phenyl ring have been synthesized and characterized. The results reveal a greater red-shift in UV-vis absorption and PL emission upon incorporating more fluorine atoms on the pendent phenyl ring. Among them, disubstituted polyacetylene with a difluorophenyl group (PDPA-2F) showed the highest luminescent efficiency. The device performance can be promoted by blending a holetransporting material TM-TPD into PDPA-2F as the active layer or by using a light-emitting copolymer in which PDPA-2F was copolymerized with a carbazole group (PDPA-2Fcab). A lightemitting diode of ITO/PEDOT/PDPA-2Fcab/Ca/Al revealed a maximum luminescence of 4230 cd · m-2 at 14 V and a maximum current efficiency of 3.37 cd · A-1 at 7 V.
- Conjugated polymers
- Light-emitting diodes