Fluoranthene is a typical polycyclic aromatic hydrocarbon with highly planar structure. Its unique fivemembered ring core can endow fluoranthene with the electron-withdrawing character

making it quite suitable for constructing fused-ring imide type acceptor units. However

due to the limited functionalized sites

the fluoranthene-fused imides have not been successfully explored to construct the conjugated polymers. Herein

by taking advantage of an asymmetric 2

3-fluoranthene imide building block

two new donor-acceptor (D-A) type conjugated polymers have been successfully developed

i. e.

random PF1 and regioregular PF2

and their photophysical properties and organic field-effect transistor (OFET) performance have been investigated in detail. The results demonstrated that the regioregular structure can afford the more ordered aggregation and better film morphology

which help to deliver a hole mobility of 1.72×10

-5

cm

2

·V

-1

·s

-1

in OFET devices based on PF2 instead of the failure in detecting device performance of random PF1. This work not only confirms the potential of 2

3-fluoranthene-fused imide as the acceptor unit in designing new D-A type polymeric semiconductors

but also further proves the important roles of regioregularity in the molecular aggregation and the optoelectronic performance.