We demonstrated a facile solution process guided by the conical fibers array(CFA),based on which bulky polydiarylfluorene(PODPF)were oriented on substrate.After thermal annealing at ca.240℃,PODPF changed from the amorphous-phase to compact π-π stacking β-phase,leading to a PODPF film with higher orientations and larger crystallized sizes.It is proposed that the CFA enables finely controlling the wet-ting and dewetting processes under directional stress,guiding the disorganized polymer transform into orienta-tion.Using the as-prepared PODPF films as the active layer,a polymer light-emitting diodes(PLEDs)device was developed,which exhibited higher current efficiency of 1.53 cd/A(5.6 V)and more stable electrolumines-cence compared with that of the spin-coating one.We envision that the as-developed approach offers new inspi-ration for fabricating high-performance polymer films.
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