Controllable Liquid Transfer for Preparing Oriented Polymer Thin Films： Toward the Enhanced Performance of PLED

doi:10.7503/cjcu20200478

Abstract

Abstract:

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 wetting and dewetting processes under directional stress， guiding the disorganized polymer transform into orientation. 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 electroluminescence compared with that of the spin-coating one. We envision that the as-developed approach offers new inspiration for fabricating high-performance polymer films.

Key words: Conical fiber, Conjugated polymer, Oriented organic thin film, Polymer light-emitting diode

CLC Number:

O647

TrendMD:

MENG Lili, CHEN Linlin, ZHANG Xiaoliang, XIE Linghai, LIU Huan. Controllable Liquid Transfer for Preparing Oriented Polymer Thin Films： Toward the Enhanced Performance of PLED[J]. Chem. J. Chinese Universities, 2021, 42(4): 1260.

Figures/Tables 4

Fig.1 Schematic illustrations of CFA?brushing process(A) and the chemical structure of the polymer PODPF(B), schematic illustration of transformation from the amorphous state to the β?phase(C) and PODPF film with higher orientations and larger crystallized sizes induced by the CFA(D)

Fig.2 Optical pictures of the as?brushed PODPF film based on amorphous and β?phase PODPF at various brushing speed, and that prepared by spin?coating(A), UV?Vis spectra of PODPF films with amorphous and β?phase PODPF(B) and the polarized UV?Vis absorption spectra of CFA?brushed and spin?coated PODPF films(C)

Fig.3 AFM images of the CFA?brushed PODPF films based on amorphous(A1—A5) and β?phase(B1—B5) PODPF at different brushing speed, AFM images of the spin?coated PODPF films based on amorphous(A6) and β?phase(B6) of PODPF, the film roughness of the CFA?brushed PODPF films at different brushing speed(C), representative AFM height image of the CFA?brushed PODPF films at the brushing speed of 800 μm/s(D) and effect of brushing speed on the film thickness(E)Brushing speed/(μm·s?1): (A1, B1) 300; (A2, B2) 500; (A3, B3) 800; (A4, B4) 1000; (A5, B5) 2000.

Fig.4 Schematic configuration of PLED device(A), brightness?voltage(B) and current effciency?voltage(C) plots for the PODPF devices prepared by both CFA?brushing and spin?coating methods, current density characteristics of the devices based on PODPF films(D), electroluminescence(EL) spectra of the CFA?brushed PLEDs with amorphous?phase PODPF(E) and β?conformation PODPF(F)

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