Architecture of Conjugated Donor–Acceptor (D–A)‐Type Polymer Films with Cross‐Linked Structures

Abstract

A series of new donor–acceptor (D–A)‐type semiconducting conjugated polymers (SCPs), which can form cross‐linked structural and supramolecular assembly films by hydrogen‐bonding, is successfully synthesized. The microstructures of supramolecular assembly films are further investigated by X‐ray diffraction (XRD), high‐ resolution transmission electron microscopy (HRTEM), and variable‐temperature Fourier transform infrared (FT‐IR) absorption spectra. As electronic transmission (ET) materials, the SCPs demonstrate superior properties by means of fabricating electron‐only devices with the configuration of ITO/ET (SCPs)/Ca/Al. According to space‐charge‐limited current (SCLC) measurements, fluorine‐containing SCPs exhibit much smaller threshold voltages and much higher electron mobilities than Alq3. Meanwhile, a significant enhancement for their luminescence properties is verified by the photoluminescence (PL) and electroluminescent (EL) spectra of cross‐linked‐type SCPs, compared to non‐cross‐linked‐type SCPs. The fabricated polymer light‐emitting diodes (PLEDs) with the configuration of ITO/PEDOT:PSS/EML (SCPs)/BCP/LiF/Al are able to emit the color from green to red with moderately low turn‐on voltages. These results suggested that cross‐linked D–A‐type SCP can become a potential candidate as a kind of multifunctional materials applied in the field of optoelectronic devices.

Water-Soluble Fluorescent Nanobowls Constructed by Multiple Supramolecular Assembly

“…There are two strong characteristic peaks located at 1697 and 1737 cm −1 (the inset in Figure S9), which were attributed to the abundant carbonyl groups of the PAA segment. 18 When the CPNBs-311T sample was heated from 25 to 100 °C, the absorption intensities of the two characteristic peaks were slightly decreased and shifted to a higher wavenumber. The result indicates that the hydrogen bonding interactions exist in the assembling system and can be weakened at higher temperatures.…”

“…As the supramolecular assembly structures can effectively overcome the attenuation of physical properties caused by the excessive aggregation of CPs. , Conventionally, CPs can be ordered into a wide range of assembly nanostructures, such as sphere, lamellae, rod, and belt . The driving forces for the construction of supramolecular assembly structures from CPs involve hydrophobic interactions, − hydrogen bonding, − and π–π stacking . Because of their extremely rigid molecular backbones and π-conjugated systems, CPs are difficult to dissolve in most nonorganic solvents as a result of curling into Pdots with the size of dozens of nanometers (general less than 50 nm).…”

Synthesis and Solution Processing of a Hydrogen-Bonded Ladder Polymer

“…[24][25][26][27] It is crucial to manipulate both the intermolecular interactions (noncovalent bonds) and the macromolecular characteristics (rigid ladder-type backbone) to precisely control the properties and functions of ladder polymers. 28 In the context of this challenge, hydrogen bonds have been recognized as an ideal tool for shaping the properties of conjugated systems [29][30][31][32][33][34][35][36] because they demonstrate profound impacts on the charge transport, mechanical strength, and filmforming properties of these materials. Therefore, the incorporation of well-defined hydrogen bonds into ladder polymer backbones promises advancement in terms of both fundamental investigation of the structure-property relationship and practical exploration for electronic or mechanical performances.…”

Water molecular bridge-induced selective dual polarization in crystals for stable multi-emitters

“…In crystals or solid films, external stimuli, like an electronic field, polarized/circular polarized light, magnetic control, or an additional energy source, are usually employed for polarizing molecules and tuning their corresponding photophysical properties. 6 Developing internal chemical polarization approaches that are smart and low cost remains challenging, but they are desirable for achieving stable and distinct molecular photophysical properties.…”