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Controllable supramolecular chain aggregation through nano-steric hindrance functionalization for multi-color larger-area electroluminescence

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Abstract

Suppression of hierarchical chain aggregation in light-emitting π-conjugated polymers (LCPs) is significant for restraining long-wavelength emission and improving the device performance. Herein, for the inhibition of molecular aggregation and the enhancement of luminescence efficiency, a series of multi-dimensional nano-steric units were introduced into supramolecular polyfluorene (PPFOH) by copolymerization, with the aim of integrating the advantages of the nano-steric hindrance effect on molecular emission. The introduction of our nano-steric units can not only effectively disrupt interchain hydrogen-bonding interaction and aggregation but also allow for excellent self-assembly behavior to form zero (nanosphere) and one-dimensional nanowires, similar to DNA molecules. Moreover, the long-wavelength emission at 500–590 nm of PPFOH can be effectively suppressed upon increasing the size and dimension of nano-steric units. Furthermore, larger-area polymer light-emitting diodes (PLEDs) (4 × 4 cm) are fabricated with a tunable electroluminescence (EL) color from orange to yellow, green and blue. These results indicated that nano-steric-hindrance functionalization is a superior and convenient approach to inhibit the interchain aggregation, tune the self-assembly behavior and improve the optoelectronic properties of LCPs.

Graphical abstract: Controllable supramolecular chain aggregation through nano-steric hindrance functionalization for multi-color larger-area electroluminescence

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Publication details

The article was received on 27 Mar 2018, accepted on 03 Jun 2018 and first published on 07 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC01431K
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Controllable supramolecular chain aggregation through nano-steric hindrance functionalization for multi-color larger-area electroluminescence

    M. Xu, W. Wang, L. Bai, M. Yu, Y. Han, J. Lin, X. Zhang, H. Ling, Z. Lin, L. Huang, L. Xie, J. Zhao, J. Wang and W. Huang, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC01431K

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