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Systematic Investigation of Self-Organization Behavior in Supramolecular π-Conjugated Polymer for Multi-color Electroluminescence

Abstract

The nature of the chain aggregation in solution always results into variable spin-coated film mesoscale morphology and uncontrollable device performance. The abundant variety and increasing chemical complexity of conjugated polymers induced additional diverse electrostatic and dispersion interactions (non-covalent interaction), although it is not fully understood how the interplay of these forces results in observed conformational order, chain aggregates and film morphologies. Herein, we present a precise study on the role of non-covalent interaction in self-organization behavior, conformational order and optoelectrical property of polyfluorene (PPFOH) toward tuning their electroluminescence (EL). Supramolecular PPFOH system consisted of a intrinsically doped hydrogen-bond-assisted microstructures as a “guest” and blue light-emitting backbone chain as a “host”, which show a special binary emissive property of solution-induced self-dopant formation in the amorphous films. As a result of a strong non-covalent interaction between polymer chains and solvent molecules (type II solvent), likely distorted or fold chain in rod-coil or branch cluster show a narrow and strong aggregation emission at 525~540 nm. And low-polar solvents (called type I) can also induce a shoulder low-energy emission at 550~580 nm in the films, attributed to the extended and stretched chain complex for the tendency of interchain hydrogen-bonding interaction. Further evidences from nanoscale infrared (AFM-IR) analysis confirmed the stronger hydrogen-bonding interaction in the type II films than those in type I films. Finally, supramolecular PPFOH electroluminescence colours can tune from blue, sky blue, green, white, yellow to orange.

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Supplementary files

Publication details

The article was received on 23 Oct 2017, accepted on 10 Jan 2018 and first published on 11 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC04833E
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Systematic Investigation of Self-Organization Behavior in Supramolecular π-Conjugated Polymer for Multi-color Electroluminescence

    J. Lin, B. Liu, M. Yu, X. Wang, L. Bai, Y. Han, C. Ou, L. Xie, F. Liu, W. Zhu, X. Zhang, H. Ling, P. N. Stavrinou, J. Wang, D. Bradley and W. Huang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC04833E

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