Systematic investigation of self-organization behavior in supramolecular π-conjugated polymer for multi-color electroluminescence

Jin Yi Lin, Bin Liu, Meng Na Yu, Xu Hua Wang, Lu Bing Bai, Ya Min Han, Chang Jin Ou, Ling Hai Xie, Feng Liu, Wen Sai Zhu, Xin Wen Zhang, Hai Feng Ling, Paul N. Stavrinou, Jian Pu Wang, Donal D.C. Bradley, Wei Huang

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14 Scopus citations

Abstract

The nature of chain aggregation in solution always results in 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 interactions), although it is not fully understood how the interplay of these forces results in the observed conformational order, chain aggregates and film morphologies. Herein, we present a precise study on the role of non-covalent interaction in the self-organization behavior, conformational order and optoelectrical properties of polyfluorene (PPFOH) toward tuning its electroluminescence (EL). The supramolecular PPFOH system consisted of an intrinsically doped hydrogen-bond-assisted microstructure as a "guest" and a 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), a likely distorted or fold chain in rod-coil or branch cluster shows a narrow and strong aggregation emission at 525-540 nm. 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 evidence from nanoscale infrared (AFM-IR) analysis confirmed the stronger hydrogen-bonding interaction in the type II films than those in the type I films. Finally, supramolecular PPFOH electroluminescence colours can be tuned from blue to sky blue, green, white, yellow and orange.
Original languageEnglish (US)
JournalJournal of Materials Chemistry C
Volume6
Issue number6
DOIs
StatePublished - Jan 1 2018
Externally publishedYes

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