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Amphiphilic Conjugated Molecules with Multifunctional Properties as Efficient Blue Emitters and Cathode Interlayers for Inkjet Printed Organic Light-Emitting Diodes

Abstract

A novel set of amphiphilic conjugated molecules consisting of highly emissive fluorene and pyrene species functionalized with phosphonate polar pendant groups, namely PEP and POEP, were designed and synthesized. The novel molecular design endows the resulting molecules with good solution processability, excellent thermal stability, and multifunctional optoelectronic properties, i.e. bright blue emission in films and efficient interfacial functionality, which contributes to effectively lowering the electron injection barriers for efficient electron injection from the cathode. As a result, with using the multifunctional amphiphilic conjugated molecules as both the light emitters and cathode interlayers, inkjet-printed single-layer organic light-emitting diodes (OLEDs) with the configuration of ITO/PEDOT:PSS/PEP or POEP/Al have been successfully constructed. Comparable or even superior device characteristics have been achieved in comparison with those of the spin-cast devices. Particularly, the inkjet printed devices based on PEP exhibited a low turn-on voltage (Von) of 3.8 V, a maximum current efficiency (ηc,max) of 1.12 cd A−1 at 10.0 V (687.2 mA cm-2), and a high maximum brightness (Lmax) of 8850.1 cd m-2 at 11.0 V. According to the results, such a novel molecular design is beneficial for achieving high-performance inkjet-printed OLEDs with simplified device architecture, which can strive for tackling the hurdle of conventional multilayer devices with high work-function electrodes.

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Publication details

The article was received on 14 Apr 2017, accepted on 09 Jun 2017 and first published on 09 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01632H
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Amphiphilic Conjugated Molecules with Multifunctional Properties as Efficient Blue Emitters and Cathode Interlayers for Inkjet Printed Organic Light-Emitting Diodes

    M. Wang, L. Zhou, M. Yu, C. Liu, S. Chu, J. Pan, W. Lai and W. Huang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01632H

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