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Beyond traditional light-emitting electrochemical cells – a review of new device designs and emitters

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Abstract

In the field of solid-state lighting (SSL) technologies, light-emitting electrochemical cells (LECs) are the leading example of easy-to-fabricate and simple-architecture devices. The key-aspect of this technology is the use of a single active layer that consists of a mixture of an emitter and an ionic polyelectrolyte. The presence of mobile anions efficiently assists both charge injection and charge transport processes using air-stable electrodes. This concept reported in the mid-90s was considered as a game-changer approach, leading to a new field in SSL. Since then, the evolution of the LEC technology has involved different stages, namely (i) the search for the best combination of emitters (luminescent conjugated polymers and ionic transition complexes) and additives (ionic polyelectrolytes, ionic liquids, and neutral polymers), (ii) the understanding of the device mechanism using several techniques like electrostatic force microscopy (EFM), microcavity effects, scanning Kelvin probe microscopy (SKPM), time-of-flight secondary ion mass spectroscopy (ToF-SIMS), electrochemical impedance spectroscopy (EIS), etc., (iii) the development of simple and up-scalable device fabrication processes and, recently, (iv) the quest for new emitters like copper(I) complexes, small-molecules, quantum dots, and perovskites. This review provides a general overview of the first three points and, in particular, an in-depth revision of the recent advances in designing new architectures and emitters for LECs.

Graphical abstract: Beyond traditional light-emitting electrochemical cells – a review of new device designs and emitters

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Publication details

The article was received on 13 Jan 2017, accepted on 23 Mar 2017 and first published on 20 Apr 2017


Article type: Review Article
DOI: 10.1039/C7TC00202E
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Beyond traditional light-emitting electrochemical cells – a review of new device designs and emitters

    E. Fresta and R. D. Costa, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC00202E

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