Universität zu Köln

Moon, Chang‐Ki ORCID: 0000-0001-8286-5187, Butscher, Julian F. ORCID: 0000-0001-7204-1934 and Gather, Malte C. ORCID: 0000-0002-4857-5562 (2023). An Exciplex‐Based Light‐Emission Pathway for Solution‐State Electrochemiluminescent Devices. Advanced Materials, 35 (38). p. 2302544. Wiley. ISSN 0935-9648

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Abstract

Electrochemiluminescence (ECL) allows the design of unique light-emitting devices that use organic semiconductors in a liquid or gel state, which allows for simpler and more sustainable device fabrication and facilitates unconventional device form-factors. Compared to solid-state organic LEDs, ECL devices (ECLDs) have attracted less attention due to their currently much lower performance. ECLD operation is typically based on an annihilation pathway that involves electron transfer between reduced and oxidized luminophore species; the intermediate radical ions produced during annihilation dramatically reduce device stability. Here, the effects of radical ions are mitigated by an exciplex formation pathway and a remarkable improvement in luminance, luminous efficacy, and operational lifetime is demonstrated. Electron donor and acceptor molecules are dissolved at high concentrations and recombined as an exciplex upon their oxidization/reduction. The exciplex then transfers its energy to a nearby dye, allowing the dye to emit light without undergoing oxidation/reduction. Furthermore, the application of a mesoporous TiO2 electrode increases the contact area and hence the number of molecules participating in ECL , thereby obtaining devices with a very high luminance of 3790 cd m−2 and a 30-fold improved operational lifetime. This study paves the way for the development of ECLDs into highly versatile light sources.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Moon, Chang‐Ki UNSPECIFIED orcid.org/0000-0001-8286-5187 UNSPECIFIED Butscher, Julian F. UNSPECIFIED orcid.org/0000-0001-7204-1934 UNSPECIFIED Gather, Malte C. UNSPECIFIED orcid.org/0000-0002-4857-5562 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-715415
DOI:	10.1002/adma.202302544
Journal or Publication Title:	Advanced Materials
Volume:	35
Number:	38
Page Range:	p. 2302544
Date:	2023
Publisher:	Wiley
ISSN:	0935-9648
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	Chemistry and allied sciences
Funders:	Alexander von Humboldt Foundation (Humboldt-Professorship to M.C.G.), DFG-funded Research Training Group “Template-Designed Organic Electronics (TIDE)”,, Marie Skłodowska Curie individual fellowship (101029807), Beverly and Frank MacInnis via the University of St Andrew
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/71541