Year

2015

Type(s)

Journal Article

Author(s)

Data, P. and Swist, A. and Lapkowski, M. and Soloducho, J. and Darowicki, K. and Monkman, A.P.

Source

Electrochimica Acta, 184: 86—93, 2015

Url

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84944755119&doi=10.1016%2fj.electacta.2015.10.047&partnerID=40&md5=18b2c2e8e5734469ff7d4bfc67040d5e

BibTeX

BibTeX

BibTeX

@ARTICLE{Data201586, author={Data, P. and Swist, A. and Lapkowski, M. and Soloducho, J. and Darowicki, K. and Monkman, A.P.}, title={Evidence for Solid State Electrochemical Degradation Within a Small Molecule OLED}, journal={Electrochimica Acta}, year={2015}, volume={184}, pages={86-93}, doi={10.1016/j.electacta.2015.10.047}, note={cited By 8}, url={https://www.scopus.com/inward/record.uri?eid=2-s2.0-84944755119&doi=10.1016%2fj.electacta.2015.10.047&partnerID=40&md5=18b2c2e8e5734469ff7d4bfc67040d5e}, affiliation={Physics Department, University of Durham, South Road, Durham, DH1 3LE, United Kingdom; Faculty of Chemistry, Silesian University of Technology, M. Strzody 9, Gliwice, 44-100, Poland; Center of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, Zabrze, 41-819, Poland; Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, Wroclaw, 50-370, Poland; Department of Electrochemistry, Corrosion and Materials Engineering, Gdansk University of Technology, Narutowicza 11/12, Gdansk, 80-233, Poland}, abstract={Acridone derivative have been synthesised and used as OLED (Organic Light Emitting Diode) emitters which were found to be electroactive. Electrochemical investigations showed a side reaction takes place inside an active layer which diminished the overall device efficiency. By using a dopant and host active layer architecture, the formation of the by product was removed. The by-product was identified as a σ-dimer formed inside an oligomer. The active layers were investigated by electrochemical techniques (cyclic voltammetry, UV-Vis-NIR spectroelectrochemistry, Electron Paramagnetic Resonance (EPR) spectroelectrochemistry and Dynamic Electrochemical Impedance Spectroscopy (DEIS)) to characterize the layers, charge carriers, and electronic energy levels. It is clear from these observations that electrochemical reactions of emitter molecules in a working devices is a route to device degradation. © 2015 Published by Elsevier Ltd.}, author_keywords={Conjugated polymers; Degradation; Molecular electronics; OLED; σ-Dimers}, keywords={Conjugated polymers; Cyclic voltammetry; Degradation; Dimers; Electron spin resonance spectroscopy; Light emitting diodes; Magnetic resonance; Molecular electronics; Molecules; Organic light emitting diodes (OLED); Paramagnetic resonance; Spectroelectrochemistry, Dynamic electrochemical impedance spectroscopy; Electrochemical degradation; Electrochemical investigations; Electrochemical reactions; Electrochemical techniques; Electron paramagnetic resonances (EPR); Electronic energy levels; OLED, Electrochemical impedance spectroscopy}, funding_details={Engineering and Physical Sciences Research CouncilEngineering and Physical Sciences Research Council, EPSRC, EP/K016164/1}, references={Adachi, C., Baldo, M.A., Thompson, M.E., Forrest, S.R., Nearly 100% internal phosphorescence efficiency in an organic light-emitting device (2001) J. 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