Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes.

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Type
Article
Authors
Pozov, Sergey M cc
Ioakeimidis, Apostolos cc
Papadas, Ioannis T
Sun, Chen
Chrusou, Alexandra Z
Bradley, Donal cc
Choulis, Stelios A cc
KAUST Department
Physical Science and Engineering (PSE) Division
Material Science and Engineering Program
Office of the VP
Research
Date
2020-11-11
Submitted Date
2020-10-11
Permanent link to this record
http://hdl.handle.net/10754/665959

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Abstract
The performance of solution-processed organic light emitting diodes (OLEDs) is often limited by non-uniform contacts. In this work, we introduce Ni-containing solution-processed metal oxide (MO) interfacial layers inserted between indium tin oxide (ITO) and poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) to improve the bottom electrode contact for OLEDs using the poly(p-phenylene vinylene) (PPV) derivative Super-Yellow (SY) as an emission layer. For ITO/Ni-containing MO/PEDOT:PSS bottom electrode structures we show enhanced wetting properties that result in an improved OLED device efficiency. Best performance is achieved using a Cu-Li co-doped spinel nickel cobaltite [(Cu-Li):NiCo2O4], for which the current efficiency and luminous efficacy of SY OLEDs increased, respectively, by 12% and 11% from the values obtained for standard devices without a Ni-containing MO interface modification between ITO and PEDOT:PSS. The enhanced performance was attributed to the improved morphology of PEDOT:PSS, which consequently increased the hole injection capability of the optimized ITO/(Cu-Li):NiCo2O4/PEDOT:PSS electrode.
Citation
Pozov, S. M., Ioakeimidis, A., Papadas, I. T., Sun, C., Chrusou, A. Z., Bradley, D. D. C., & Choulis, S. A. (2020). Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes. Materials, 13(22), 5082. doi:10.3390/ma13225082
Sponsors
This project received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No.647311) and further supported from internal Cyprus University of Technology funding to the Molecular Electronics and Photonics Research Unit. C.S and D.D.C.B thank the Royal Society for the provision of a Newton International Fellowship to C.S (Application number: NF171117) that funded her stay in Oxford.
Publisher
MDPI AG
Journal
Materials
DOI
10.3390/ma13225082
PubMed ID
33187216
Additional Links
https://www.mdpi.com/1996-1944/13/22/5082
Collections
Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Except where otherwise noted, this item's license is described as This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.