Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes
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(styr...
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| Format: | Article |
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2020-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/22/5082 |
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| author | Sergey M. Pozov Apostolos Ioakeimidis Ioannis T. Papadas Chen Sun Alexandra Z. Chrusou Donal D. C. Bradley Stelios A. Choulis |
| author_facet | Sergey M. Pozov Apostolos Ioakeimidis Ioannis T. Papadas Chen Sun Alexandra Z. Chrusou Donal D. C. Bradley Stelios A. Choulis |
| author_sort | Sergey M. Pozov |
| collection | DOAJ |
| description | 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):NiCo<sub>2</sub>O<sub>4</sub>], 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):NiCo<sub>2</sub>O<sub>4</sub>/PEDOT:PSS electrode. |
| first_indexed | 2024-03-10T14:55:33Z |
| format | Article |
| id | doaj.art-180c25fd58574189b20e7b44031a6e01 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:55:33Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-180c25fd58574189b20e7b44031a6e012023-11-20T20:33:46ZengMDPI AGMaterials1996-19442020-11-011322508210.3390/ma13225082Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting DiodesSergey M. Pozov0Apostolos Ioakeimidis1Ioannis T. Papadas2Chen Sun3Alexandra Z. Chrusou4Donal D. C. Bradley5Stelios A. Choulis6Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, CyprusMolecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, CyprusMolecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, CyprusDepartment of Physics, Clarendon Laboratory, University of Oxford, Parks Rd, Oxford OX1 3PU, UKMolecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, CyprusDepartment of Physics, Clarendon Laboratory, University of Oxford, Parks Rd, Oxford OX1 3PU, UKMolecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, CyprusThe 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):NiCo<sub>2</sub>O<sub>4</sub>], 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):NiCo<sub>2</sub>O<sub>4</sub>/PEDOT:PSS electrode.https://www.mdpi.com/1996-1944/13/22/5082interfaceselectrodeswetting propertiesmetal-oxideshole injectionorganic light emitting diodes |
| spellingShingle | Sergey M. Pozov Apostolos Ioakeimidis Ioannis T. Papadas Chen Sun Alexandra Z. Chrusou Donal D. C. Bradley Stelios A. Choulis Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes Materials interfaces electrodes wetting properties metal-oxides hole injection organic light emitting diodes |
| title | Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes |
| title_full | Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes |
| title_fullStr | Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes |
| title_full_unstemmed | Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes |
| title_short | Bottom Contact Metal Oxide Interface Modification Improving the Efficiency of Organic Light Emitting Diodes |
| title_sort | bottom contact metal oxide interface modification improving the efficiency of organic light emitting diodes |
| topic | interfaces electrodes wetting properties metal-oxides hole injection organic light emitting diodes |
| url | https://www.mdpi.com/1996-1944/13/22/5082 |
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