Hole-enhanced electron injection from ZnO in inverted polymer light-emitting diodes
| Autor: | Paul W. M. Blom, Herman T. Nicolai, Gert-Jan A. H. Wetzelaer, Paul de Bruyn, Mingtao Lu |
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| Přispěvatelé: | Zernike Institute for Advanced Materials, Polymer Chemistry and Bioengineering |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
SOLAR-CELLS
Materials science POLY(P-PHENYLENE VINYLENE) Injection barrier BLENDS law.invention Biomaterials chemistry.chemical_compound law Light-emitting diode LEVEL ALIGNMENT Zinc oxide Materials Chemistry OLED Work function Electrical and Electronic Engineering Polymer Diode STABLE METAL-OXIDES Organic business.industry Energy conversion efficiency Poly(p-phenylene vinylene) General Chemistry Inverted PERFORMANCE Condensed Matter Physics Cathode TRANSPORT Electronic Optical and Magnetic Materials Amorphous solid chemistry LAYER Optoelectronics business INTERFACES |
| Zdroj: | Organic Electronics, 13(9), 1693-1699. ELSEVIER SCIENCE BV |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2012.05.032 |
| Popis: | Metal oxides as ZnO provide an interesting alternative for conventional low work function metals as electron injection layer in organic light-emitting diodes (OLEDs). However, for most state-of-the-art OLED materials the high work function of ZnO leads to a large injection barrier for electrons. As a result the electron current in the OLED is largely limited by the contact, leading to a strong reduction of the conversion efficiency. Here we demonstrate that by depositing an amorphous ZnO layer as cathode in an inverted polymer LED, the electron injection can be strongly enhanced by electrical conditioning. For suited polymers comparable conversion efficiencies of the conventional and inverted PLEDs can be achieved. (C) 2012 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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