Flexible Top-Emitting Organic Light-Emitting Diodes Using Semi-Transparent Multi-Metal Layers
- Authors
- Hyung, Gun Woo; Park, Jaehoon; Koo, Ja-Ryong; Lee, Seok Jae; Lee, Ho Won; Kim, You Hyun; Kim, Woo Young; Kim, Young Kwan
- Issue Date
- Jul-2012
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Top-Emitting Organic Light Emitting Diodes (TEOLEDs); Oxygen Plasma; Optical Properties; Electrical Properties; Nickel Oxide; Hole Injection
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.12, no.7, pp.5444 - 5448
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 12
- Number
- 7
- Start Page
- 5444
- End Page
- 5448
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/18939
- DOI
- 10.1166/jnn.2012.6232
- ISSN
- 1533-4880
- Abstract
- In this paper, the improved device performance of top-emitting organic light-emitting diodes (TEOLEDs) with a thin multi-metal layer stack of nickel/silver/nickel (Ni/Ag/Ni) and aluminum/silver/aluminum (Al/Ag/Al) that were used as the anode and cathode on a flexible substrate is discussed. In particular, Indium-Tin-Oxide (ITO) as an anode electrode has been used recently even though it has some problems for flexible devices. Therefore we suggested that a thin multi-metal layer electrode as a new anode is fabricated instead of ITO anode. It was verified that the ITO-free TEOLEDs showed an enhanced probability of the recombination of the electrons and holes through an improved electron/hole charge balance. We also analyzed the optical and electrical characteristics using the current density, luminance, luminance efficiency, external quantum efficiency (EQE), CIE x, y coordinates, and EL spectra of flexible TEOLED devices were characterized. ITO-free, flexible, green-emitting OLEDs with a low cost and a simple process were demonstrated.
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