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Technical Issues in Graphene Anode Organic Light Emitting Diodes
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- Authors
- Jaehyun Moon, Jin-Wook Shin, Hyunsu Cho, Jun-Han Han, Nam Sung Cho, Jong Tae Lim, Seung Koo Park, Hong Kyw Choi, Sung-Yool Choi, Ji-Hoon Kim, Min-Jae Maeng, Jaewon Seo, Yongsup Park, Jeong-Ik Lee
- Issue Date
- 2015-08
- Citation
- Diamond and Related Materials, v.57, pp.68-73
- ISSN
- 0925-9635
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- Optical, interfacial and patterning issues of anode graphene films in organic light emitting diode (OLED) applications were investigated. In the optical part, the microcavities of graphene and indium tin oxide (ITO) anode OLEDs were contrasted. With the use of graphene one may avoid spectral and organic stack design problems related to microcavity problems. However, due to the weak microcavity, emission enhancement using interference designs is practically impossible. By inserting an electron acceptor insert at the graphene/hole transport layer (HTL) interface, it was possible to enhance the current density by factor of three. Based on in situ ultraviolet photoelectron spectroscopy (UPS) results, the insert was interpreted as being a charge generation layer. Graphene patterning using laser or plasma methods turned out to be problematic. None of those methods could offer acceptable dimension accuracy and preserved graphene quality.
- KSP Keywords
- Charge generation layer, Dimension accuracy, Electron acceptor, Emission enhancement, Organic light-emitting diodes(OLEDS), Stack design, current density, graphene anode, graphene films, graphene patterning, hole transport layer