Spin-Assembled Nanolayer of a Hyperbranched Polymer on the Anode in Organic Light-Emitting Diodes: The Mechanism of Hole Injection and Electron Blocking
SCIE
SCOPUS
- Title
- Spin-Assembled Nanolayer of a Hyperbranched Polymer on the Anode in Organic Light-Emitting Diodes: The Mechanism of Hole Injection and Electron Blocking
- Authors
- Lee, TW; Park, JJ; Kwon, Y; Hayakawa, T; Choi, TL; Park, JH; Das, RR; Kakimoto, MA
- Date Issued
- 2008-11-04
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We introduced a spin-assembled nanolayer of hyperbranched poly(ether sulfone) with sulfonic acid terminal on top of an indium-tin oxide anode in organic light-emitting diodes. This results in great improvement in luminous efficiency, better than that of devices using a commercially available conducting polymer composition as a hole-injection layer. The effect of the nanolayer was investigated by impedance spectroscopy, photovoltaic measurement for built-in-potential, and transient electroluminescence. We concluded that the high luminous efficiency resulted from the efficient electron-blocking by the nanolayer and hole-injection assisted by the accumulation of electrons at the interface. This result implies that, for an efficient hole-injection layer, the electron-blocking capability should be incorporated in addition to the hole-injection and -transport capability.
- Keywords
- ELECTROLUMINESCENT DEVICES; ENHANCED PERFORMANCE; TRANSPORT MATERIAL; CARRIER INJECTION; LAYER; EFFICIENCY; POLYANILINE; SPECTROSCOPY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22426
- DOI
- 10.1021/LA800985K
- ISSN
- 0743-7463
- Article Type
- Article
- Citation
- LANGMUIR, vol. 24, no. 21, page. 12704 - 12709, 2008-11-04
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- There are no files associated with this item.
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