Construction of a ‘sequential potential field’ by [Cu(pc)]/[Zn(pc)]double-layered thin film: application to electrochromic and electroluminescent devices
✍ Scribed by Tsuyoshi Tominaga; Kohei Hayashi; Naoki Toshima
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 248 KB
- Volume
- 01
- Category
- Article
- ISSN
- 1088-4246
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✦ Synopsis
Sequential potential field' is a concept to produce a potential cascade by the organization of redox components, and to aim for an effective and vectorial electron and/or hole transfer. Construction of the sequential potential field is examined by double-layered thin film composed of two kinds of metallophthalocyanine having different oxidation potentials, i.e. copper phthalocyanine and zinc phthalocyanine. In the electrochromic device of double-layered metallophthalocyanine thin films, hole transfer can be controlled by the order of deposition, which suggests that the present system is suitable for the construction of a sequential potential field. Double-layered metallophthalocyanine thin films were also used as a hole transfer layer in all-solid organic electroluminescent devices. In the case of an indium-tin oxide/copper phthalocyanine/zinc phthalocyanine/tris(8-hydroxyquinoline)aluminum/Mg-Ag device for electroluminescence, a high brightness of more than 4000 cd m -2 can be achieved. This double-layered hole transfer system is more effective than the corresponding single hole transfer system, which is due to the construction of a sequential potential field in the hole transfer layer.