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Proceedings Paper

Organic electroluminescent devices with thiophene derivatives
Author(s): Kenji Kawate; Ken-ichi Ohkura; Mikio Yamazaki; Masami Kuroda; Osamu Nabeta
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Paper Abstract

The relationships between molecular structures and properties of organic electroluminescent (EL) devices were investigated by oligothiophene derivatives (TD). Both the peak wavelengths of absorption and photoluminescence of TD increased with increasing number of thiophene rings. The TD were evaluated in two types of layered organic EL devices. In type 1 device, TD was used as an emitting hole transport material, and an oxadiazole derivative was used as an electron transport material. The EL spectra of type 1 devices originate from the TD, and shift to the longer wavelengths with increasing number of thiophene rings. In type 2 device, TD was used as a hole transport material, and tris(8-hydroxyquinoline)-aluminum (Alq3) was used as an emitting electron transport material. The luminous efficiency of type 2 device was higher than that of type 1 device. In the case of type 2 device, the EL spectra were originate from the TD and Alq3. The results were explained by energy diagram.

Paper Details

Date Published: 1 April 1994
PDF: 12 pages
Proc. SPIE 2174, Advanced Flat Panel Display Technologies, (1 April 1994); doi: 10.1117/12.172145
Show Author Affiliations
Kenji Kawate, Fuji Electric Corporate Research and Development, Ltd. (Japan)
Ken-ichi Ohkura, Fuji Electric Corporate Research and Development, Ltd. (Japan)
Mikio Yamazaki, Fuji Electric Corporate Research and Development, Ltd. (Japan)
Masami Kuroda, Fuji Electric Corporate Research and Development, Ltd. (Japan)
Osamu Nabeta, Fuji Electric Corporate Research and Development, Ltd. (Japan)


Published in SPIE Proceedings Vol. 2174:
Advanced Flat Panel Display Technologies
Peter S. Friedman, Editor(s)

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