Organic electroluminescent devices with thiophene derivatives

Kenji Kawate; Ken-ichi Ohkura; Mikio Yamazaki; Masami Kuroda; Osamu Nabeta

doi:10.1117/12.172145

1 April 1994 Organic electroluminescent devices with thiophene derivatives

Kenji Kawate, Ken-ichi Ohkura, Mikio Yamazaki, Masami Kuroda, Osamu Nabeta

Proceedings Volume 2174, Advanced Flat Panel Display Technologies; (1994) https://doi.org/10.1117/12.172145
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

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.

Citation Download Citation

Kenji Kawate, Ken-ichi Ohkura, Mikio Yamazaki, Masami Kuroda, and Osamu Nabeta "Organic electroluminescent devices with thiophene derivatives", Proc. SPIE 2174, Advanced Flat Panel Display Technologies, (1 April 1994); https://doi.org/10.1117/12.172145

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