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Proceedings Paper

Does giant surface potential modify the performance of Alq3-based OLED?: voltage shift and charge traps induced by light irradiation
Author(s): Yutaka Noguchi; Naoki Sato; Yuya Tanaka; Yasuo Nakayama; Hisao Ishii
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Paper Abstract

A giant surface potential (GSP) has been observed on a tris-(8-hydroxyquinolate) aluminum (Alq3) film deposited on a glass or a metal substrate under dark conditions. However, the effects of a GSP on the device properties of Alq3-based organic light-emitting diodes (OLEDs) has not been considered. In this paper, we report on the effects of ambient light during the fabrication of an Alq3-based OLED on the device properties by displacement current measurement. We found that the light irradiation significantly reduces the density of charge existing at the 4,4'-bis[N-(1-naphthyl)-N-phenylamino]-biphenyl/Alq3 interface and results in the formation of charge traps in the Alq3 layer. Considering the similarities between the GSP and the interfacial charge, they can be attributed to the same origin; the orientaion polarization of Alq3 film.

Paper Details

Date Published: 2 September 2008
PDF: 8 pages
Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510K (2 September 2008); doi: 10.1117/12.795640
Show Author Affiliations
Yutaka Noguchi, Chiba Univ. (Japan)
Naoki Sato, Chiba Univ. (Japan)
Yuya Tanaka, Chiba Univ. (Japan)
Yasuo Nakayama, Chiba Univ. (Japan)
Hisao Ishii, Chiba Univ. (Japan)

Published in SPIE Proceedings Vol. 7051:
Organic Light Emitting Materials and Devices XII
Franky So; Chihaya Adachi, Editor(s)

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