Does giant surface potential modify the performance of Alq3-based OLED?: voltage shift and charge traps induced by light irradiation

Yutaka Noguchi; Naoki Sato; Yuya Tanaka; Yasuo Nakayama; Hisao Ishii

doi:10.1117/12.795640

2 September 2008 Does giant surface potential modify the performance of Alq₃-based OLED?: voltage shift and charge traps induced by light irradiation

Yutaka Noguchi, Naoki Sato, Yuya Tanaka, Yasuo Nakayama, Hisao Ishii

Author Affiliations +

Proceedings Volume 7051, Organic Light Emitting Materials and Devices XII; 70510K (2008) https://doi.org/10.1117/12.795640
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

Yutaka Noguchi, Naoki Sato, Yuya Tanaka, Yasuo Nakayama, and Hisao Ishii "Does giant surface potential modify the performance of Alq₃-based OLED?: voltage shift and charge traps induced by light irradiation", Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510K (2 September 2008); https://doi.org/10.1117/12.795640

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KEYWORDS

Organic light emitting diodes

Aluminum

OLED lighting

Glasses

Electrons

Interfaces

Metals

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