Does giant surface potential modify the performance of Alq 3-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

Does giant surface potential modify the performance of Alq ₃-based OLED? Voltage shift and charge traps induced by light irradiation

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

Department of Pure and Applied Chemistry

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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 Alq ₃ film.

Original language	English
Title of host publication	Organic Light Emitting Materials and Devices XII
DOIs	https://doi.org/10.1117/12.795640
Publication status	Published - 2008
Event	Organic Light Emitting Materials and Devices XII - San Diego, CA, United States Duration: 10 Aug 2008 → 12 Aug 2008

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7051
ISSN (Print)	0277-786X

Conference

Conference	Organic Light Emitting Materials and Devices XII
Country/Territory	United States
City	San Diego, CA
Period	10/08/08 → 12/08/08

Keywords

Alq
Displacement current measurement
Giant surface potential
Interfacial charge
Orientaion polarization

Access to Document

10.1117/12.795640

Cite this

Noguchi, Y., Sato, N., Tanaka, Y., Nakayama, Y., & Ishii, H. (2008). Does giant surface potential modify the performance of Alq ₃-based OLED? Voltage shift and charge traps induced by light irradiation. In Organic Light Emitting Materials and Devices XII Article 70510K (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7051). https://doi.org/10.1117/12.795640

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title = "Does giant surface potential modify the performance of Alq 3-based OLED? Voltage shift and charge traps induced by light irradiation",

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 Alq 3 film.",

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author = "Yutaka Noguchi and Naoki Sato and Yuya Tanaka and Yasuo Nakayama and Hisao Ishii",

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Noguchi, Y, Sato, N, Tanaka, Y, Nakayama, Y & Ishii, H 2008, Does giant surface potential modify the performance of Alq ₃-based OLED? Voltage shift and charge traps induced by light irradiation. in Organic Light Emitting Materials and Devices XII., 70510K, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7051, Organic Light Emitting Materials and Devices XII, San Diego, CA, United States, 10/08/08. https://doi.org/10.1117/12.795640

Does giant surface potential modify the performance of Alq ₃-based OLED? Voltage shift and charge traps induced by light irradiation. / Noguchi, Yutaka; Sato, Naoki; Tanaka, Yuya et al.
Organic Light Emitting Materials and Devices XII. 2008. 70510K (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7051).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Nakayama, Yasuo

AU - Ishii, Hisao

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AB - 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 Alq 3 film.

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