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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 languageEnglish
Title of host publicationOrganic Light Emitting Materials and Devices XII
DOIs
Publication statusPublished - 13 Nov 2008
EventOrganic Light Emitting Materials and Devices XII - San Diego, CA, United States
Duration: 10 Aug 200812 Aug 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7051
ISSN (Print)0277-786X

Conference

ConferenceOrganic Light Emitting Materials and Devices XII
CountryUnited States
CitySan Diego, CA
Period10/08/0812/08/08

Keywords

  • Alq
  • Displacement current measurement
  • Giant surface potential
  • Interfacial charge
  • Orientaion polarization

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 [70510K] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7051). https://doi.org/10.1117/12.795640