Development of operationally stable inverted organic light-emitting diode prepared without using alkali metals (Presentation Recording)

Hirohiko Fukagawa; Katsuyuki Morii; Munehiro Hasegawa; Shun Gouda; Toshimitsu Tsuzuki; Takahisa Shimizu; Toshihiro Yamamoto

doi:10.1117/12.2187602

5 October 2015 Development of operationally stable inverted organic light-emitting diode prepared without using alkali metals (Presentation Recording)

Hirohiko Fukagawa, Katsuyuki Morii, Munehiro Hasegawa, Shun Gouda, Toshimitsu Tsuzuki, Takahisa Shimizu, Toshihiro Yamamoto

Author Affiliations +

Proceedings Volume 9566, Organic Light Emitting Materials and Devices XIX; 956612 (2015) https://doi.org/10.1117/12.2187602
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States

Abstract

The OLED is one of the key devices for realizing future flexible displays and lightings. One of the biggest challenges left for the OLED fabricated on a flexible substrate is the improvement of its resistance to oxygen and moisture. A high barrier layer [a water vapor transmission rate (WVTR) of about 10-6 g/m2/day] is proposed to be necessary for the encapsulation of conventional OLEDs. Some flexible high barrier layers have recently been demonstrated; however, such high barrier layers require a complex process, which makes flexible OLEDs expensive. If an OLED is prepared without using air-sensitive materials such as alkali metals, no stringent encapsulation is necessary for such an OLED. In this presentation, we will discuss our continuing efforts to develop an inverted OLED (iOLED) prepared without using alkali metals. iOLEDs with a bottom cathode are considered to be effective for realizing air-stable OLEDs since the electron injection layer (EIL) can be prepared by fabrication processes that might damage the organic layers, resulting in the enhanced range of materials suitable for EILs. We have demonstrated that a highly efficient and relatively air-stable iOLED can be realized by employing poly(ethyleneimine) as an EIL. Dark spot formation was not observed after 250 days in the poly(ethyleneimine)-based iOLED encapsulated by a barrier film with a WVTR of 10-4 g/m2/day. In addition, we have demonstrated the fabrication of a highly operational stable iOLED utilizing a newly developed EIL. The iOLED exhibits an expected half-lifetime of over 10,000 h from an initial luminance of 1,000 cd/m2.

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Hirohiko Fukagawa, Katsuyuki Morii, Munehiro Hasegawa, Shun Gouda, Toshimitsu Tsuzuki, Takahisa Shimizu, and Toshihiro Yamamoto "Development of operationally stable inverted organic light-emitting diode prepared without using alkali metals (Presentation Recording)", Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 956612 (5 October 2015); https://doi.org/10.1117/12.2187602

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KEYWORDS

Organic light emitting diodes

Alkali metals

Flexible displays

Light sources and illumination

Oxygen

Resistance

Carbon monoxide

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