Long‐Lived Flexible Displays Employing Efficient and Stable Inverted Organic Light‐Emitting Diodes. Issue 28 (29th May 2018)

• Record Type: Journal Article
• Authors: Fukagawa, Hirohiko; Sasaki, Tsubasa; Tsuzuki, Toshimitsu; Nakajima, Yoshiki; Takei, Tatsuya; Motomura, Genichi; Hasegawa, Munehiro; Morii, Katsuyuki; Shimizu, Takahisa
• Is Part Of: Advanced materials. Volume 30:Issue 28(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-05-29
• Subjects: air‐stable -- electron injection -- flexible electronics -- organic light‐emitting diodes; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201706768
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Although organic light‐emitting diodes (OLEDs) are promising for use in applications such as in flexible displays, reports of long‐lived flexible OLED‐based devices are limited due to the poor environmental stability of OLEDs. Flexible substrates such as plastic allow ambient oxygen and moisture to permeate into devices, which degrades the alkali metals used for the electron‐injection layer in conventional OLEDs (cOLEDs). Here, the fabrication of a long‐lived flexible display is reported using efficient and stable inverted OLEDs (iOLEDs), in which electrons can be effectively injected without the use of alkali metals. The flexible display employing iOLEDs can emit light for over 1 year with simplified encapsulation, whereas a flexible display employing cOLEDs exhibits almost no luminescence after only 21 d with the same encapsulation. These results demonstrate the great potential of iOLEDs to replace cOLEDs employing alkali metals for use in a wide variety of flexible organic optoelectronic devices. Abstract : A long‐lived flexible display is demonstrated by employing efficient and stable inverted organic light‐emitting diodes (OLEDs), in which electrons can be effectively injected without using alkali metals. The flexible display employing inverted OLEDs can emit light for over 1 year with simplified encapsulation, whereas flexible displays employing conventional OLEDs exhibit almost no luminescence after only 21 d with the same encapsulation.