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Long‐Lived Flexible Displays Employing Efficient and Stable Inverted Organic Light‐Emitting Diodes
Author(s) -
Fukagawa Hirohiko,
Sasaki Tsubasa,
Tsuzuki Toshimitsu,
Nakajima Yoshiki,
Takei Tatsuya,
Motomura Genichi,
Hasegawa Munehiro,
Morii Katsuyuki,
Shimizu Takahisa
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706768
Subject(s) - oled , materials science , optoelectronics , fabrication , diode , flexible display , encapsulation (networking) , nanotechnology , layer (electronics) , thin film transistor , computer science , medicine , computer network , alternative medicine , pathology
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.