Long‐Lived Flexible Displays Employing Efficient and Stable Inverted Organic Light‐Emitting Diodes

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  • Hirohiko Fukagawa
    Japan Broadcasting Corporation (NHK) Science & Technology Research Laboratories 1‐10‐11, Kinuta Setagaya‐ku Tokyo 157‐8510 Japan
  • Tsubasa Sasaki
    Japan Broadcasting Corporation (NHK) Science & Technology Research Laboratories 1‐10‐11, Kinuta Setagaya‐ku Tokyo 157‐8510 Japan
  • Toshimitsu Tsuzuki
    Japan Broadcasting Corporation (NHK) Science & Technology Research Laboratories 1‐10‐11, Kinuta Setagaya‐ku Tokyo 157‐8510 Japan
  • Yoshiki Nakajima
    Japan Broadcasting Corporation (NHK) Science & Technology Research Laboratories 1‐10‐11, Kinuta Setagaya‐ku Tokyo 157‐8510 Japan
  • Tatsuya Takei
    Japan Broadcasting Corporation (NHK) Science & Technology Research Laboratories 1‐10‐11, Kinuta Setagaya‐ku Tokyo 157‐8510 Japan
  • Genichi Motomura
    Japan Broadcasting Corporation (NHK) Science & Technology Research Laboratories 1‐10‐11, Kinuta Setagaya‐ku Tokyo 157‐8510 Japan
  • Munehiro Hasegawa
    Nippon Shokubai Co., Ltd. 5‐8 Nishi Otabi‐cho Suita Osaka 564‐8512 Japan
  • Katsuyuki Morii
    Nippon Shokubai Co., Ltd. 5‐8 Nishi Otabi‐cho Suita Osaka 564‐8512 Japan
  • Takahisa Shimizu
    Japan Broadcasting Corporation (NHK) Science & Technology Research Laboratories 1‐10‐11, Kinuta Setagaya‐ku Tokyo 157‐8510 Japan

説明

<jats:title>Abstract</jats:title><jats:p>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.</jats:p>

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