Unravelling the electron injection/transport mechanism in organic light-emitting diodes

Tsubasa Sasaki, Munehiro Hasegawa, Kaito Inagaki, Hirokazu Ito, Kazuma Suzuki, Taku Oono, Katsuyuki Morii, Takahisa Shimizu and Hirohiko Fukagawa ()
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Tsubasa Sasaki: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories
Munehiro Hasegawa: Nippon Shokubai Co., Ltd.
Kaito Inagaki: Tokyo University of Science
Hirokazu Ito: Tokyo University of Science
Kazuma Suzuki: Tokyo University of Science
Taku Oono: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories
Katsuyuki Morii: Nippon Shokubai Co., Ltd.
Takahisa Shimizu: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories
Hirohiko Fukagawa: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Although significant progress has been made in the development of light-emitting materials for organic light-emitting diodes along with the elucidation of emission mechanisms, the electron injection/transport mechanism remains unclear, and the materials used for electron injection/transport have been basically unchanged for more than 20 years. Here, we unravelled the electron injection/transport mechanism by tuning the work function near the cathode to about 2.0 eV using a superbase. This extremely low-work function cathode allows direct electron injection into various materials, and it was found that organic materials can transport electrons independently of their molecular structure. On the basis of these findings, we have realised a simply structured blue organic light-emitting diode with an operational lifetime of more than 1,000,000 hours. Unravelling the electron injection/transport mechanism, as reported in this paper, not only greatly increases the choice of materials to be used for devices, but also allows simple device structures.

Date: 2021
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DOI: 10.1038/s41467-021-23067-2

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