Long-lived efficient delayed fluorescence organic light-emitting diodes using n-type hosts

Lin-Song Cui, Shi-Bin Ruan, Fatima Bencheikh, Ryo Nagata, Lei Zhang, Ko Inada, Hajime Nakanotani, Liang-Sheng Liao () and Chihaya Adachi ()
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Lin-Song Cui: Kyushu University
Shi-Bin Ruan: Kyushu University
Fatima Bencheikh: Kyushu University
Ryo Nagata: Kyushu University
Lei Zhang: Soochow University
Ko Inada: Kyushu University
Hajime Nakanotani: Kyushu University
Liang-Sheng Liao: Soochow University
Chihaya Adachi: Kyushu University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Organic light-emitting diodes have become a mainstream display technology because of their desirable features. Third-generation electroluminescent devices that emit light through a mechanism called thermally activated delayed fluorescence are currently garnering much attention. However, unsatisfactory device stability is still an unresolved issue in this field. Here we demonstrate that electron-transporting n-type hosts, which typically include an acceptor moiety in their chemical structure, have the intrinsic ability to balance the charge fluxes and broaden the recombination zone in delayed fluorescence organic electroluminescent devices, while at the same time preventing the formation of high-energy excitons. The n-type hosts lengthen the lifetimes of green and blue delayed fluorescence devices by > 30 and 1000 times, respectively. Our results indicate that n-type hosts are suitable to realize stable delayed fluorescence organic electroluminescent devices.

Date: 2017
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DOI: 10.1038/s41467-017-02419-x

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