Cargando…

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

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 bee...

Descripción completa

Detalles Bibliográficos
Autores principales: Sasaki, Tsubasa, Hasegawa, Munehiro, Inagaki, Kaito, Ito, Hirokazu, Suzuki, Kazuma, Oono, Taku, Morii, Katsuyuki, Shimizu, Takahisa, Fukagawa, Hirohiko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8113438/
https://www.ncbi.nlm.nih.gov/pubmed/33976196
http://dx.doi.org/10.1038/s41467-021-23067-2
_version_ 1783690859000102912
author Sasaki, Tsubasa
Hasegawa, Munehiro
Inagaki, Kaito
Ito, Hirokazu
Suzuki, Kazuma
Oono, Taku
Morii, Katsuyuki
Shimizu, Takahisa
Fukagawa, Hirohiko
author_facet Sasaki, Tsubasa
Hasegawa, Munehiro
Inagaki, Kaito
Ito, Hirokazu
Suzuki, Kazuma
Oono, Taku
Morii, Katsuyuki
Shimizu, Takahisa
Fukagawa, Hirohiko
author_sort Sasaki, Tsubasa
collection PubMed
description 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.
format Online
Article
Text
id pubmed-8113438
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-81134382021-05-14 Unravelling the electron injection/transport mechanism in organic light-emitting diodes Sasaki, Tsubasa Hasegawa, Munehiro Inagaki, Kaito Ito, Hirokazu Suzuki, Kazuma Oono, Taku Morii, Katsuyuki Shimizu, Takahisa Fukagawa, Hirohiko Nat Commun Article 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. Nature Publishing Group UK 2021-05-11 /pmc/articles/PMC8113438/ /pubmed/33976196 http://dx.doi.org/10.1038/s41467-021-23067-2 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Sasaki, Tsubasa
Hasegawa, Munehiro
Inagaki, Kaito
Ito, Hirokazu
Suzuki, Kazuma
Oono, Taku
Morii, Katsuyuki
Shimizu, Takahisa
Fukagawa, Hirohiko
Unravelling the electron injection/transport mechanism in organic light-emitting diodes
title Unravelling the electron injection/transport mechanism in organic light-emitting diodes
title_full Unravelling the electron injection/transport mechanism in organic light-emitting diodes
title_fullStr Unravelling the electron injection/transport mechanism in organic light-emitting diodes
title_full_unstemmed Unravelling the electron injection/transport mechanism in organic light-emitting diodes
title_short Unravelling the electron injection/transport mechanism in organic light-emitting diodes
title_sort unravelling the electron injection/transport mechanism in organic light-emitting diodes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8113438/
https://www.ncbi.nlm.nih.gov/pubmed/33976196
http://dx.doi.org/10.1038/s41467-021-23067-2
work_keys_str_mv AT sasakitsubasa unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT hasegawamunehiro unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT inagakikaito unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT itohirokazu unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT suzukikazuma unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT oonotaku unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT moriikatsuyuki unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT shimizutakahisa unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes
AT fukagawahirohiko unravellingtheelectroninjectiontransportmechanisminorganiclightemittingdiodes