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Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer

Organic light-emitting diodes are a key technology for next-generation information displays because of their low power consumption and potentially long operational lifetimes. Although devices with internal quantum efficiencies of approximately 100% have been achieved using phosphorescent or thermall...

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Autores principales: Fukagawa, Hirohiko, Shimizu, Takahisa, Iwasaki, Yukiko, Yamamoto, Toshihiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5431848/
https://www.ncbi.nlm.nih.gov/pubmed/28496139
http://dx.doi.org/10.1038/s41598-017-02033-3
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author Fukagawa, Hirohiko
Shimizu, Takahisa
Iwasaki, Yukiko
Yamamoto, Toshihiro
author_facet Fukagawa, Hirohiko
Shimizu, Takahisa
Iwasaki, Yukiko
Yamamoto, Toshihiro
author_sort Fukagawa, Hirohiko
collection PubMed
description Organic light-emitting diodes are a key technology for next-generation information displays because of their low power consumption and potentially long operational lifetimes. Although devices with internal quantum efficiencies of approximately 100% have been achieved using phosphorescent or thermally activated delayed fluorescent emitters, a systematic understanding of materials suitable for operationally stable devices is lacking. Here we demonstrate that the operational stability of phosphorescent devices is nearly proportional to the Förster resonance energy transfer rate from the host to the emitter when thermally activated delayed fluorescence molecules are used as the hosts. We find that a small molecular size is a requirement for thermally activated delayed fluorescence molecules employed as phosphorescent hosts; in contrast, an extremely small energy gap between the singlet and triplet excited states, which is essential for an efficient thermally activated delayed fluorescent emitter, is unnecessary in the phosphorescent host.
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spelling pubmed-54318482017-05-16 Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer Fukagawa, Hirohiko Shimizu, Takahisa Iwasaki, Yukiko Yamamoto, Toshihiro Sci Rep Article Organic light-emitting diodes are a key technology for next-generation information displays because of their low power consumption and potentially long operational lifetimes. Although devices with internal quantum efficiencies of approximately 100% have been achieved using phosphorescent or thermally activated delayed fluorescent emitters, a systematic understanding of materials suitable for operationally stable devices is lacking. Here we demonstrate that the operational stability of phosphorescent devices is nearly proportional to the Förster resonance energy transfer rate from the host to the emitter when thermally activated delayed fluorescence molecules are used as the hosts. We find that a small molecular size is a requirement for thermally activated delayed fluorescence molecules employed as phosphorescent hosts; in contrast, an extremely small energy gap between the singlet and triplet excited states, which is essential for an efficient thermally activated delayed fluorescent emitter, is unnecessary in the phosphorescent host. Nature Publishing Group UK 2017-05-11 /pmc/articles/PMC5431848/ /pubmed/28496139 http://dx.doi.org/10.1038/s41598-017-02033-3 Text en © The Author(s) 2017 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/.
spellingShingle Article
Fukagawa, Hirohiko
Shimizu, Takahisa
Iwasaki, Yukiko
Yamamoto, Toshihiro
Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer
title Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer
title_full Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer
title_fullStr Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer
title_full_unstemmed Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer
title_short Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer
title_sort operational lifetimes of organic light-emitting diodes dominated by förster resonance energy transfer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5431848/
https://www.ncbi.nlm.nih.gov/pubmed/28496139
http://dx.doi.org/10.1038/s41598-017-02033-3
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