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

Abstract 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...

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Autores principales:	Hirohiko Fukagawa, Takahisa Shimizu, Yukiko Iwasaki, Toshihiro Yamamoto
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e9c3d4b5a1264c799ae48d28791995b6
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spelling	oai:doaj.org-article:e9c3d4b5a1264c799ae48d28791995b62021-12-02T11:52:37ZOperational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer10.1038/s41598-017-02033-32045-2322https://doaj.org/article/e9c3d4b5a1264c799ae48d28791995b62017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02033-3https://doaj.org/toc/2045-2322Abstract 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.Hirohiko FukagawaTakahisa ShimizuYukiko IwasakiToshihiro YamamotoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hirohiko Fukagawa Takahisa Shimizu Yukiko Iwasaki Toshihiro Yamamoto Operational lifetimes of organic light-emitting diodes dominated by Förster resonance energy transfer
description	Abstract 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.
format	article
author	Hirohiko Fukagawa Takahisa Shimizu Yukiko Iwasaki Toshihiro Yamamoto
author_facet	Hirohiko Fukagawa Takahisa Shimizu Yukiko Iwasaki Toshihiro Yamamoto
author_sort	Hirohiko Fukagawa
title	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_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_sort	operational lifetimes of organic light-emitting diodes dominated by förster resonance energy transfer
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e9c3d4b5a1264c799ae48d28791995b6
work_keys_str_mv	AT hirohikofukagawa operationallifetimesoforganiclightemittingdiodesdominatedbyforsterresonanceenergytransfer AT takahisashimizu operationallifetimesoforganiclightemittingdiodesdominatedbyforsterresonanceenergytransfer AT yukikoiwasaki operationallifetimesoforganiclightemittingdiodesdominatedbyforsterresonanceenergytransfer AT toshihiroyamamoto operationallifetimesoforganiclightemittingdiodesdominatedbyforsterresonanceenergytransfer
_version_	1718395019081023488

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

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