Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters

Abstract Improving the performance of blue organic light-emitting diodes (OLEDs) is needed for full-colour flat-panel displays and solid-state lighting sources. The use of thermally activated delayed fluorescence (TADF) is a promising approach to efficient blue electroluminescence. However, the diff...

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Autores principales:	Takuya Miwa, Shosei Kubo, Katsuyuki Shizu, Takeshi Komino, Chihaya Adachi, Hironori Kaji
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9eaa9548fb1140189e7bf177e924061a
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spelling	oai:doaj.org-article:9eaa9548fb1140189e7bf177e924061a2021-12-02T11:52:17ZBlue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters10.1038/s41598-017-00368-52045-2322https://doaj.org/article/9eaa9548fb1140189e7bf177e924061a2017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00368-5https://doaj.org/toc/2045-2322Abstract Improving the performance of blue organic light-emitting diodes (OLEDs) is needed for full-colour flat-panel displays and solid-state lighting sources. The use of thermally activated delayed fluorescence (TADF) is a promising approach to efficient blue electroluminescence. However, the difficulty of developing efficient blue TADF emitters lies in finding a molecular structure that simultaneously incorporates (i) a small energy difference between the lowest excited singlet state (S1) and the lowest triplet state (T1), ΔE ST, (ii) a large oscillator strength, f, between S1 and the ground state (S0), and (iii) S1 energy sufficiently high for blue emission. In this study, we develop TADF emitters named CCX-I and CCX-II satisfying the above requirements. They show blue photoluminescence and high triplet-to-singlet up-conversion yield. In addition, their transition dipole moments are horizontally oriented, resulting in further increase of their electroluminescence efficiency. Using CCX-II as an emitting dopant, we achieve a blue OLED showing a high external quantum efficiency of 25.9%, which is one of the highest EQEs in blue OLEDs reported previously.Takuya MiwaShosei KuboKatsuyuki ShizuTakeshi KominoChihaya AdachiHironori KajiNature 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 Takuya Miwa Shosei Kubo Katsuyuki Shizu Takeshi Komino Chihaya Adachi Hironori Kaji Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters
description	Abstract Improving the performance of blue organic light-emitting diodes (OLEDs) is needed for full-colour flat-panel displays and solid-state lighting sources. The use of thermally activated delayed fluorescence (TADF) is a promising approach to efficient blue electroluminescence. However, the difficulty of developing efficient blue TADF emitters lies in finding a molecular structure that simultaneously incorporates (i) a small energy difference between the lowest excited singlet state (S1) and the lowest triplet state (T1), ΔE ST, (ii) a large oscillator strength, f, between S1 and the ground state (S0), and (iii) S1 energy sufficiently high for blue emission. In this study, we develop TADF emitters named CCX-I and CCX-II satisfying the above requirements. They show blue photoluminescence and high triplet-to-singlet up-conversion yield. In addition, their transition dipole moments are horizontally oriented, resulting in further increase of their electroluminescence efficiency. Using CCX-II as an emitting dopant, we achieve a blue OLED showing a high external quantum efficiency of 25.9%, which is one of the highest EQEs in blue OLEDs reported previously.
format	article
author	Takuya Miwa Shosei Kubo Katsuyuki Shizu Takeshi Komino Chihaya Adachi Hironori Kaji
author_facet	Takuya Miwa Shosei Kubo Katsuyuki Shizu Takeshi Komino Chihaya Adachi Hironori Kaji
author_sort	Takuya Miwa
title	Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters
title_short	Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters
title_full	Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters
title_fullStr	Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters
title_full_unstemmed	Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters
title_sort	blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9eaa9548fb1140189e7bf177e924061a
work_keys_str_mv	AT takuyamiwa blueorganiclightemittingdiodesrealizingexternalquantumefficiencyover25usingthermallyactivateddelayedfluorescenceemitters AT shoseikubo blueorganiclightemittingdiodesrealizingexternalquantumefficiencyover25usingthermallyactivateddelayedfluorescenceemitters AT katsuyukishizu blueorganiclightemittingdiodesrealizingexternalquantumefficiencyover25usingthermallyactivateddelayedfluorescenceemitters AT takeshikomino blueorganiclightemittingdiodesrealizingexternalquantumefficiencyover25usingthermallyactivateddelayedfluorescenceemitters AT chihayaadachi blueorganiclightemittingdiodesrealizingexternalquantumefficiencyover25usingthermallyactivateddelayedfluorescenceemitters AT hironorikaji blueorganiclightemittingdiodesrealizingexternalquantumefficiencyover25usingthermallyactivateddelayedfluorescenceemitters
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Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters

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