Highly efficient blue electroluminescence based on thermally activated delayed fluorescence.
Identifieur interne : 000C78 ( Ncbi/Curation ); précédent : 000C77; suivant : 000C79Highly efficient blue electroluminescence based on thermally activated delayed fluorescence.
Auteurs : Shuzo Hirata [Japon] ; Yumi Sakai [Japon] ; Kensuke Masui [Japon] ; Hiroyuki Tanaka [Japon] ; Sae Youn Lee [Japon] ; Hiroko Nomura [Japon] ; Nozomi Nakamura [Japon] ; Mao Yasumatsu [Japon] ; Hajime Nakanotani [Japon] ; Qisheng Zhang [Japon] ; Katsuyuki Shizu [Japon] ; Hiroshi Miyazaki [Japon] ; Chihaya Adachi [Japon]Source :
- Nature materials [ 1476-1122 ] ; 2015.
Abstract
Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100%.
DOI: 10.1038/nmat4154
PubMed: 25485987
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pubmed:25485987Le document en format XML
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<author><name sortKey="Nakamura, Nozomi" sort="Nakamura, Nozomi" uniqKey="Nakamura N" first="Nozomi" last="Nakamura">Nozomi Nakamura</name>
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<author><name sortKey="Yasumatsu, Mao" sort="Yasumatsu, Mao" uniqKey="Yasumatsu M" first="Mao" last="Yasumatsu">Mao Yasumatsu</name>
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<author><name sortKey="Nakanotani, Hajime" sort="Nakanotani, Hajime" uniqKey="Nakanotani H" first="Hajime" last="Nakanotani">Hajime Nakanotani</name>
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<author><name sortKey="Shizu, Katsuyuki" sort="Shizu, Katsuyuki" uniqKey="Shizu K" first="Katsuyuki" last="Shizu">Katsuyuki Shizu</name>
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<author><name sortKey="Miyazaki, Hiroshi" sort="Miyazaki, Hiroshi" uniqKey="Miyazaki H" first="Hiroshi" last="Miyazaki">Hiroshi Miyazaki</name>
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<author><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Highly efficient blue electroluminescence based on thermally activated delayed fluorescence.</title>
<author><name sortKey="Hirata, Shuzo" sort="Hirata, Shuzo" uniqKey="Hirata S" first="Shuzo" last="Hirata">Shuzo Hirata</name>
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<author><name sortKey="Sakai, Yumi" sort="Sakai, Yumi" uniqKey="Sakai Y" first="Yumi" last="Sakai">Yumi Sakai</name>
<affiliation wicri:level="1"><nlm:affiliation>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] Research &Development Department, Dyden Corporation, 1-1 Hyakunenkouen, Kurume, Fukuoka 839-0864, Japan.</nlm:affiliation>
<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] Research &Development Department, Dyden Corporation, 1-1 Hyakunenkouen, Kurume, Fukuoka 839-0864</wicri:regionArea>
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<author><name sortKey="Masui, Kensuke" sort="Masui, Kensuke" uniqKey="Masui K" first="Kensuke" last="Masui">Kensuke Masui</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] Advanced Core Technology Laboratories, Fujifilm Corporation, 577 Ushijima, Kaisei, Ashigarakami, Kanagawa 258-8577</wicri:regionArea>
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<author><name sortKey="Tanaka, Hiroyuki" sort="Tanaka, Hiroyuki" uniqKey="Tanaka H" first="Hiroyuki" last="Tanaka">Hiroyuki Tanaka</name>
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<author><name sortKey="Lee, Sae Youn" sort="Lee, Sae Youn" uniqKey="Lee S" first="Sae Youn" last="Lee">Sae Youn Lee</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] JST, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea>
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<author><name sortKey="Nomura, Hiroko" sort="Nomura, Hiroko" uniqKey="Nomura H" first="Hiroko" last="Nomura">Hiroko Nomura</name>
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<author><name sortKey="Nakamura, Nozomi" sort="Nakamura, Nozomi" uniqKey="Nakamura N" first="Nozomi" last="Nakamura">Nozomi Nakamura</name>
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<author><name sortKey="Yasumatsu, Mao" sort="Yasumatsu, Mao" uniqKey="Yasumatsu M" first="Mao" last="Yasumatsu">Mao Yasumatsu</name>
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<author><name sortKey="Nakanotani, Hajime" sort="Nakanotani, Hajime" uniqKey="Nakanotani H" first="Hajime" last="Nakanotani">Hajime Nakanotani</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] JST, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [3] Innovative Organic Device Laboratory, Institute of Systems, Information Technologies and Nanotechnologies (ISIT), 744 Motooka, Nishi Fukuoka 819-0395</wicri:regionArea>
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<author><name sortKey="Zhang, Qisheng" sort="Zhang, Qisheng" uniqKey="Zhang Q" first="Qisheng" last="Zhang">Qisheng Zhang</name>
<affiliation wicri:level="1"><nlm:affiliation>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] JST, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.</nlm:affiliation>
<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] JST, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea>
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<author><name sortKey="Shizu, Katsuyuki" sort="Shizu, Katsuyuki" uniqKey="Shizu K" first="Katsuyuki" last="Shizu">Katsuyuki Shizu</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] JST, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea>
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<author><name sortKey="Miyazaki, Hiroshi" sort="Miyazaki, Hiroshi" uniqKey="Miyazaki H" first="Hiroshi" last="Miyazaki">Hiroshi Miyazaki</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] Nippon Steel &Sumikin Chemical Co. Ltd., 46-80, Nakabaru Sakinohama, Tobata, Kitakyushu 804-8503</wicri:regionArea>
<wicri:noRegion>Kitakyushu 804-8503</wicri:noRegion>
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<author><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>1] Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [2] JST, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819-0395, Japan [3] International Institute for Carbon Neutral Energy Research, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea>
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<front><div type="abstract" xml:lang="en">Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100%.</div>
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