Long-range coupling of electron-hole pairs in spatially separated organic donor-acceptor layers.
Identifieur interne : 000030 ( Main/Exploration ); précédent : 000029; suivant : 000031Long-range coupling of electron-hole pairs in spatially separated organic donor-acceptor layers.
Auteurs : Hajime Nakanotani [Japon] ; Taro Furukawa [Japon] ; Kei Morimoto [Japon] ; Chihaya Adachi [Japon]Source :
- Science advances ; 2016.
Abstract
Understanding exciton behavior in organic semiconductor molecules is crucial for the development of organic semiconductor-based excitonic devices such as organic light-emitting diodes and organic solar cells, and the tightly bound electron-hole pair forming an exciton is normally assumed to be localized on an organic semiconducting molecule. We report the observation of long-range coupling of electron-hole pairs in spatially separated electron-donating and electron-accepting molecules across a 10-nanometers-thick spacer layer. We found that the exciton energy can be tuned over 100 megaelectron volts and the fraction of delayed fluorescence can be increased by adjusting the spacer-layer thickness. Furthermore, increasing the spacer-layer thickness produced an organic light-emitting diode with an electroluminescence efficiency nearly eight times higher than that of a device without a spacer layer. Our results demonstrate the first example of a long-range coupled charge-transfer state between electron-donating and electron-accepting molecules in a working device.
DOI: 10.1126/sciadv.1501470
PubMed: 26933691
Affiliations:
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JST, ERATO, Adachi Molecular Exciton Engineering Project, c/o Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Furukawa, Taro" sort="Furukawa, Taro" uniqKey="Furukawa T" first="Taro" last="Furukawa">Taro Furukawa</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Morimoto, Kei" sort="Morimoto, Kei" uniqKey="Morimoto K" first="Kei" last="Morimoto">Kei Morimoto</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; 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JST, ERATO, Adachi Molecular Exciton Engineering Project, c/o Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; JST, ERATO, Adachi Molecular Exciton Engineering Project, c/o Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Furukawa, Taro" sort="Furukawa, Taro" uniqKey="Furukawa T" first="Taro" last="Furukawa">Taro Furukawa</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Morimoto, Kei" sort="Morimoto, Kei" uniqKey="Morimoto K" first="Kei" last="Morimoto">Kei Morimoto</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; JST, ERATO, Adachi Molecular Exciton Engineering Project, c/o Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; JST, ERATO, Adachi Molecular Exciton Engineering Project, c/o Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.; International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author></analytic><series><title level="j">Science advances</title><idno type="e-ISSN">2375-2548</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Understanding exciton behavior in organic semiconductor molecules is crucial for the development of organic semiconductor-based excitonic devices such as organic light-emitting diodes and organic solar cells, and the tightly bound electron-hole pair forming an exciton is normally assumed to be localized on an organic semiconducting molecule. We report the observation of long-range coupling of electron-hole pairs in spatially separated electron-donating and electron-accepting molecules across a 10-nanometers-thick spacer layer. We found that the exciton energy can be tuned over 100 megaelectron volts and the fraction of delayed fluorescence can be increased by adjusting the spacer-layer thickness. Furthermore, increasing the spacer-layer thickness produced an organic light-emitting diode with an electroluminescence efficiency nearly eight times higher than that of a device without a spacer layer. Our results demonstrate the first example of a long-range coupled charge-transfer state between electron-donating and electron-accepting molecules in a working device.</div></front></TEI><affiliations><list><country><li>Japon</li></country></list><tree><country name="Japon"><noRegion><name sortKey="Nakanotani, Hajime" sort="Nakanotani, Hajime" uniqKey="Nakanotani H" first="Hajime" last="Nakanotani">Hajime Nakanotani</name></noRegion><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name><name sortKey="Furukawa, Taro" sort="Furukawa, Taro" uniqKey="Furukawa T" first="Taro" last="Furukawa">Taro Furukawa</name><name sortKey="Morimoto, Kei" sort="Morimoto, Kei" uniqKey="Morimoto K" first="Kei" last="Morimoto">Kei Morimoto</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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