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Delayed fluorescence from inverted singlet and triplet excited states.
Aizawa, Naoya; Pu, Yong-Jin; Harabuchi, Yu; Nihonyanagi, Atsuko; Ibuka, Ryotaro; Inuzuka, Hiroyuki; Dhara, Barun; Koyama, Yuki; Nakayama, Ken-Ichi; Maeda, Satoshi; Araoka, Fumito; Miyajima, Daigo.
Afiliación
  • Aizawa N; RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan. aizawa@chem.eng.osaka-u.ac.jp.
  • Pu YJ; Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Japan. aizawa@chem.eng.osaka-u.ac.jp.
  • Harabuchi Y; Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Kawaguchi, Japan. aizawa@chem.eng.osaka-u.ac.jp.
  • Nihonyanagi A; RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan. yongjin.pu@riken.jp.
  • Ibuka R; Graduate School of Organic Materials Science, Yamagata University, Yonezawa, Japan. yongjin.pu@riken.jp.
  • Inuzuka H; Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, Japan.
  • Dhara B; Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Japan.
  • Koyama Y; RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.
  • Nakayama KI; RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.
  • Maeda S; RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.
  • Araoka F; RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.
  • Miyajima D; RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.
Nature ; 609(7927): 502-506, 2022 09.
Article en En | MEDLINE | ID: mdl-36104553
Hund's multiplicity rule states that a higher spin state has a lower energy for a given electronic configuration1. Rephrasing this rule for molecular excited states predicts a positive energy gap between spin-singlet and spin-triplet excited states, as has been consistent with numerous experimental observations over almost a century. Here we report a fluorescent molecule that disobeys Hund's rule and has a negative singlet-triplet energy gap of -11 ± 2 meV. The energy inversion of the singlet and triplet excited states results in delayed fluorescence with short time constants of 0.2 µs, which anomalously decrease with decreasing temperature owing to the emissive singlet character of the lowest-energy excited state. Organic light-emitting diodes (OLEDs) using this molecule exhibited a fast transient electroluminescence decay with a peak external quantum efficiency of 17%, demonstrating its potential implications for optoelectronic devices, including displays, lighting and lasers.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2022 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2022 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido