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タイトル: | Purely organic electroluminescent material realizing 100% conversion from electricity to light. |
著者: | Kaji, Hironori https://orcid.org/0000-0002-5111-3852 (unconfirmed) Suzuki, Hajime Fukushima, Tatsuya Shizu, Katsuyuki https://orcid.org/0000-0002-1835-0418 (unconfirmed) Suzuki, Katsuaki https://orcid.org/0000-0001-8042-9517 (unconfirmed) Kubo, Shosei Komino, Takeshi Oiwa, Hajime Suzuki, Furitsu Wakamiya, Atsushi https://orcid.org/0000-0003-1430-0947 (unconfirmed) Murata, Yasujiro https://orcid.org/0000-0003-0287-0299 (unconfirmed) Adachi, Chihaya |
著者名の別形: | 梶, 弘典 |
キーワード: | Physical sciences Optical physics Materials science |
発行日: | 19-Oct-2015 |
出版者: | Nature Publishing Group |
誌名: | Nature communications |
巻: | 6 |
論文番号: | 8476 |
抄録: | Efficient organic light-emitting diodes have been developed using emitters containing rare metals, such as platinum and iridium complexes. However, there is an urgent need to develop emitters composed of more abundant materials. Here we show a thermally activated delayed fluorescence material for organic light-emitting diodes, which realizes both approximately 100% photoluminescence quantum yield and approximately 100% up-conversion of the triplet to singlet excited state. The material contains electron-donating diphenylaminocarbazole and electron-accepting triphenyltriazine moieties. The typical trade-off between effective emission and triplet-to-singlet up-conversion is overcome by fine-tuning the highest occupied molecular orbital and lowest unoccupied molecular orbital distributions. The nearly zero singlet-triplet energy gap, smaller than the thermal energy at room temperature, results in an organic light-emitting diode with external quantum efficiency of 29.6%. An external quantum efficiency of 41.5% is obtained when using an out-coupling sheet. The external quantum efficiency is 30.7% even at a high luminance of 3, 000 cd m(-2). |
記述: | 効率100%で電気を光に変換する有機EL材料の高性能化に成功. 京都大学プレスリリース. 2015-10-21. |
著作権等: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
URI: | http://hdl.handle.net/2433/200697 |
DOI(出版社版): | 10.1038/ncomms9476 |
PubMed ID: | 26477390 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2015-10-21 |
出現コレクション: | 学術雑誌掲載論文等 |
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