Downloads: 358

Files in This Item:
File Description SizeFormat 
ncomms9476.pdf686.88 kBAdobe PDFView/Open
Title: Purely organic electroluminescent material realizing 100% conversion from electricity to light.
Authors: Kaji, Hironori  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-5111-3852 (unconfirmed)
Suzuki, Hajime
Fukushima, Tatsuya
Shizu, Katsuyuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-1835-0418 (unconfirmed)
Suzuki, Katsuaki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-8042-9517 (unconfirmed)
Kubo, Shosei
Komino, Takeshi
Oiwa, Hajime
Suzuki, Furitsu
Wakamiya, Atsushi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1430-0947 (unconfirmed)
Murata, Yasujiro  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-0287-0299 (unconfirmed)
Adachi, Chihaya
Author's alias: 梶, 弘典
Keywords: Physical sciences
Optical physics
Materials science
Issue Date: 19-Oct-2015
Publisher: Nature Publishing Group
Journal title: Nature communications
Volume: 6
Thesis number: 8476
Abstract: 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).
Description: 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.
Rights: 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(Published Version): 10.1038/ncomms9476
PubMed ID: 26477390
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2015-10-21
Appears in Collections:Journal Articles

Show full item record

Export to RefWorks


Export Format: 


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.