High-efficiency organic light-emitting diodes with fluorescent emitters

Hajime Nakanotani; Takahiro Higuchi; Taro Furukawa; Kensuke Masui; Kei Morimoto; Masaki Numata; Hiroyuki Tanaka; Yuta Sagara; Takuma Yasuda; Chihaya Adachi

doi:10.1038/ncomms5016

High-efficiency organic light-emitting diodes with fluorescent emitters

Hajime Nakanotani, Takahiro Higuchi, Taro Furukawa, Kensuke Masui, Kei Morimoto, Masaki Numata, Hiroyuki Tanaka, Yuta Sagara, Takuma Yasuda, Chihaya Adachi

Applied Chemistry

Research output: Contribution to journal › Article › peer-review

745 Citations (Scopus)

Abstract

Fluorescence-based organic light-emitting diodes have continued to attract interest because of their long operational lifetimes, high colour purity of electroluminescence and potential to be manufactured at low cost in next-generation full-colour display and lighting applications. In fluorescent molecules, however, the exciton production efficiency is limited to 25% due to the deactivation of triplet excitons. Here we report fluorescence-based organic light-emitting diodes that realize external quantum efficiencies as high as 13.4-18% for blue, green, yellow and red emission, indicating that the exciton production efficiency reached nearly 100%. The high performance is enabled by utilization of thermally activated delayed fluorescence molecules as assistant dopants that permit efficient transfer of all electrically generated singlet and triplet excitons from the assistant dopants to the fluorescent emitters. Organic light-emitting diodes employing this exciton harvesting process provide freedom for the selection of emitters from a wide variety of conventional fluorescent molecules.

Original language	English
Article number	4016
Journal	Nature communications
Volume	5
DOIs	https://doi.org/10.1038/ncomms5016
Publication status	Published - May 29 2014

All Science Journal Classification (ASJC) codes

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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10.1038/ncomms5016

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@article{53b431973e7943ce8325ab9dac5de31c,

title = "High-efficiency organic light-emitting diodes with fluorescent emitters",

abstract = "Fluorescence-based organic light-emitting diodes have continued to attract interest because of their long operational lifetimes, high colour purity of electroluminescence and potential to be manufactured at low cost in next-generation full-colour display and lighting applications. In fluorescent molecules, however, the exciton production efficiency is limited to 25% due to the deactivation of triplet excitons. Here we report fluorescence-based organic light-emitting diodes that realize external quantum efficiencies as high as 13.4-18% for blue, green, yellow and red emission, indicating that the exciton production efficiency reached nearly 100%. The high performance is enabled by utilization of thermally activated delayed fluorescence molecules as assistant dopants that permit efficient transfer of all electrically generated singlet and triplet excitons from the assistant dopants to the fluorescent emitters. Organic light-emitting diodes employing this exciton harvesting process provide freedom for the selection of emitters from a wide variety of conventional fluorescent molecules.",

author = "Hajime Nakanotani and Takahiro Higuchi and Taro Furukawa and Kensuke Masui and Kei Morimoto and Masaki Numata and Hiroyuki Tanaka and Yuta Sagara and Takuma Yasuda and Chihaya Adachi",

note = "Funding Information: This work was supported in part by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) and the International Institute for Carbon Neutral Energy Research (WPI-I2CNER) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT). We thank Ms Nozomi Nakamura and Mr Hiroshi Miyazaki for synthesis and purification of organic materials. We also thank W. Potscavage for his assistance with preparation of this manuscript.",

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month = may,

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doi = "10.1038/ncomms5016",

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T1 - High-efficiency organic light-emitting diodes with fluorescent emitters

AU - Nakanotani, Hajime

AU - Higuchi, Takahiro

AU - Furukawa, Taro

AU - Masui, Kensuke

AU - Morimoto, Kei

AU - Numata, Masaki

AU - Tanaka, Hiroyuki

AU - Sagara, Yuta

AU - Yasuda, Takuma

AU - Adachi, Chihaya

N1 - Funding Information: This work was supported in part by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) and the International Institute for Carbon Neutral Energy Research (WPI-I2CNER) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT). We thank Ms Nozomi Nakamura and Mr Hiroshi Miyazaki for synthesis and purification of organic materials. We also thank W. Potscavage for his assistance with preparation of this manuscript.

PY - 2014/5/29

Y1 - 2014/5/29

N2 - Fluorescence-based organic light-emitting diodes have continued to attract interest because of their long operational lifetimes, high colour purity of electroluminescence and potential to be manufactured at low cost in next-generation full-colour display and lighting applications. In fluorescent molecules, however, the exciton production efficiency is limited to 25% due to the deactivation of triplet excitons. Here we report fluorescence-based organic light-emitting diodes that realize external quantum efficiencies as high as 13.4-18% for blue, green, yellow and red emission, indicating that the exciton production efficiency reached nearly 100%. The high performance is enabled by utilization of thermally activated delayed fluorescence molecules as assistant dopants that permit efficient transfer of all electrically generated singlet and triplet excitons from the assistant dopants to the fluorescent emitters. Organic light-emitting diodes employing this exciton harvesting process provide freedom for the selection of emitters from a wide variety of conventional fluorescent molecules.

AB - Fluorescence-based organic light-emitting diodes have continued to attract interest because of their long operational lifetimes, high colour purity of electroluminescence and potential to be manufactured at low cost in next-generation full-colour display and lighting applications. In fluorescent molecules, however, the exciton production efficiency is limited to 25% due to the deactivation of triplet excitons. Here we report fluorescence-based organic light-emitting diodes that realize external quantum efficiencies as high as 13.4-18% for blue, green, yellow and red emission, indicating that the exciton production efficiency reached nearly 100%. The high performance is enabled by utilization of thermally activated delayed fluorescence molecules as assistant dopants that permit efficient transfer of all electrically generated singlet and triplet excitons from the assistant dopants to the fluorescent emitters. Organic light-emitting diodes employing this exciton harvesting process provide freedom for the selection of emitters from a wide variety of conventional fluorescent molecules.

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High-efficiency organic light-emitting diodes with fluorescent emitters

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