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 and Chihaya Adachi ()
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Hajime Nakanotani: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Takahiro Higuchi: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Taro Furukawa: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Kensuke Masui: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Kei Morimoto: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Masaki Numata: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Hiroyuki Tanaka: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Yuta Sagara: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Takuma Yasuda: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi
Chihaya Adachi: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5016

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