Purely organic electroluminescent material realizing 100% conversion from electricity to light

Hironori Kaji (), Hajime Suzuki, Tatsuya Fukushima, Katsuyuki Shizu, Katsuaki Suzuki, Shosei Kubo, Takeshi Komino, Hajime Oiwa, Furitsu Suzuki, Atsushi Wakamiya, Yasujiro Murata and Chihaya Adachi ()
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Hironori Kaji: Institute for Chemical Research, Kyoto University
Hajime Suzuki: Institute for Chemical Research, Kyoto University
Tatsuya Fukushima: Institute for Chemical Research, Kyoto University
Katsuyuki Shizu: Institute for Chemical Research, Kyoto University
Katsuaki Suzuki: Institute for Chemical Research, Kyoto University
Shosei Kubo: Institute for Chemical Research, Kyoto University
Takeshi Komino: Center for Organic Photonics and Electronics Research, Kyushu University
Hajime Oiwa: Institute for Chemical Research, Kyoto University
Furitsu Suzuki: Institute for Chemical Research, Kyoto University
Atsushi Wakamiya: Institute for Chemical Research, Kyoto University
Yasujiro Murata: Institute for Chemical Research, Kyoto University
Chihaya Adachi: Center for Organic Photonics and Electronics Research, Kyushu University

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9476

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