Realization of high-efficiency fluorescent organic light-emitting diodes with low driving voltage

Amin Salehi, Chen Dong, Dong-Hun Shin, Liping Zhu, Christopher Papa, Anh Thy Bui, Felix N. Castellano and Franky So ()
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Amin Salehi: North Carolina State University
Chen Dong: North Carolina State University
Dong-Hun Shin: North Carolina State University
Liping Zhu: North Carolina State University
Christopher Papa: North Carolina State University
Anh Thy Bui: North Carolina State University
Felix N. Castellano: North Carolina State University
Franky So: North Carolina State University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract It is commonly accepted that a full bandgap voltage is required to achieving efficient electroluminescence (EL) in organic light-emitting diodes. In this work, we demonstrated organic molecules with a large singlet-triplet splitting can achieve efficient EL at voltages below the bandgap voltage. The EL originates from delayed fluorescence due to triplet fusion. Finally, in spite of a lower quantum efficiency, a blue fluorescent organic light-emitting diode having a power efficiency higher than some of the best thermally activated delayed fluorescent and phosphorescent blue organic light-emitting diodes is demonstrated. The current findings suggest that leveraging triplet fusion from purely organic molecules in organic light-emitting diode materials offers an alternative route to achieve stable and high efficiency blue organic light-emitting diodes.

Date: 2019
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DOI: 10.1038/s41467-019-10260-7

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