Blue organic light-emitting diode with a turn-on voltage of 1.47 V

Seiichiro Izawa (), Masahiro Morimoto (), Keisuke Fujimoto (), Koki Banno, Yutaka Majima, Masaki Takahashi, Shigeki Naka and Masahiro Hiramoto
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Seiichiro Izawa: Tokyo Institute of Technology
Masahiro Morimoto: University of Toyama
Keisuke Fujimoto: Shizuoka University
Koki Banno: Shizuoka University
Yutaka Majima: Tokyo Institute of Technology
Masaki Takahashi: Shizuoka University
Shigeki Naka: University of Toyama
Masahiro Hiramoto: Institute for Molecular Science

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Among the three primary colors, blue emission in organic light-emitting diodes (OLEDs) are highly important but very difficult to develop. OLEDs have already been commercialized; however, blue OLEDs have the problem of requiring a high applied voltage due to the high-energy of blue emission. Herein, an ultralow voltage turn-on at 1.47 V for blue emission with a peak wavelength at 462 nm (2.68 eV) is demonstrated in an OLED device with a typical blue-fluorescent emitter that is widely utilized in a commercial display. This OLED reaches 100 cd/m2, which is equivalent to the luminance of a typical commercial display, at 1.97 V. Blue emission from the OLED is achieved by the selective excitation of the low-energy triplet states at a low applied voltage by using the charge transfer (CT) state as a precursor and triplet-triplet annihilation, which forms one emissive singlet from two triplet excitons.

Date: 2023
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DOI: 10.1038/s41467-023-41208-7

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