Issue 17, 2016

Synthesis, properties, and OLED characteristics of 2,2′-bipyridine-based electron-transport materials: the synergistic effect of molecular shape anisotropy and a weak hydrogen-bonding network on molecular orientation

Abstract

To boost the performances of OLEDs, one of the most promising approaches from a materials chemistry viewpoint is the use of thin solid films with horizontal molecular orientations. In this work, we developed 2,2′-bipyridine-skeleton-based electron-transport materials (ETMs) end-capped with 3,5-dipyridylphenyl groups with the objective of preparing films with horizontal molecular orientations for use in high-performance organic light-emitting devices (OLEDs). These compounds afforded highly oriented films and were used in fac-tris(2-phenylpyridine)iridium(III)-based OLEDs as ETMs. The optimized device exhibited low operating voltages of 2.8 and 3.2 V at luminances of 100 and 1000 cd m−2, respectively. At 1000 cd m−2, this device exhibited a power efficiency of 74 lm W−1 and an external quantum efficiency of 21%.

Graphical abstract: Synthesis, properties, and OLED characteristics of 2,2′-bipyridine-based electron-transport materials: the synergistic effect of molecular shape anisotropy and a weak hydrogen-bonding network on molecular orientation

Supplementary files

Article information

Article type
Communication
Submitted
10 Nov. 2015
Accepted
09 Dec. 2015
First published
14 Dec. 2015

J. Mater. Chem. C, 2016,4, 3699-3704

Author version available

Synthesis, properties, and OLED characteristics of 2,2′-bipyridine-based electron-transport materials: the synergistic effect of molecular shape anisotropy and a weak hydrogen-bonding network on molecular orientation

Y. Watanabe, H. Sasabe, D. Yokoyama, T. Beppu, H. Katagiri and J. Kido, J. Mater. Chem. C, 2016, 4, 3699 DOI: 10.1039/C5TC03737A

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