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Issue 17, 2016
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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

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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

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The article was received on 10 Nov 2015, accepted on 09 Dec 2015 and first published on 14 Dec 2015


Article type: Communication
DOI: 10.1039/C5TC03737A
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Citation: J. Mater. Chem. C, 2016,4, 3699-3704

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    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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