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A terpyridine-modified chrysene derivative as an electron transporter to improve the lifetime in phosphorescent OLEDs

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Abstract

In this work, we designed and developed a terpyridine-modified chrysene derivative, abbreviated as B3TPyC, to be used as electron-transport layers (ETLs) toward the construction of highly stable phosphorescent OLEDs. A green phosphorescent OLED with a B3TPyC ETL exhibited a low turn-on voltage of 2.4 V at 1 cd m−2 and an external quantum efficiency of 17.5% at 1000 cd m−2 with a long operation lifetime at 50% of the initial luminance (LT50) of over 258 h at current density 25 mA cm−2 (an initial luminance of approximately 12 000 cd m−2), which corresponds to a LT50 of 19 000 h at 1000 cd m−2. This is more than 1.5 times longer than the time of luminance decay provided by the phenylpyridine counterpart named B3PyPC. These results clearly show the potential and usefulness of terpyridine-based chrysene derivatives to be applied in high-performance OLEDs with high operational stability.

Graphical abstract: A terpyridine-modified chrysene derivative as an electron transporter to improve the lifetime in phosphorescent OLEDs

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Article information


Submitted
21 Nov 2019
Accepted
27 Jan 2020
First published
04 Feb 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

A terpyridine-modified chrysene derivative as an electron transporter to improve the lifetime in phosphorescent OLEDs

T. Owada, H. Sasabe, Y. Sukegawa, T. Watanabe, T. Maruyama, Y. Watanabe, D. Yokoyama and J. Kido, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06393E

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