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Synthesis and Green Phosphorescent OLED Device Performance of Cyanofluorene-Linked Phenylcarbazoles as Host Material

Abstract

Three isomeric bipolar host material series for green phosphorescent organic light-emitting diodes (PhOLEDs) was synthesized from a combination of cyanofluorene and N-phenylcarbazole moieties. A cyano-substituted fluorene moiety was selected as the n-type unit and N-phenylcarbazole moiety as the p-type unit. Green PhOLEDs were fabricated using bis[2-(2-pyridinyl-N)phenyl-C](acetylacetonato) iridium(III) [Ir(ppy)2(acac)] as a doped emitter. From the results of the device performance, a maximum current efficiency of 74.6 cd/A and an external quantum efficiency of 20.3 % were recorded for the [Ir(ppy)2(acac)]-based PhOLED, with the m-CF-PhCz host showing the best performance. Furthermore, the PhOLED with m-CF-PhCz host exhibited a relatively slow efficiency roll-off compared to the devices with o-CF-PhCz and p-CF-PhCz hosts. The color coordinates of the green PhOLEDs at 1000 cd/m2 were (0.36, 0.61) (o-CF-PhCz), (0.34, 0.62) (m-CF-PhCz), and (0.34, 0.62) (p-CF-PhCz), respectively.

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Publication details

The article was received on 02 Oct 2017, accepted on 14 Feb 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ03748A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Synthesis and Green Phosphorescent OLED Device Performance of Cyanofluorene-Linked Phenylcarbazoles as Host Material

    S. Wang, C. W. Lee, J. Y. Lee and S. Hwang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ03748A

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