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Methoxyl modification in furo[3,2-c]pyridine based iridium complexes towards highly efficient green- and orange-emitting electrophosphorescent devices

Abstract

Two new furo[3,2-c]pyridine based Ir complexes, namely (4-MeOpfupy)2Ir(acac) and (3-MeOpfupy)2Ir(acac), have been designed and synthesized by introducing methoxyl into the 4- and 3-position of phenyl ring on the C^N ligand. It is found that the position of methoxyl plays an important role on the electrochemical and photophysical properties as well as electrophosphorescent device performance. Compared to the reference complex (pfupy)2Ir(acac) without any methoxyl (538 nm), (4-MeOpfupy)2Ir(acac) with 4-position methoxyl shows a blue-shifted emission peaked at 523 nm originating from the methoxyl-induced enhancement of the LUMO level, whereas (3-MeOpfupy)2Ir(acac) with 3-position methoxyl shows a red-shifted emission peaked at 602 nm originating from the methoxyl-induced enhancement of the HOMO level. The corresponding PhOLEDs based on (4-MeOpfupy)2Ir(acac) and (3-MeOpfupy)2Ir(acac) realize highly efficient green and orange electroluminescence with CIE coordinates of (0.37, 0.60) and (0.60, 0.40), revealing a state-of-art EQE as high as 29.5% (100.7 cd/A) and 16.7% (43.9 cd/A), respectively. The impressive results indicate that methoxyl modification is a valid way to tune the molecular energy levels and emissive color for Ir complexes while not obviously sacrificing the final device performance.

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Publication details

The article was received on 19 Sep 2017, accepted on 06 Nov 2017 and first published on 08 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04269H
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Methoxyl modification in furo[3,2-c]pyridine based iridium complexes towards highly efficient green- and orange-emitting electrophosphorescent devices

    J. Ding, Z. Yan, Y. Wang, Y. Wang and L. Wang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC04269H

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