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Novel furo[3,2-c]pyridine based iridium complex for high-performance organic light-emitting diodes with over 30% external quantum efficiency

Abstract

A novel furo[3,2-c]pyridine based Ir complex, namely (pfupy)2Ir(acac), has been developed by replacing sulfur with oxygen in the C^N ligand. Compared with the thiophene-containing (pthpy)2Ir(acac), the LUMO level is elevated while the HOMO level keeps almost unchanged for the resultant furan-containing (pfupy)2Ir(acac). As a consequence, the emissive maximum is blue-shifted from 556 nm of (pthpy)2Ir(acac) to 538 nm of (pfupy)2Ir(acac) together with an improved photoluminescence quantum yield of 0.80. The corresponding device based on (pfupy)2Ir(acac) realizes a record-high external quantum efficiency (EQE) of 30.5% (110.5 cd/A) without any out-coupling technology. Even at a luminance of 1000 and 5000 cd/m2, the EQE still remains at 26.6% (96.4 cd/A) and 25.6% (92.7 cd/A), respectively, indicative of the gentle efficiency roll-off. The results clearly demonstrate the great potential of furan-based functional materials applied in OLEDs.

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Publication details

The article was accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Communication
DOI: 10.1039/C7TC03937A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Novel furo[3,2-c]pyridine based iridium complex for high-performance organic light-emitting diodes with over 30% external quantum efficiency

    J. Ding, Z. Yan, Y. Wang, J. Wang, Y. Wang and L. Wang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03937A

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