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High-performance organic light-emitting diodes with low-efficiency roll-off using bulky tetradentate [Pt(O^N^C^N)] emitters

Abstract

High-performance organic light-emitting diodes (OLEDs) were realized by utilizing three robust platinum(II) complexes bearing tetradentate O^N^C^N ligands with a bridging tertiary amine (tetra-Pt-N), a biphenyl group with a spiro linkage (tetra-Pt-S) or a sterically encumbered 2,6-dimethyl-4-tert-butylphenyl moiety (tetra-Pt-M). By using a double-host emissive layer (EML) structure and a 10-nm-thick interlayer between the EML and the electron-transport layer (ETL), a maximum power efficiency of over 100 lm/W, a low turn-on voltage of less than 2.5 V and small efficiency roll-off were achieved. High external quantum efficiency (EQE) of 19.4% and 20.3% were maintained at 10000 cd/m2 in OLEDs with tetra-Pt-N and tetra-Pt-M, respectively. Such high efficiency at high luminance could be attributed to the effective suppression of triplet-triplet annihilation (TTA) in our optimized device structure.

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Publication details

The article was received on 04 Feb 2019, accepted on 09 Apr 2019 and first published on 11 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC00682F
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    High-performance organic light-emitting diodes with low-efficiency roll-off using bulky tetradentate [Pt(O^N^C^N)] emitters

    M. Mao, J. Peng, T. L. Lam, W. Ang, H. Li, G. Cheng and C. Che, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC00682F

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