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Iridium(III) phosphors with bis(diphenylphorothioyl)amide ligand for efficient green and sky-blue OLEDs with EQE nearly 28%

Abstract

In this study a new ligand, bis(diphenylphorothioyl)amide (Stpip), containing phoshpor-sulfur (P=S) bonds was invented as an ancillary ligand. Four iridium(III) complexes (Ir(ppy)2(Stpip), Ir(tfppy)2(Stpip), Ir(ttppy)2(Stpip) and Ir(tntppy)2(Stpip) with phenylpyridine derivates (ppy = 2-phenylpyridine; tfppy = 2-[4-(trifluoromethyl)phenyl]pyridine; ttppy = 2-[3,5-bis(trifluoromethyl)phenyl]pyridine; tntppy = 2-[2,6-bis(trifluoromethyl)-4-pyridyl]pyridine) as the main ligands were investigated. Due to the stable S-Ir bonds, these complexes emit green or sky-blue photoluminescence with high quantum yields (Ir(ppy)2(Stpip): λmax = 490 nm,  = 44.7%; Ir(tfppy)2(Stpip): λmax = 495 nm,  = 85.4%; Ir(ttppy)2(Stpip): λmax = 477 nm,  = 92.1%; Ir(tntppy)2(Stpip): λmax = 516 nm,  = 90.8%) and good thermal stability. Using these compounds as emitters, all organic light-emitting devices (OLEDs) showed decent performances. Notably, device with Ir(tfppy)2(Stpip) emitter achieved the maximum luminance of 37 977 cd cm-2, as well as current efficiency, power efficiency and external quantum efficiency of 73.6 cd A-1, 52.5 lm W-1 and 25.9%, respectively. And the device with Ir(ttppy)2(Stpip) complex exhibited the highest EQE up to nearly 28%. These results show that bis(diphenylphorothioyl)amide is a promising ancillary ligand for efficient phosphorescent Ir(III) complexes and OLEDs.

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Publication details

The article was received on 10 May 2018, accepted on 30 Jul 2018 and first published on 02 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC02265H
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Iridium(III) phosphors with bis(diphenylphorothioyl)amide ligand for efficient green and sky-blue OLEDs with EQE nearly 28%

    J. Xia, X. Liang, Z. Yan, Z. Wu, Y. Zhao, Y. Zheng and W. Zhang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC02265H

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