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Issue 33, 2018
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Iridium(III) phosphors with bis(diphenylphorothioyl)amide ligand for efficient green and sky-blue OLEDs with EQE of nearly 28%

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Abstract

In this study, a new ligand, bis(diphenylphorothioyl)amide (Stpip), containing phosphorus–sulfur (P[double bond, length as m-dash]S) bonds was synthesized 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 emitted green or sky-blue photoluminescence with high quantum yields (Ir(ppy)2(Stpip): λmax = 490 nm, Φ = 44.7%; Ir(tfppy)2(Stpip): λmax = 495 nm, Φ = 85.4%; Ir(ttppy)2(Stpip): λmax = 477 nm, Φ = 92.1%; Ir(tntppy)2(Stpip): λmax = 516 nm, Φ = 90.8%) and good thermal stability. Using these compounds as emitters, all organic light-emitting devices (OLEDs) showed satisfactory performances. Notably, the device with the Ir(tfppy)2(Stpip) emitter achieved a maximum luminance of 37 321 cd cm−2 as well as maximum current efficiency, power efficiency and external quantum efficiency of 61.7 cd A−1, 48.5 lm W−1 and 21.8%, respectively. Moreover, the device with the Ir(ttppy)2(Stpip) complex exhibited the highest EQE value of nearly 28%. These results showed that bis(diphenylphorothioyl)amide is a promising ancillary ligand for efficient phosphorescent Ir(III) complexes and OLEDs.

Graphical abstract: Iridium(iii) phosphors with bis(diphenylphorothioyl)amide ligand for efficient green and sky-blue OLEDs with EQE of nearly 28%

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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, 2018,6, 9010-9016
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    Iridium(III) phosphors with bis(diphenylphorothioyl)amide ligand for efficient green and sky-blue OLEDs with EQE of nearly 28%

    J. Xia, X. Liang, Z. Yan, Z. Wu, Y. Zhao, Y. Zheng and W. Zhang, J. Mater. Chem. C, 2018, 6, 9010
    DOI: 10.1039/C8TC02265H

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