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Issue 24, 2019
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Fast synthesis of iridium(iii) complexes with sulfur-containing ancillary ligand for high-performance green OLEDs with EQE exceeding 31%

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Abstract

Three green iridium(III) cyclometalated complexes, namely, (4tfmppy)2Ir(dipdtc), (24btfmppy)2Ir(dipdtc), and (TN4T)2Ir(dipdtc), with the sulfur-containing ancillary ligand N,N-diisopropyldithiocarbamate (dipdtc) were synthesized within 15 min at room temperature. The emission colors (λpeak = 497–534 nm) and photoluminescence quantum efficiencies (ΦP = 71.6–94.2%) can be effectively regulated by introducing different main ligands, namely, 2-(4-(trifluoromethyl)phenyl)pyridine (4tfmppy), 2-(2,4-bis(trifluoromethyl)phenyl)pyridine (24btfmppy), and 2′,6′-bis(trifluoromethyl)-2,4′-bipyridine (TN4T). Employing these complexes as emitters, organic light-emitting diodes (OLEDs) with double-emitting layers were fabricated. In particular, the device based on the (TN4T)2Ir(dipdtc) complex showed superior performances with maximum current efficiency of 86.59 cd A−1 and maximum external quantum efficiency of 31.24% with low efficiency roll-off. These results suggest that the Ir(III) complexes with a four-membered ring Ir–S–C–S backbone containing dipdtc have potential applications in OLEDs.

Graphical abstract: Fast synthesis of iridium(iii) complexes with sulfur-containing ancillary ligand for high-performance green OLEDs with EQE exceeding 31%

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Publication details

The article was received on 14 Mar 2019, accepted on 07 May 2019 and first published on 07 May 2019


Article type: Paper
DOI: 10.1039/C9TC01397K
J. Mater. Chem. C, 2019,7, 7273-7278

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    Fast synthesis of iridium(III) complexes with sulfur-containing ancillary ligand for high-performance green OLEDs with EQE exceeding 31%

    G. Lu, Z. Tu, L. Liu, W. Zhang and Y. Zheng, J. Mater. Chem. C, 2019, 7, 7273
    DOI: 10.1039/C9TC01397K

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