Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.



Sulfur atom contained ligands induced rapid room temperature synthesis of red iridium(III) complexes with Ir-S-P-S structures for OLEDs

Abstract

Two novel sulfur atom contained ligands (triethylamine salts of di-p-tolylphosphinodithioic acid (mess) and di(naphthalen-1-yl)phosphinodithioic acid (niss)) were firstly developed for red iridium(III) complexes (tfmpqz)2Ir(mess) and (tfmpqz)2Ir(niss) with Ir-S-P-S four membered ring structures, in which 4-(4-(trifluoromethyl)phenyl)-quinazoline (tfmpqz) was used as cyclometalated ligand. Both Ir(III) complexes were obtained rapidly at room temperature in 5 min with high yields due to the strong coordination ability of S atom with iridium atom, and the calculated Gibbs free energy changes of both complexes formation reactions further prove that they are exothermic and thermodynamically beneficial processes. They show similar PL emissions at 623 and 619 nm with high phosphorescence quantum yields of 0.62 and 0.65, respectively. Using the two complexes as dopants, both organic light emitting devices (OLEDs) with the structure of ITO/ HATCN (hexaazatriphenylenehexacabonitrile, 5 nm)/ TAPC ((bis(4-(N,N-ditolylamino)phenyl)cyclohexane, 30 nm)/ (tfmpqz)2Ir(mess) or (tfmpqz)2Ir(niss): 26DCzppy (2,6-bis-(3-(carbazol-9-yl)phenyl)pyridine) (12 wt%, 10 nm)/ TmPyPB (1,3,5-tri((3-pyridyl)-phen-3-yl)benzene, 30 nm)/ LiF (1 nm)/ Al (100 nm) achieve good performances. Especially, the device using (tfmpqz)2Ir(niss) complex exhibits better device performances with the maximum luminance of 43 643 cd m-2, the maximum current efficiency of 31.32 cd A-1, the maximum power efficiency of 22.35 lm W-1 and the maximum external quantum efficiency of 19.90%.

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 Mar 2019, accepted on 05 May 2019 and first published on 06 May 2019


Article type: Paper
DOI: 10.1039/C9NJ01599J
New J. Chem., 2019, Accepted Manuscript

  •   Request permissions

    Sulfur atom contained ligands induced rapid room temperature synthesis of red iridium(III) complexes with Ir-S-P-S structures for OLEDs

    N. Su, H. Yang, Y. Zheng and Z. Chen, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ01599J

Search articles by author

Spotlight

Advertisements