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Four-membered Red Iridium(iii) Complexes With Ir-S-P-S Structures: Rapid Room-Temperature Synthesis and Application in OLEDs

Four-membered Red Iridium(iii) Complexes With Ir-S-P-S Structures: Rapid Room-Temperature Synthesis and Application in OLEDs

Ning Su, You-Xuan Zheng

Dalton Trans. 2019 Jun 14;48(22):7583-7588.

PMID: 31066420

Abstract:

In this work, with sulfur-containing ancillary ligands of triethylamine salts of bis(4-methoxyphenyl)-phosphinodithioic acid (omess) and bis(3,5-di-tert-butyl-4-methoxyphenyl)phosphinodithioic acid (tbuss), two four-membered red iridium(iii) complexes (tfmpqz)2Ir(omess) and (tfmpqz)2Ir(tbuss) with Ir-S-P-S structures were synthesized rapidly at room temperature within 5 min, in which 4-(4-(trifluoromethyl)phenyl)quinazoline (tfmpqz) was used as the main ligand. The calculated Gibbs free energy changes of the complex formation reactions prove that they are exothermic and thermodynamically beneficial processes. Both Ir(iii) complexes show almost the same PL emissions at 624 and 623 nm with high phosphorescence quantum yields of 0.60 and 0.72, respectively. Using the two complexes as emitters, 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(omess) or (tfmpqz)2Ir(tbuss):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. Particularly, due to the introduction of tert-butyl groups into the (tfmpqz)2Ir(tbuss) complex, its device exhibits better device properties with a maximum luminance of 26 184 cd m-2, maximum current efficiency of 30.24 cd A-1, maximum power efficiency of 22.61 lm W-1 and maximum external quantum efficiency of 21.50% with CIE coordinates at (0.65, 0.34).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1013405247	26DCzPPy		1013405-24-7	Price
AP921205030	TmPyPB		921205-03-0	Price

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