Thiphenylmethane based structural fragments as building blocks towards solution-processable heteroleptic iridium(iii) complexes for OLED use. (23rd November 2018)

• Record Type: Journal Article
• Authors: Traskovskis, Kaspars; Ruduss, Armands; Kokars, Valdis; Mihailovs, Igors; Lesina, Natalija; Vembris, Aivars
• Is Part Of: New journal of chemistry. Volume 43:Number 1(2019)
• Page Start: 37
• Page End: 47
• Publication Date: 2018-11-23
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj04484h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Functionalization with 1, 1, 1-triphenylmethylpentane groups can be used for heteroleptic iridium(iii ) complexes in order to obtain solution-processable OLED emitters. Abstract : A novel structural approach to solution-processable heteroleptic iridium(iii ) complexes is presented. On the basis of 2-arylbenzo[ d ]thiazole cyclometalating main ligands and picolinic acid (pic) and acetylacetone (acac) ancillary ligands six new yellow or orange emitting materials were obtained using attached 1, 1, 1-triphenylmethylpentane substituents as aggregation preventing and solubility enhancing functional fragments. The obtained compounds show high photoluminescence quantum yield values in the range of 0.64 to 0.90. OLEDs with a spin-coated emissive layer were successfully prepared, with the highest achieved external quantum efficiency of 7.9%, current efficiency of 12.4 cd A −1 and power efficiency of 7.8 lm W −1, measured at luminance 6000 cd m −2 . Maximal device brightness of 17 451 cd m −2 was attained.