Difluorodithieno[3, 2-a:2′, 3′-c]phenazine as a strong acceptor for materials displaying thermally activated delayed fluorescence or room temperature phosphorescence. (June 2021)

• Record Type: Journal Article
• Authors: Cardeynaels, Tom; Paredis, Simon; Danos, Andrew; Harrison, Alastair; Deckers, Jasper; Brebels, Sonny; Lutsen, Laurence; Vanderzande, Dirk; Monkman, Andrew P.; Champagne, Benoît; Maes, Wouter
• Is Part Of: Dyes and pigments. Volume 190(2021)
• Publication Date: 2021-06
• Subjects: 9, 10-difluorodithieno[3, 2-a:2′, 3′-c]phenazine -- Thermally activated delayed fluorescence -- Room temperature phosphorescence -- Charge-transfer emission -- Quantum-chemical calculations -- Time-resolved spectroscopy; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2021.109301
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A novel strong electron-acceptor unit, 9, 10-difluorodithieno[3, 2- a :2′, 3′- c ]phenazine (DTPz), is synthesized and applied in the design of two donor-acceptor type emitters displaying long-lived delayed emission. Using either 9, 9-dimethyl-9, 10-dihydroacridine (DMAC) or triisopropyl-substituted benzo[1, 2- b :4, 5- b' ]dithiophene (BDT-TIPS) as the donor component, push-pull type chromophores exhibiting charge-transfer emission are obtained and found to afford either thermally activated delayed fluorescence (TADF) for DMAC or room temperature phosphorescence (RTP) for BDT-TIPS. Graphical abstract: Image 1 Highlights: Difluorodithieno[3, 2- a :2′, 3′- c ]phenazine (DTPz) is applied as acceptor in TADF materials. The time-resolved photophysical properties are studied. Quantum-chemical analysis is used to estimate the charge-transfer character. Different emission mechanisms are found (TADF vs RTP). Room temperature phosphorescence occurs from a local DTPz state.