Thermally Activated Delayed Fluorescence and Room?Temperature Phosphorescence in Sulfidoazatriangulene?Based Materials and their S?oxides

Structural constraint is an emerging strategy for improving the photoluminescence quantum yield, molar absorptivity, and color purity of luminescent materials. In this report, emitters displaying thermally activated delayed fluorescence (TADF) are achieved first time using planarized donor sulfidotetramethyazatriangulene (SMAT). Compared to non-planarized phenothiazine (PTZ) donors, enhanced rigidity SMAT contributes improved with up 90% yield observed donor–acceptor compounds in toluene solution. Planarized SMAT-based also offer tenfold enhancement two-photon absorption cross-section compared analogous PTZ-based Oxidation sulfur-containing donors sulfoxide sulfone derivatives demonstrated as a simple generalizable means tuning electron-donating ability moieties. SMAT-TRZ SOMAT-TRZ both exhibit TADF, green blue emission, respectively, while SO2MAT-TRZ displays room temperature phosphorescence. Overall, work demonstrates that its S-oxides can be used design high-performance materials emergent properties such TADF or room-temperature