Achieving\nTunable\nMonomeric TADF and Aggregated RTP\nvia Molecular Stacking

Organic emitters with both thermally\nactivated delayed\nfluorescence\n(TADF) and room-temperature phosphorescence (RTP) have attracted widespread\ninterest for their intriguing luminescent properties. Herein, a series\nof triphenylamine-substituted isoquinoline derivatives possessing\nmonomeric TADF and aggregated RTP properties are reported. As the\nmolecules exhibited various forms of π–π and charge\ntransfer (CT) stacking with different intensities, inter/intramolecular\nCT can be meticulously modulated to achieve tunable TADF-RTP. Aggregated\nphosphorescence originates from intermolecular CT initiated by CT\ndimers, whereas monomeric TADF is facilitated by intramolecular CT\nenhanced by π–π dimers. Leveraging the properties\nof these molecules, luminescent materials with tunable TADF-RTP properties\nin multistates are obtained by molecular substitution position alignment,\ndealing with different solvents, grinding, adjusting concentration,\nchanging polymer matrix, photoactivation, and heat treatment. This\nwork is critical for a deeper understanding of construction and regulation\nof the TADF-RTP dual-channel emission, enabling the development of\nadvanced optoelectronic devices with tailored emission properties.