“…Over the last few years, an intense researche ffort has been focused on the design and synthesis of thermally activated delayed fluorescence (TADF) materials [1][2][3][4][5] liable of converting the excited T 1 states to emissive S 1 states by absorbing environmental thermal energy through an efficient reverse intersystem crossing( RISC). [6] Although aw ealth of highly efficient blue [7][8][9] green, [10][11][12] yellow [13,14] and orange [15,16] TADF emitters are presently available, the progress on achieving long-lived fluorophores emitting in the deep red part of the visible spectrum has unfortunately been slowed because it requires the optimization of contrasting properties [17][18][19][20] The improved understanding of the processes ruling the effectiveness of RISC process has already revealed some basic design principles on develop-ing highly-effective red TADF emitters [21][22][23][24] In this regard, the most effectives trategy entails the synthesis of dyads with strong, rigid, chemically stable and sterically hindered donor and acceptorm oieties spaceda part and twisted from each other through p-linker units [25][26][27][28][29][30][31] These integrated molecular platformsf ulfil the photophysical and electronic key requirementst oe nhance TADF process, such as:1 )low singlet-triplet energyg ap;2 )ane lectronic coupling betweend onor and acceptorn either too strong nor too weak to enableboth forward and reverse ISC processes; [28] 3) al arge fluorescence rate constant;a nd 4) ah igh chemical, photochemical, and photophysical stabilityo ft he molecular building blocks.…”