“…In fact, the emission spectra of CzBN3 , BNCz-DMAC , BNCz-SAF, and SPBAC-tCzBN were slightly blue-shifted relative to that of BCzBN . 187,257,279 In contrast, the emission spectra were slightly red-shifted upon the introduction of electron-withdrawing substituents (Fig. 31 and Table 36).…”
Section: Late-stage Functionalisationmentioning
confidence: 99%
“…, o-SPAC-tCzBN ). 279 The important advantage of introducing substituents is the incorporation of intersegmental CT triplet states such as the T 2 level, which accelerates RISC. This level is silently induced without perturbing the lowest excited singlet states.…”
This review highlights organoboron-based multiple-resonance compounds’ synthetic strategies classified as one-pot borylation, one-shot borylation, and late-stage functionalisation, and explores material structure–photophysical property correlations.
“…In fact, the emission spectra of CzBN3 , BNCz-DMAC , BNCz-SAF, and SPBAC-tCzBN were slightly blue-shifted relative to that of BCzBN . 187,257,279 In contrast, the emission spectra were slightly red-shifted upon the introduction of electron-withdrawing substituents (Fig. 31 and Table 36).…”
Section: Late-stage Functionalisationmentioning
confidence: 99%
“…, o-SPAC-tCzBN ). 279 The important advantage of introducing substituents is the incorporation of intersegmental CT triplet states such as the T 2 level, which accelerates RISC. This level is silently induced without perturbing the lowest excited singlet states.…”
This review highlights organoboron-based multiple-resonance compounds’ synthetic strategies classified as one-pot borylation, one-shot borylation, and late-stage functionalisation, and explores material structure–photophysical property correlations.
“…Generally, CP-MR-TADF materials are designed by integrating the opposite multiple resonance effects of electron-deficient and electron-donating atoms/groups and chirality characters (axial, helical, central and planar chirality) in one molecular framework to achieve desirable CPL properties and narrowband emissions with high quantum efficiency. 6–14 The multiple resonance effects induced by the separated frontier molecular orbital (FMO) distributions on the adjacent atoms/groups generally cause a relatively large FMO wave function overlap and thus a larger transition electric dipole moment ( μ ) to maintain a narrowband emission with high quantum efficiency; 15–21 however, the increased μ value would inevitably result in the decreased g value according to the equation , where m represents the transition magnetic dipole moment and θ μ , m is the angle between μ and m . Therefore, how to increase the g value and balance the contradictory requirements of high quantum efficiency and g value is the key in developing high-performance CP-MR-TADF materials.…”
Circularly polarized multiple-resonance thermally activated delayed fluorescence (CP-MR-TADF) materials have attracted increasing attention recently, but it is still a formidable challenge to design materials with large asymmetry factor (g), narrowband...
“…3 Following this pioneering work, numerous B, N-doped PAHs with unique structural features of suitably positioned electron-donating N atoms and electron-withdrawing B atoms are reported. 4–18 The ortho -positioned boron and nitrogen atoms having opposite resonance effects induce the localization and separation of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) on different atoms, resulting in a small singlet–triplet splitting energy (Δ E ST ) required for a reverse intersystem crossing (RISC) process in TADF materials. 3 Moreover, such materials with multiple resonance (MR) properties minimize the bonding/anti-bonding characters and molecular relaxations upon excitation, which is desired for narrowband emissions.…”
Boron/nitrogen number and position in multiple resonance-thermally activated delayed fluorescence materials have a significant influence on the structural relaxations, short-range charge transfer properties and emission colors.
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