Peripheral decoration of multi-resonance TADF emitter for narrowband blue OLEDs

Asymmetric multiple resonance thermally activated delayed fluorescence emitters for sky-blue and pure blue electroluminescence

“…MR-TADF emitters have become a focal point of research attention due to their potential to reconcile the confluence of high efficiency and emission color purity. 30–32 In principle, the introduction of electron donors (such as di- tert -butylcarbazole 33 and tert -diphenylamine 34 ) into the para -carbon position of B -substituted phenyl rings can depress the HOMO energy level, and slightly change that of the LUMO, thereby increasing the energy band gap between the HOMO and LUMO levels ( E g ) and blue-shifting emission. Moreover, in the same molecule, the replacement of N atoms with oxygen or sulfur (B/N/O and B/N/S) can regulate the emission of MR-TADF materials, and the positions of both oxygen and sulfur atoms will also affect the photophysical properties.…”

A diphenylphosphine oxide decorated multi-resonance TADF emitter for narrowband green electroluminescence with an EQE of 32.4%

“…11–15 For instance, by introducing different diarylamino moieties into the para -position of the boron (B) atom on the classic MR emitter, two blue MR-TADF emitters with improved optoelectrical properties were developed by our group recently. 16 In another study, Wang et al reported that attaching electron-withdrawing groups on the para -position of the B atom can not only achieve red-shifted emission, but also balance the charge transport of the emitter. 17 To date, several electron-withdrawing groups, such as cyano, triazine, pyridine, ketone, and sulfone, have been introduced to a well-known molecule, DtBCzB , for developing high-performance pure green emitters.…”