Benzothiophene-fused and bulky donor-shielded blue multiple-resonance emitters for fluorescent OLEDs with improved operational stability

Three t-DABNA-derived blue multiple-resonance (MR) fluorescent emitters, tDAt, BT-tDAt and BT-DPA-tDAt, were developed to clarify the roles of benzothiophene fusion and bulky diarylamine shielding in narrowband blue OLED dopants.