High Efficiency and Low Roll‐Off Blue and White Organic Light‐Emitting Diodes Enabled by Pyrene‐Based Blue Emitters via Efficient Triplet–Triplet Annihilation

Blue organic light‐emitting diodes (OLEDs) continue to face significant challenges due to the scarcity of stable and efficient blue‐emitting materials. This study presents four fluorescent blue emitters based on a pyrene core with high photoluminescence quantum yield (PLQY) and longevity. By incorporating these emitters as dopants in anthracene‐based hosts with highly efficient triplet–triplet annihilation, we achieved blue OLEDs with a maximum external quantum efficiency (EQE) of 8.9% and a champion LT 70 lifetime (decay to 70% of an initial luminance at 1000 cd/m 2 ) of 111.6 h. Furthermore, we combined the blue emitters with yellow, green, and red phosphorescent emitters to obtain white OLEDs with a maximum EQE of 17.2% and a color rendering index of 88. Our results highlight the potential of these blue emitters in boosting the performance of both blue and white OLEDs.