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Abstract
AbstractWe report high‐efficiency fluorescent red OLEDs with 11.5% EQE (15 cd/A) at 3 V, and yellow OLEDs with 8.6% EQE (28 cd/A) at 2.9 V. This performance was obtained using a nonemitting assist layer adjacent to the emission layer, and low‐voltage electron‐transporting and electron‐injecting layers. Time‐resolved electroluminescence measurements indicate a significant efficiency contribution (up to 50%) from triplet—triplet annihilation processes.
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