Efficiency and operation lifetime of blue triplet‐triplet annihilation organic light emitting diodes (TTA‐OLEDs) were enhanced by 16% and 297%, respectively, by employing double emitting layer structure. Blue OLED with maximum external quantum efficiency of 9.4% and half‐lifetime of 96,620 hours at initial luminance of 1,000 cd/m2 was achieved.
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