24‐4: Investigation of Effect of Triplet‐Triplet Annihilation and Molecular Orientation on External Quantum Efficiency of Ultrahigh‐Efficiency Blue Fluorescent Device

Abstract

The effects of triplet‐triplet annihilation (TTA) and molecular orientation were quantitatively investigated for a high‐efficiency blue fluorescent organic light‐emitting diode. Both the efficient TTA generation by improving carrier balance and the horizontal orientation of the transition dipole moment of the blue dopant realized ultrahigh external quantum efficiency (approximately 12%).