20‐4: Highly Reliable Blue Phosphor‐Sensitized Fluorescent Tandem Organic Light‐Emitting Diode Utilizing Spontaneous Orientation Polarization in Electron‐Transport Layer

The recombination region in a light‐emitting layer in a blue phosphorescent organic light‐emitting diode (OLED) was controlled through spontaneous orientation polarization in an electron‐transport layer. We developed a blue phosphor‐sensitized OLED using a fluorescent material whose quenching due to Dexter energy transfer is inhibited. A high‐luminance and high‐reliability tandem OLED employing both technologies was achieved.