Organic Polarized Light‐Emitting Transistors

Abstract Electrically driven polarized light‐emitting sources are central to various applications including quantum computers, optical communication, and 3D displays, but serious challenges remain due to the inevitable incorporation of complex optical elements in conventional devices. Here, organic polarized light‐emitting transistors (OPLETs), a kind of novel device that integrates the functions of organic field‐effect transistors, organic light‐emitting diodes, and polarizers into one unique device, are demonstrated with a degree of polarization (DOP) as high as 0.97, which is comparable to completely linearly polarized light (DOP = 1). Under the modulation of gate voltage, robust and efficient polarization emission is proven, ascribed to the intrinsic in‐plane anisotropy of the molecular transition dipole moment in organic semiconductors and the open‐ended feature of OPLETs instead of other factors. As a result, high‐contrast optical imaging and anti‐counterfeiting security are successfully demonstrated based on OPLETs, establishing a new direction for photonic and electronic integration toward on‐chip miniaturized optoelectronic applications.