Positive feedback organic photodiodes and upconverters

This talk will explore a new class of organic light-emitting diode (OLED) that exhibits bistability owing to positive photonic feedback between an organic photodiode integrated in the same layer stack as a tandem OLED. These unusual devices exhibit giant hysteresis in both their current and light emission and respond sensitively to low-level external illumination, enabling optoelectronic upconversion with thousand-fold photon-to-photon gain. These devices may find use in new types of display and upconversion imaging applications as well as provide a new platform for neuromorphic optoelectronics and image recognition.