Strong light matter coupling in organic semiconductors for efficient lasers and LEDs

Abstract

The unique properties of organic materials—most notably their high oscillator strengths and well-defined absorption bands—facilitate the design of practical thin-film devices in which strong exciton-photon coupling plays a central role. This coupling introduces additional tuning parameters, enabling device functionalities that are not accessible in conventional architectures. Organic polariton lasers are a prominent and widely studied example, and we present our recent contributions to ultra-low-threshold polariton lasing, motivated by the long-term objective of direct-injection-driven organic laser diodes. Beyond lasing, tailored polaritonic effects also emerge as a powerful strategy for OLEDs that combine highly saturated, narrowband emission with very good color stability across all angles of observation, thereby addressing a key challenge OLEDs face in meeting the requirements of the BT.2020 display standard. We present examples spanning red, green, blue and NIR emission, and demonstrate dramatically enhanced device performance, achieving EQEs exceeding 20%.