Optically Pumped\nPolaritons in Perovskite Light-Emitting\nDiodes

Abstract

Lead halide perovskites have achieved significant progress\nin light-emitting\ndiodes (LEDs) with high efficiency in the past few decades. They are\nalso ideal candidates for reaching the strong exciton–photon\ncoupling regime due to their large exciton binding energy and oscillator\nstrength. The generation and control of exotic phenomena in perovskite\nelectroluminescent microcavities, such as electrically pumped polariton\nlasing and polariton LEDs, operating in the strong coupling regime\nat room temperature, is still a great challenge. Here, we demonstrate\nroom-temperature strong coupling in a perovskite LED structure. The\nbest device shows a current efficiency of 4.5 cd/A and an external\nquantum efficiency of 1.4% while exhibiting anticrossing behavior\nvia optical pumping. Our approach represents a new strategy to explore\nultrafast LEDs as well as electrically pumped perovskite lasing.