Lead halide perovskites are excellent emitters with high quantum efficiency, which has witnessed prosperous development in light emitting applications, such as low-threshold lasers or light emitting diodes. While optically-pumped lasing in perovskites has been widely demonstrated, there is a long-term desire to achieve electrical injection, but without any success. One possible route is to strongly couple perovskite excitons with cavity photons, forming hybrid quasiparticles of exciton polaritons that could possibly lower the lasing operation density. The stepping stone will be to realize perovskite polariton light-emitting diodes working at room temperature, but they remain elusive.

In this article, the researchers demonstrate the realization of polariton light-emitting diodes with solution-processed cesium lead bromide perovskites at room temperature. By combining the perovskite light-emitting diode structure with dielectric mirrors to form a vertical cavity, the authors reveal compelling evidence of strong coupling regime with anticrossing behaviors in angle-resolved reflectivity. They further achieve a high efficiency of 5.37% and a narrower spectral bandwidth of 6.5 nm in perovskite polariton light-emitting diodes. These findings represent a crucial step towards the realization of electrically-pumped perovskite polariton lasers.

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