  Exciton polaritons, hybrid quasiparticles with part-light part-matter nature
in semiconductor microcavities, are extensively investigated for striking
phenomena such as polariton condensation and quantum emulation. These phenomena
have recently been discovered in emerging lead halide perovskites at elevated
temperatures up to room temperature. For advancing these discoveries into
practical applications, one critical requirement is the realization of
electrically pumped exciton-polaritons. However, electrically pumped polariton
light-emitting devices with perovskites have not yet been achieved
experimentally. Here, we devise a new method to combine the device with the
microcavity and report the first halide perovskite polariton light-emitting
device. Specifically, the device is based on a CsPbBr3 capacitive structure,
which can inject the electrons and holes from the same electrode, conducive to
the formation of excitons and simultaneously maintaining the high quality of
the microcavity. In addition, highly polarization-selective polariton emissions
have been demonstrated due to the optical birefringence in the CsPbBr3
microplate. This work paves the way for realizing practical polaritonic devices
such as high-speed light-emitting devices for information communications and
inversionless electrically pumped lasers based on perovskites.
