UV polaritonic emission from a perovskite-based microcavity

We report on the realization of a molecule-based one-dimensional microcavity emitting in the near UV range at room temperature. The active material is a thin film of the two-dimensional perovskite ${\left({\text{C}}_6{\text{H}}_5{\text{C}}_2{\text{H}}_4–{\text{NH}}_3\right)}_2{\text{PbCl}}_4$ , a molecular compound absorbing and emitting light around 3.6 eV. Angle-resolved reflectivity and photoluminescence measurements show that this microcavity works in the strong coupling regime. The emitting UV polariton is a mixed state between the photon cavity mode and the exciton of the perovskite-type semiconductor.