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Room temperature (RT) polariton condensate holds exceptional promise forrevolutionizing various fields of science and technology, encompassingoptoelectronics devices to quantum information processing. Using perovskitematerials like all-inorganic CsPbBr3 single crystal provides additionaladvantages, such as ease of synthesis, cost-effectiveness, and compatibilitywith existing semiconductor technologies. In this work, we show the formationof whispering gallery modes (WGM) in CsPbBr3 single crystals with controlledgeometry, synthesized using a lowcost and efficient capillary bridge method.Through the implementation of microplatelets geometry, we achieve enhancedoptical properties and performance thanks to the presence of sharp edges and auniform surface, effectively avoiding non-radiative scattering losses caused bydefects. This allows us not only to observe strong light matter coupling andformation of whispering gallery polaritons, but also to demonstrate the onsetof polariton condensation at RT. This investigation not only contributes to theadvancement of our knowledge concerning the exceptional optical properties ofperovskite-based polariton systems, but also unveils prospects for theexploration of WGM polariton condensation within the framework of a 3Dperovskite-based platform, working at RT. The unique characteristics ofpolariton condensate, including low excitation thresholds and ultrafastdynamics, open up unique opportunities for advancements in photonics andoptoelectronics devices.

Room temperature polariton condensation from Whispering gallery modes in CsPbBr3 microplatelets