  Exciton-polariton condensation in direct bandgap semiconductors strongly
coupled to light enables a broad range of fundamental studies and applications
like low-threshold and electrically driven lasing. Yet, materials hosting
exciton-polariton condensation in ambient conditions are rare, with fabrication
protocols that are often inefficient and non-scalable. Here, room-temperature
exciton-polariton condensation and lasing is observed in a microcavity with
embedded formamidiniumlead bromide (FAPbBr$_3$) perovskite film. This optically
active material is spin-coated onto the microcavity mirror, which makes the
whole device scalable up to large lateral sizes. The sub-$\mu$m granulation of
the polycrystalline FAPbBr$_3$ film allows for observation of polariton lasing
in a single quantum-confined mode of a polaritonic 'quantum dot'. Compared to
random photon lasing, observed in bare FAPbBr$_3$ films, polariton lasing
exhibits a lower threshold, narrower linewidth, and an order of magnitude
longer coherence time. Both polariton and random photon lasing are observed
under the conditions of pulsed optical pumping, and persist without significant
degradation for up to 6 and 17 hours of a continuous experimental run,
respectively. This study demonstrates the excellent potential of the FAPbBr$_3$
perovskite as a new material for room-temperature polaritonics, with the added
value of efficient and scalable fabrication offered by the solution-based
spin-coating process.
