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The surprising recent observation of highly emissive triplet-states in leadhalide perovskites accounts for their orders-of-magnitude brighter opticalsignals and high quantum efficiencies compared to other semiconductors. Thismakes them attractive for future optoelectronic applications, especially inbright low-threshold nano-lasers. Whilst non-resonantly pumped lasing fromall-inorganic lead-halide perovskites is now well-established as an attractivepathway to scalable low-power laser sources for nano-optoelectronics, here weshowcase a resonant optical pumping scheme on a fast triplet-state in CsPbBr3nanocrystals. The scheme allows us to realize a polarized triplet-laser sourcethat dramatically enhances the coherent signal by one order of magnitude whilstsuppressing non-coherent contributions. The result is a source with highlyattractive technological characteristics including a bright and polarizedsignal, and a high stimulated-to-spontaneous emission signal contrast that canbe filtered to enhance spectral purity. The emission is generated by pumpingselectively on a weakly-confined excitonic state with a Bohr radius ~10 nm inthe nanocrystals. The exciton fine-structure is revealed by theenergy-splitting resulting from confinement in nanocrystals with tetragonalsymmetry. We use a linear polarizer to resolve two-fold non-degeneratesub-levels in the triplet exciton and use photoluminescence excitationspectroscopy to determine the energy of the state before pumping it resonantly.

Resonantly pumped bright-triplet exciton lasing in caesium lead bromide perovskites