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Low‐threshold nanolasers based on slab nanocrystals (SNCs) of highly emissive H‐aggregated organic semiconductors are reported. A lasing threshold as low as 100 nJ cm−2 is achieved in a high‐quality (cavity quality factor ≈ 1000) Fabry–Pérot cavity constituted by the two lateral‐faces of SNCs at the wavelength scale. Moreover, the laser light generated in the ultrasmall radial cavity of SNCs can propagate...
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