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(a) PL spectra of a single MSCOPV (d = 4.9 μm) upon excitation with a pulsed laser (λex = 355 nm, Δ = 7 ns) with increased P. (b) Plot of PL intensity of MSCOPV versus P, showing a lasing threshold at 130.1 μJ cm–2. (c) Plot of the FSR of MSCOPV versus d–1. The red line represents least-squares fitting. (d–g) Lasing spectra of a single MSCOPV with d of (d) 2.6, (e) 3.4, (f) 4.8, and (g) 6.3 μm. Red arrows indicate the FSR.
