Fig. 2.

Single-photon emitter characterization. a Lifetime measurement. The black curve is the raw data fitted with a single-exponential equation I(t)exp( − t/τ). From the fitting, τ = 0.81 ± 0.01 ns. b RT PL spectrum of the SPE 4. c Saturation behavior of the SPE 4 at different laser powers. The black curve is the raw data fitted with I(P) = I_s/(1 + P₀/P). d Fluorescence intensity trace at laser powers 1.5 mW (black) and 8.2 mW (blue) with a sampling time of 100 ms and duration 400 s at room temperature. No obvious blinking has been observed