Quasi-2D colloidal nanoplatelets have emerged as exciting candidates for incorporation into quantum information networks as generators of propagating (photonic) qubits. Such a function requires emission of continuous streams of single, indistinguishable photons on-demand, which means the minimization of "blinking", or fluorescence intermittency, and spectral diffusion of emission. Here, with room-temperature measurements of the photoluminescence of single colloidal nanoplatelets -- including a newly developed ratiometric measurement of the timescales of spectral diffusion and Photon Correlation Fourier Spectroscopy (PCFS) -- we show that blinking and spectral diffusion are correlated on some timescales, but not on others. These results provide evidence of two different mechanisms for these sources of line broadening, both having to do with trapping of excitonic carriers on the surfaces of the nanoplatelets.

Mechanisms of blinking and spectral diffusion in single quasi-2D colloidal nanoplatelets

ACS Spring Meeting 2021

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