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Why the durations follow a power law, instead of having one typical time, is unknown.","posed_since":"1996","precise":"Single CdSe, CdSe/CdS and CsPbBr3 nanocrystals show on and off duration distributions $P(t) \\sim t^{-\\alpha}$ with $\\alpha \\sim 1.5$ over about six decades, plus partially bright grey states. Determine the microscopic mechanism (Auger quenching in charged nanocrystals, hot-carrier trapping with fluctuating rates, diffusing energy levels of surface traps) that yields the power law and its exponent, consistent with photon statistics, lifetime-intensity correlations and suppression in thick-shell structures. An answer is a mechanism reproducing $P(t)$ and its dependence on excitation intensity.","problem_ref":null,"references":"","settled_by":"Single-particle measurements correlating blinking statistics with in situ charge state and trap spectroscopy, reproduced by a microscopic model with measured parameters.","status_note":"","title":"Origin of power-law fluorescence blinking in semiconductor 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