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Photoluminescence blinking¡ªrandom switching between states of high (ON) and low (OFF) emissivities¡ªis a universal property of molecular emitters found in dyes1, polymers2, biological molecules3 and artificial nanostructures such as nanocrystal quantum dots, carbon nanotubes and nanowires4¨C6. For the past 15 years, colloidal nanocrystals have been used as a model system to study this phenomenon5,6. The occurrence of OFF periods in nanocrystal emission has been commonly attributed to the presence of an additional charge7, which leads to photoluminescence quenching by nonradiative recombination (the Auger mechanism)8. However, this ¡®charging¡¯ model was recently challenged in several reports9,10.Here we report time-resolved photoluminescence studies of
individual nanocrystal quantum dots performed while electrochemically controlling the degree of their charging, with the goal of clarifying the role of charging in blinking. We find that two distinct types of blinking are possible: conventional (A-type) blinking due to charging and discharging of the nanocrystal core, in which lower photoluminescence intensities correlate with shorter photoluminescence lifetimes; and a second sort (B-type), in which large changes in the emission intensity are not accompanied by significant changes in emission dynamics. We attribute B-type blinking to charge fluctuations in the electron-accepting surface
sites. When unoccupied, these sites intercept ¡®hot¡¯ electrons before they relax into emitting core states. Both blinking mechanisms can be electrochemically controlled and completely suppressed by application of an appropriate potential.










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