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分享一篇牛人发在Nature上的文章：量子点发光淬灭机理的讨论
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量子点的荧光猝灭机理一直难以得到一个完整的结论，这篇文章对量子点的荧光猝灭机理给出了详细的讨论与解释，希望对做量子点的虫子有帮助！！！ Photoluminescence blinking—random switching between states of high (ON) and low (OFF) emissivities—is a universal property of molecular emitters found in dyes1, polymers2, biological molecules3 and artificial nanostructures such as nanocrystal quantum dots, carbon nanotubes and nanowires4–6. 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.    [ 来自科研家族 梦家园 ][ Last edited by 发光二极管 on 2012-5-29 at 22:32 ] |
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2012-05-29 13:07:20, 634.79 K
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自己顶一个吧！2楼2012-05-29 11:53:38
有专业人士来了！ 我的确没有太仔细看这篇文章，我不是做量子点的，只是大致看了下这个东西好像发光性质有时间相应，可能在光开关上有应用
4楼2012-05-29 13:01:54