Surface-enhanced emission from single semiconductor nanocrystals
Surface-enhanced emission from single semiconductor nanocrystals
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DOI：
10.1103/physrevlett.89.117401
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发表时间：
2002-09-09
影响因子：
8.6
通讯作者：
Bawendi, MG
中科院分区：
文献类型：
--
作者：
Shimizu, KT;Woo, WK;Bawendi, MG
单个CdSe（ZnS）核壳结构的量子点的荧光行为受到与粗糙金属膜的电磁相互作用的显著影响。观察到的变化包括单个NC的观察到的荧光强度增加五倍，其荧光闪烁行为显著减少，发射偏振完全转换为线性，以及单个NC激子寿命快>10（3）倍。增强的激发态衰减过程耦合到粗糙的金属基板的NC有效地竞争与俄歇弛豫过程，使我们能够观察到带电和中性激子发射从这些NC量子点。
The fluorescence behavior of single CdSe(ZnS) core-shell nanocrystal (NC) quantum dots is dramatically affected by electromagnetic interactions with a rough metal film. Observed changes include a fivefold increase in the observed fluorescence intensity of single NCs, a striking reduction in their fluorescence blinking behavior, complete conversion of the emission polarization to linear, and single NC exciton lifetimes that are >10(3) times faster. The enhanced excited state decay process for NCs coupled to rough metal substrates effectively competes with the Auger relaxation process, allowing us to observe both charged and neutral exciton emission from these NC quantum dots.