Shimizu K T, Woo W K, Fisher B R, Eisler H J, Bawendi M G
Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2002 Sep 9;89(11):117401. doi: 10.1103/PhysRevLett.89.117401. Epub 2002 Aug 23.
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.
单个CdSe(ZnS)核壳纳米晶体（NC）量子点的荧光行为会受到与粗糙金属膜电磁相互作用的显著影响。观察到的变化包括单个NC的荧光强度增加了五倍、其荧光闪烁行为显著减少、发射偏振完全转变为线性，以及单个NC激子寿命加快了>10³倍。与粗糙金属基底耦合的NC的激发态衰减过程增强，有效地与俄歇弛豫过程竞争，使我们能够观察到这些NC量子点的带电和中性激子发射。
