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SUMMARY:Fluorescence Blinking Control in Quantum Dots with Ultrafast Mid-in
 frared Pulses
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20251120T160000
UID:2026-05-07-04-46-48@natsci.colostate.edu
DTSTAMP:20260507T044648
Description:About the seminar:\n\nPhotoluminescence intermittency also refe
 rred to as blinking is an inherent property and a\ncommon problem that red
 uces the brightness and stability of single colloidal quantum dots.\nDespi
 te efforts to achieve blinking reduction through chemical engineering of t
 he QD\narchitecture and its environment\, blinking still limits the QD app
 lications such as single\nparticle tracking and single photon emission. It
  is\, however\, possible to have an all-optical\nsuppression of the blinki
 ng using mid-infrared and visible excitation. The moderate ultrafast\nmid-
 infrared pulses (5.5 µm\, 150 fs) can switch the emission from a charged\
 , low quantum\nyield grey trion state to the bright exciton state in CdSe/
 CdS core-shell QDs\, which results in\na significant reduction of the QD b
 linking. This approach can be easily applied to existing\nsingle-particle 
 tracking or super-resolution microscopy techniques without any modificatio
 n\nto the sample and can be extended to other emitters such as two-dimensi
 onal materials that\nsuffer from charge-induced blinking 4:00 pm
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