About the seminar:

Photoluminescence intermittency also referred to as blinking is an inherent property and a
common problem that reduces the brightness and stability of single colloidal quantum dots.
Despite efforts to achieve blinking reduction through chemical engineering of the QD
architecture and its environment, blinking still limits the QD applications such as single
particle tracking and single photon emission. It is, however, possible to have an all-optical
suppression of the blinking using mid-infrared and visible excitation. The moderate ultrafast
mid-infrared pulses (5.5 µm, 150 fs) can switch the emission from a charged, low quantum
yield grey trion state to the bright exciton state in CdSe/CdS core-shell QDs, which results in
a significant reduction of the QD blinking. This approach can be easily applied to existing
single-particle tracking or super-resolution microscopy techniques without any modification
to the sample and can be extended to other emitters such as two-dimensional materials that
suffer from charge-induced blinking