Random telegraph noise in photoluminescence from individual self-assembled quantum dots

Spectroscopic studies of random telegraph noise in self-assembled InP quantum dots in GaInP

“…1 Such phenomena have also been observed in other semiconductor systems such as colloidal quantum dots as well as in straininduced quantum dots. [2][3][4] As is typical for random telegraph noise, 5 the explanation is not clear.…”

Fluorescence Intermittency in Self-Assembled InP Quantum Dots

“…The former phenomenon, called as the spectral diffusion, is observed in CdSe [1][2][3][4] and InAlAs [5] QDs, where the PL peak energies from confined excitons and their LO sidebands fluctuate during the time of measurement. The latter phenomenon is referred to as the fluorescence intermittency or random telegraph signal, where the PL intensity switches between two or more discrete levels as the time goes by [1,[5][6][7][8][9]. The spectral diffusion and the fluorescence intermittency are tentatively attributed to photoionization or mobile photoactivated nonradiative recombination centers.…”

Blinking Statistics and Excitation-Dependent Luminescence Yield in Si and CdSe Nanocrystals

“…A different approach is based on the assumption that temporary non-radiative channels in or close to the quantum dot are responsible for the dark state. 10,11 There is still a heavy debate on which of the 4 two classes of models is correct, or even a combination of them. Another important question concerns the role of four-particle Auger recombination (due to simultaneous excitation of two excitons in the same nanocrystal) as the main cause for ON-OFF transitions, as opposed to a single-photon absorption mechanism or thermal processes.…”