On the origin of stretched exponential (Kohlrausch) relaxation kinetics in the room temperature luminescence decay of colloidal quantum dots

AbstractThe room temperature non-exponential luminescence decay of colloidal quantum dots is investigated theoretically in an attempt to identify the underlying physical mechanisms responsible for the shape of the decay. It is shown that a stretched exponential functional form of the luminescence decay can be understood in terms of long-range resonance energy transfer from quantum dots to acceptors (molecules, quantum dots, or anharmonic molecular vibrations) or by contact quenching by quenchers (surface traps, molecules or quantum dots) distributed statistically (Poisson distribution) on the surface of the dots. These non-radiative transition processes are assigned to different ranges of the stretching parameter β.

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Room-temperature luminescence decay of colloidal semiconductor quantum dots: Nonexponentiality revisited

Annalen der Physik ◽

10.1002/andp.201500350 ◽

2016 ◽

Vol 528 (3-4) ◽

pp. 272-277 ◽

Cited By ~ 30

Author(s):

Evgeny N. Bodunov ◽

Vladimir V. Danilov ◽

Anastasia S. Panfutova ◽

A. L. Simões Gamboa

Keyword(s):

Quantum Dots ◽

Room Temperature ◽

Luminescence Decay ◽

Semiconductor Quantum Dots ◽

Colloidal Semiconductor ◽

Room Temperature Luminescence

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Luminescence Decay of Colloidal Quantum Dots and Stretched Exponential (Kohlrausch) Relaxation Function

Semiconductors ◽

10.1134/s1063782618050044 ◽

2018 ◽

Vol 52 (5) ◽

pp. 587-589 ◽

Cited By ~ 3

Author(s):

E. N. Bodunov ◽

A. L. Simões Gamboa

Keyword(s):

Quantum Dots ◽

Relaxation Function ◽

Luminescence Decay ◽

Colloidal Quantum Dots ◽

Stretched Exponential

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Однофотонное излучение одиночной квантовой точки CdTeSe/ZnS в ближнем инфракрасном диапазоне при комнатной температуре

Письма в журнал технической физики ◽

10.21883/pjtf.2021.21.51618.18767 ◽

2021 ◽

Vol 47 (21) ◽

pp. 3

Author(s):

Siyue Jin ◽

Xingsheng Xu

Keyword(s):

Quantum Dots ◽

Room Temperature ◽

Auger Recombination ◽

Single Photon ◽

Irradiation Time ◽

Colloidal Quantum Dots ◽

Single Quantum ◽

Illumination Time ◽

Single Quantum Dots ◽

Single Quantum Dot

In this study, the photostability of a CdTeSe/ZnS colloidal single photon emitter with a wavelength of 800nm at room temperature was investigated. The second-order correlation function was much smaller than 0.1, which proved that the CdTeSe/ZnS single quantum dot at 800nm is a highly pure single-photon emitter. The effects of the irradiation time on the optical properties from single quantum dots were analyzed. As the illumination time increased, the emission of biexciton and multiexciton in the colloidal quantum dots increased, and the occurrence of Auger recombination increased.

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