Transient Fluorescence of the Off State in Blinking CdSe/CdS/ZnS Semiconductor Nanocrystals Is Not Governed by Auger Recombination

Rosen, Shamir; Schwartz, Osip; Oron, Dan

doi:10.1103/physrevlett.104.157404

Cited by 159 publications

(181 citation statements)

References 22 publications

Supporting

Mentioning

164

Contrasting

Order By: Relevance

“…As an extension of this framework, multiply charged states were suggested in order to account for a dark-state quantum yield much lower than its biexcitonic counterpart. 29 Multiply charged states are also consistent with the distribution of lifetimes in the dark state 38 as well as the present findings on the distribution of dark intensity states. The wide distribution of bright intensity states reported in this paper could be due to an alternative mechanism of fluctuating non-radiative channels.…”

Section: Implications Of the Distributed States On Models Of Blinkingsupporting

confidence: 77%

“…Indeed, the present findings contribute to the growing body of evidence supporting a multi-state picture of blinking. 3, 13, 32, 37-39 Emission lifetime measurements in CdSe/ZnS QDs have demonstrated that the off state can be further resolved into a manifold of states 38,39 which is consistent with the evidence indicating a distribution of dark intensity states (Fig. 2).…”

Section: Implications Of the Distributed States On Models Of Blinkingsupporting

confidence: 69%

See 1 more Smart Citation

Two-state theory of binned photon statistics for a large class of waiting time distributions and its application to quantum dot blinking

Volkan-Kacso

2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

A theoretical method is proposed for the calculation of the photon counting probability distribution during a bin time. Two-state fluorescence and steady excitation are assumed. A key feature is a kinetic scheme that allows for an extensive class of stochastic waiting time distribution functions, including power laws, expanded as a sum of weighted decaying exponentials. The solution is analytic in certain conditions, and an exact and simple expression is found for the integral contribution of "bright" and "dark" states. As an application for power law kinetics, theoretical results are compared with experimental intensity histograms from a number of blinking CdSe/ZnS quantum dots. The histograms are consistent with distributions of intensity states around a "bright" and a "dark" maximum. A gap of states is also revealed in the more-or-less flat inter-peak region. The slope and to some extent the flatness of the inter-peak feature are found to be sensitive to the power-law exponents. Possible models consistent with these findings are discussed, such as the combination of multiple charging and fluctuating non-radiative channels or the multiple recombination center model. A fitting of the latter to experiment provides constraints on the interaction parameter between the recombination centers. Further extensions and applications of the photon counting theory are also discussed. © 2014 AIP Publishing LLC. [http://dx

show abstract

Section: Implications Of the Distributed States On Models Of Blinkingsupporting

confidence: 77%

Section: Implications Of the Distributed States On Models Of Blinkingsupporting

confidence: 69%

Two-state theory of binned photon statistics for a large class of waiting time distributions and its application to quantum dot blinking

Volkan-Kacso

2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…Furthermore, we have shown that both trion charge states and concomitantly their charged biexcitons have high luminescence quantum yields, contrary to observations at room temperature 25 , indicating that Auger recombination is inefficient in these materials. Thus the photo-charging mechanism of our NCs can be attributed to a tunnelling process, which has significant implications for alternative photoluminescenceblinking mechanisms 41,42 . Another interesting consequence of NC engineering is revealed in the g-factor measurements.…”

Section: Discussionmentioning

confidence: 99%

Magneto-optical properties of trions in non-blinking charged nanocrystals reveal an acoustic phonon bottleneck

et al. 2012

View full text Add to dashboard Cite

Charged quantum dots provide an important platform for a range of emerging quantum technologies. Colloidal quantum dots in particular offer unique advantages for such applications (facile synthesis, manipulation and compatibility with a wide range of environments), especially if stable charged states can be harnessed in these materials. Here we engineer the CdSe nanocrystal core and shell structure to efficiently ionize at cryogenic temperatures, resulting in trion emission with a single sharp zero-phonon line and a mono exponential decay. Magneto-optical spectroscopy enables direct determination of electron and hole g-factors. Spin relaxation is observed in high fields, enabling unambiguous identification of the trion charge. Importantly, we show that spin flips are completely inhibited for Zeeman splittings below the low-energy bound for confined acoustic phonons. This reveals a characteristic unique to colloidal quantum dots that will promote the use of these versatile materials in challenging quantum technological applications.

show abstract

“…However, charging of NCs can promote Auger recombination and trap states can bind charge Colloidal lead halide perovskite nanocrystals H Huang et al carriers, preventing recombination, all of which has been considered to contribute to blinking. [102][103][104] Tian et al 98 observed PL blinking from MAPbI 3 nanorods (Figures 8h-j) and attributed it to photo-induced activation and de-activation of PL quenching sites, presumably present at the ends of the rods where formation of geometrical and chemical defects are most likely to occur. Similarly, blinking was also observed in single perovskite MAPbBr 3 NCs and attributed to the presence of charge trapping surface states.…”

Section: Quantum Confinement In Perovskite Ncsmentioning

confidence: 99%

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

et al. 2016

View full text Add to dashboard Cite

Lead halide perovskite nanocrystals (NCs) are receiving a lot of attention nowadays, due to their exceptionally high photoluminescence quantum yields reaching almost 100% and tunability of their optical band gap over the entire visible spectral range by modifying composition or dimensionality/size. We review recent developments in the direct synthesis and ion exchange-based reactions, leading to hybrid organic-inorganic (CH 3 NH 3 PbX 3 ) and all-inorganic (CsPbX 3 ) lead halide (X = Cl, Br, I) perovskite NCs, and consider their optical properties related to quantum confinement effects, single emission spectroscopy and lasing. We summarize recent developments on perovskite NCs employed as an active material in several applications such as light-emitting devices, solar cells and photodetectors, and provide a critical outlook into the existing and future challenges.

show abstract

Transient Fluorescence of the Off State in Blinking CdSe/CdS/ZnS Semiconductor Nanocrystals Is Not Governed by Auger Recombination

Cited by 159 publications

References 22 publications

Two-state theory of binned photon statistics for a large class of waiting time distributions and its application to quantum dot blinking

Two-state theory of binned photon statistics for a large class of waiting time distributions and its application to quantum dot blinking

Magneto-optical properties of trions in non-blinking charged nanocrystals reveal an acoustic phonon bottleneck

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

Contact Info

Product

Resources

About