Photoluminescence dynamics of ensemble and individual CdSe/ZnS quantum dots with an alloyed core/shell interface

Ratchford, Daniel; Dziatkowski, K.; Hartsfield, Thomas; Li, Xiaoqin; Gao, Yan; Tang, Zhiyong

doi:10.1063/1.3587168

Cited by 34 publications

(40 citation statements)

References 49 publications

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“…[22][23][24] Further experimental supports for IET and its applications can be found here. [25][26][27][28][29][30][31][32][33] Moreover, the importance of ionic valence states on the electronic transport properties of oxides and magnetic semiconductors was first experimentally proven by Mahendiran et al, 34 the computational (using the Density Functional Theory) proof was given by Mahadevan and Zunger, 35 while the theoretical proofs (using IET) have been developed in ref. 36.…”

Section: Ionization Energy Approximationmentioning

confidence: 99%

Nucleotide insertion initiated by van der Waals interaction during polymerase beta DNA replication

Arulsamy¹

2013

J Chem Sci

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We present here an unambiguous theoretical analyses and to show that the exclusive biochemical reaction involved in a single nucleotide insertion into the DNA primer can be efficiently tracked using the renormalized van der Waals (vdW) interaction of a stronger type, the Hermansson blue-shifting hydrogen bond effect, and the Arunan composite hydrogen-vdW bond. We find that there are two biochemical steps involved to complete the insertion of a single base (cytosine) into the 3 end of a DNA primer. First, the O3 (from a DNA primer) initiates the nucleophilic attack on P α (from an incoming dCTP), in response, O3 α (bonded to P α) interacts with H (bonded to O3). These interactions are shown to be strongly interdependent and require the forming and breaking of P-O and H-O covalent bonds, which in turn imply that we do not need any external energy supply.

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Section: Ionization Energy Approximationmentioning

confidence: 99%

Nucleotide insertion initiated by van der Waals interaction during polymerase beta DNA replication

Arulsamy¹

2013

J Chem Sci

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“…A multi-exponential model is commonly used to fit F(t), and the number of exponential decay terms varies widely in the literature. 5,8,14,21,[23][24][25][26][27] In ref. 27, Nadeau et al used the one-state trapping model with three fitting parameters to fit the fluorescence decay spectra of mercaptopropionic acid (MPA) coated CdTe QDs under the influence of b-mercaptoethanol (BME), while the fitted data did not display clear relationships with the changes (pH value and BME concentration) in the QD solutions (note that the stretched model and two-exponential model were also used for comparison).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of fluorescence decays of colloidal CdSe–CdS/ZnS quantum dots unraveled by time-resolved fluorescence measurement

Chmyrov

Widengren

et al. 2015

Phys. Chem. Chem. Phys.

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By narrowing the detection bandpass and increasing the signal-to-noise ratio in measuring the time-resolved fluorescence decay spectrum of colloidal CdSe-CdS/ZnS quantum dots (QDs), we show that directly after the photoexcitation, the fluorescence decay spectrum is characterized by a single exponential decay, which represents the energy relaxation of the photogenerated exciton from its initial high-energy state to the ground exciton state. The fluorescence decay spectrum of long decay time is in the form of β/t(2), where β is the radiative recombination time of the ground-state exciton and t is the decay time. Our findings provide us with a direct and quantitative link between fluorescence decay measurement data and fundamental photophysics of QD exciton, thereby leading to a novel way of applying colloidal QDs to study microscopic, physical and chemical processes in many fields including biomedicine.

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“…The QY of ZnCdSeS QDs can be calculated as 64%, using Rhodamine 6G as reference 18 . Unlike core-shell CdSe/ZnS QDs, ZnCdSeS QDs lead to lower confinement of the electron wave-function and high degree of surface accessibility by photo-induced electrons, achieving a relatively high QY 19 . Fig.…”

Section: Resultsmentioning

confidence: 99%

All Solution-processed Stable White Quantum Dot Light-emitting Diodes with Hybrid ZnO@TiO2 as Blue Emitters

Chen

Zhao

et al. 2014

Sci Rep

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White quantum dot light-emitting diodes (QD-LEDs) have been a promising candidate for high-efficiency and color-saturated displays. However, it is challenging to integrate various QD emitters into one device and also to obtain efficient blue QDs. Here, we report a simply solution-processed white QD-LED using a hybrid ZnO@TiO2 as electron injection layer and ZnCdSeS QD emitters. The white emission is obtained by integrating the yellow emission from QD emitters and the blue emission generated from hybrid ZnO@TiO2 layer. We show that the performance of white QD-LEDs can be adjusted by controlling the driving force for hole transport and electroluminescence recombination region via varying the thickness of hole transport layer. The device is demonstrated with a maximum luminance of 730 cd/m2 and power efficiency of 1.7 lm/W, exhibiting the Commission Internationale de l'Enclairage (CIE) coordinates of (0.33, 0.33). The unencapsulated white QD-LED has a long lifetime of 96 h at its initial luminance of 730 cd/m2, primarily due to the fact that the device with hybrid ZnO@TiO2 has low leakage current and is insensitive to the oxygen and the moisture. These results indicate that hybrid ZnO@TiO2 provides an alternate and effective approach to achieve high-performance white QD-LEDs and also other optoelectronic devices.

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Photoluminescence dynamics of ensemble and individual CdSe/ZnS quantum dots with an alloyed core/shell interface

Cited by 34 publications

References 49 publications

Nucleotide insertion initiated by van der Waals interaction during polymerase beta DNA replication

Nucleotide insertion initiated by van der Waals interaction during polymerase beta DNA replication

Mechanisms of fluorescence decays of colloidal CdSe–CdS/ZnS quantum dots unraveled by time-resolved fluorescence measurement

All Solution-processed Stable White Quantum Dot Light-emitting Diodes with Hybrid ZnO@TiO2 as Blue Emitters

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