25th Anniversary Article: Colloidal Quantum Dot Materials and Devices: A Quarter‐Century of Advances

Kim, Jin Young; Voznyy, Oleksandr; Zhitomirsky, David; Sargent, Edward H.

doi:10.1002/adma.201301947

Cited by 451 publications

(335 citation statements)

References 217 publications

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“…These matrix-free QDs form stable suspensions that enable the direct application in solution-based techniques such as spin-coating, inkjet printing, and roll-to-roll casting. 21 Basically, the liquid-phase approach can be divided into two types: the aqueous-based approaches and nonaqueous-based approaches. The nonaqueous-approaches were rst developed by employing organic solvents and organometallic precursors, which enables the ne-controlled synthesis of QDs.…”

Section: Introductionmentioning

confidence: 99%

Determination of particle size distribution of water-soluble CdTe quantum dots by optical spectroscopy

et al. 2014

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In the present study, we report the synthesis of glutathione (GSH) capped CdTe quantum dots (QDs) using the one-pot approach as well as their optical properties. These QDs were used as a probe for a detailed quantitative correlation between spectroscopic data and QDs size dispersion. We have developed a spectroscopic method to determine the size dispersion of QDs in solution based on the fluorescence spectroscopy and the fluorescence quantum yields. Our results demonstrate that the one-pot approach produces GSH-capped CdTe QDs of narrow size dispersion, as inferred by the sharp line width (full width at half maximum) of the fluorescence signal (from 153 meV to 163 meV), as revealed by our spectroscopy method. We observed that the GSH-capped CdTe QDs cause an increase in fluorescence quantum yield from 11% to 30% concomitantly with an increase in lifetime decay from 38 to 50 ns during the course of synthesis (from 15 min to 120 min), indicating an increase in the average size of the QDs. Finally, we have used the evolving factor analysis together with the multivariate curve resolutionalternating least squares method to corroborate our results, and we found a good agreement between both methods with the advantage that in our method, we were able to obtain size dispersion rather than just the mean QD size.

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Section: Introductionmentioning

confidence: 99%

Determination of particle size distribution of water-soluble CdTe quantum dots by optical spectroscopy

et al. 2014

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“…S emiconductor nanocrystals or colloidal quantum dots (CQDs) and their heterostructures that can be synthesized by versatile solution chemistry are being considered for advancing multiple areas of technology 1,2 . In particular, core/shell heterostructures with type I straddling band offset exhibiting high photoluminescence (PL) quantum yields show much promise in imaging 3 , lighting 4,5 and display [6][7][8][9][10][11] applications.…”

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confidence: 99%

Double-heterojunction nanorods

et al. 2014

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As semiconductor heterostructures play critical roles in today's electronics and optoelectronics, the introduction of active heterojunctions can impart new and improved capabilities that will enable the use of solution-processable colloidal quantum dots in future devices. Such heterojunctions incorporated into colloidal nanorods may be especially promising, since the inherent shape anisotropy can provide additional benefits of directionality and accessibility in band structure engineering and assembly. Here we develop doubleheterojunction nanorods where two distinct semiconductor materials with type II staggered band offset are both in contact with one smaller band gap material. The double heterojunction can provide independent control over the electron and hole injection/ extraction processes while maintaining high photoluminescence yields. Light-emitting diodes utilizing double-heterojunction nanorods as the electroluminescent layer are demonstrated with low threshold voltage, narrow bandwidth and high efficiencies.

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“…1 The size-tunable band gap, , of CQDs coupled with the low-cost methods by which they can be fabricated and processed makes them attractive for a number of different applications. These include acting as the luminophores in efficient light sources, 2 and as the photo-absorbing species in image processing devices 3 and third-generation solar cells.…”

Section: Introductionmentioning

confidence: 99%

Multiple Exciton Generation and Dynamics in InP/CdS Colloidal Quantum Dots

et al. 2017

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We report measurements of multiple exciton generation and recombination in InP/CdS (core/shell) colloidal quantum dots. Ultrafast transient absorption spectroscopy was used to measure the sub-nanosecond charge dynamics for a range of pump fluences and for different pump photon energies. Analysis of the resulting transients was used to determine the quantum yield of multiple exciton generation, which was found to be 1.22 ± 0.01 for a pump photon energy equivalent to three times the band gap.

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25th Anniversary Article: Colloidal Quantum Dot Materials and Devices: A Quarter‐Century of Advances

Cited by 451 publications

References 217 publications

Determination of particle size distribution of water-soluble CdTe quantum dots by optical spectroscopy

Determination of particle size distribution of water-soluble CdTe quantum dots by optical spectroscopy

Double-heterojunction nanorods

Multiple Exciton Generation and Dynamics in InP/CdS Colloidal Quantum Dots

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