Applications of colloidal quantum dots

Sun, Kening; Vasudev, Milana; Jung, Hyeson; Yang, Jianfu; Kar, Abhijit; Li, Yang; Reinhardt, Kitt; Snee, Preston T.; Stroscio, Michael A.; Dutta, Mitra

doi:10.1016/j.mejo.2008.06.033

Cited by 43 publications

(29 citation statements)

References 27 publications

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“…In the OFF state, the plot of ln( I ) vs. V 1/2 from 0 to −0.5 V is fitted to a straight linear (inset in Figure 4 d). Such a linear characteristic indicates that the conduction mechanism probably comes from the thermionic emission,21 arising from the low injection efficiency because of the large barrier between the electrodes and BPQD‐PVP active layer 23. During this process, the charge injection from electrode to the active layer is dominant.…”

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confidence: 99%

Black Phosphorus Quantum Dots

et al. 2015

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As a unique two-dimensional nanomaterial, layered black phosphorus (BP) nanosheets have shown promising applications in electronics. Although mechanical exfoliation was successfully used to prepare BP nanosheets, it is still a challenge to produce novel BP nanostructures in high yield. A facile top-down approach for preparation of black phosphorus quantum dots (BPQDs) in solution is presented. The obtained BPQDs have a lateral size of 4.9 AE 1.6 nm and thickness of 1.9 AE 0.9 nm (ca. 4 AE 2 layers). As a proof-ofconcept application, by using BPQDs mixed with polyvinylpyrrolidone as the active layer, a flexible memory device was successfully fabricated that exhibits a nonvolatile rewritable memory effect with a high ON/OFF current ratio and good stability.Two-dimensional (2D) layered materials, such as graphene and transition-metal dichalcogenides (TMDs), have emerged as a class of promising nanomaterials in both fundament studies and potential applications owing to their intriguing properties. [1] Besides the 2D layered structure, ultra-small quantum dot (QD), as another form of nanomaterials, exhibits unique electronic and optical properties owing to the quantum confinement and edge effects. [2] For example, graphene and MoS 2 QDs have been successfully prepared and widely used in photovoltaic devices, [3] opto-electronics, [4] and biological analysis. [5] Inspired by the unique 2D feature of graphene and TMDs, considerable efforts have been devoted to the exploration of new members in the 2D family. As a typical example, black phosphorus (BP), a conceptually new layered material, has triggered a recent resurgence of interest owing to its unique structure as well as fascinating optical and electronic properties. [6] As bulk BP consists of puckered layers stacked together by weak van der Waals interactions, the mechanical exfoliation method has been successfully used to prepare single-and few-layer BP nanosheets. [6a, 7] Importantly, BP has a layerdependent bandgap, which can be tuned from 0.3 to 2 eV as its thickness decreased from bulk to monolayer. [6c, 8] The appealing tunable bandgap of BP holds great promise in bridging the space between zero-gap graphene [1a] and large-gap TMDs (1-2 eV). [1f] Moreover, it has been theoretically predicted that the bandgaps of its monolayer (phosphorene) and nanoribbon are highly sensitive to the plane strain and edge structures. [9] Based on its intriguing properties, BP nanosheets have been used in field-effect transistors (FETs), [6a,d] and theoretically predicted for thin film solar-cell [10] and gas sensing [11] applications. Despite the recent progress in mechanically exfoliated BP nanosheets, it is still a challenge to prepare new BP nanostructures in high yield, especially through solutionbased approaches.Herein, for the first time, we report a facile solution-based method for the preparation of black phosphorus quantum dots (BPQDs) from the bulk BP crystal. The as-synthesized BPQDs with average size of 4.9 AE 1.6 nm and thickness of 1.9 AE 0.9 nm (that is,...

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confidence: 99%

Black Phosphorus Quantum Dots

et al. 2015

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“…Nanocrystals, in the form of quantum dots, can be created in both solid-state (semiconductor) and liquid (colloidal) media. Fairly recently, colloidal quantum dots have attracted the interest of the electronic device engineering community as components of organic and inorganic materials combinations known as hybrid electronic materials (HEMs) [1][2][3][4][5]. With respect to nextgeneration optoelectronics, HEMs have shown promise as potential candidates in device applications such as fluorescent sensors [6], solar cells [7][8][9], and photodetectors [10].…”

Section: Discussionmentioning

confidence: 99%

A simple FBG sensor for strain–temperature discrimination

Parne

Prasad

Gupta

et al. 2011

Micro & Optical Tech Letters

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intensities. We obtained the highest FL for Q-CdS adsorbed onto GaAs for each of the three relative sizes of quantum dots. We suspect that this latter observation may be due to radiative recombination between electrons confined to the quantum dots with holes captured at the shallow acceptor level of the GaAsquantum dot interface. With an eye toward future HEM device applications, this higher FL emission would suggest further study of functionalized Q-CdS adsorbed onto GaAs. CONCLUSIONSWe have examined the FL spectra of AOT (dioctyl sulfoccinate) capped cadmium sulfide quantum dots (Q-CdS) deposited upon gold (Au), insulator (mica), and semiconductor (GaAs) substrates for their potential use in hybrid optoelectronic devices. Relative dot sizes were synthesized to increase from 1 to 5 nm with a respective increase in heptane concentration from 40 to 80 lL. Excitation and emission spectra are presented for the 200-400 nm and 400-700 nm ranges, respectively. For the smallest (40 lL heptane) quantum dots, a clear red shift in FL emission peak wavelength is observed from the Au, to mica, to GaAs substrate-based samples. For the midrange (70 lL) and largest (80 lL) Q-CdS samples, the longest emission peak wavelengths are observed for the quantum dots physisorbed to Au substrates with a subsequent decrease and then increase in emission wavelengths for the mica and GaAs substrate-based samples, respectively. Of the three types of substrates used, Q-CdS deposited upon GaAs exhibited the highest FL emission intensity, which bodes well for the possible integration of HEMs into next-generation device technology.ABSTRACT: A simple sensor using half the length of a 3-cm fiber Bragg grating embedded on a cantilever is proposed for the simultaneous measurement and discrimination of strain and temperature. The response of the sensor is linear from 30 to 200 C, and its strain and temperature sensitivities are found to be 3.38 pm/lm 19.05 pm/ C, respectively.ABSTRACT: A new silicon-based differential stacked spiral inductor (DSSI) was implemented using a standard 0.18-lm complimentary metal-oxide semiconductor technology. Based on the measured two-port S-parameter using a standard de-embedding procedure, the selfresonance frequency, f sr , and quality factor, Q, of the new DSSI were compared with a conventional DSSI. The f sr of the new DSSI was nearly twice as high as that of the conventional DSSI, and the Q value of the new DSSI was also enhanced.

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“…Quantum dots (QDs), in the size of 1-10 nm with 200 to 10000 atoms, are inorganic fluorescent nanomaterials composed of II-VI and III-V elements, such as CdSe, CdTe, ZnSe, InP, and InAs [1][2][3]. Therefore, QDs are also called "nanocrystals" and "artificial atoms."…”

Section: Introductionmentioning

confidence: 99%

Inkjet-Printed CdTe Quantum Dots-Polyurethane Acrylate Thin Films

Liu

Jiang

2017

Journal of Nanomaterials

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We demonstrated the inkjet-printed CdTe quantum dots-polyurethane acrylate thin films and their potential application in the display devices. The water soluble CdTe QDs were synthesized through the wet chemistry and the emission wavelengths can be freely tuned during the preparation process. Combining with the UV curable resin polyurethane acrylate, the QDs inks were prepared and the influence of diluent and water content on the performance of resultant films was studied. The tensile stress of the films cured from the QDs inks with diluent increased from 10.6 MPa to 27.5 MPa and the low water content led to uniform polymer matrix. Furthermore, the existence of diluent and low water content would all improve the fluorescence stability of the thin films. Finally, the thin films can be deposited on different substrates and well controlled to meet the RGB color standard, which will pave the way to a simple, low-cost, large-scale, and highly reliable method for the application of flexible displays.

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Applications of colloidal quantum dots

Cited by 43 publications

References 27 publications

Black Phosphorus Quantum Dots

Black Phosphorus Quantum Dots

A simple FBG sensor for strain–temperature discrimination

Inkjet-Printed CdTe Quantum Dots-Polyurethane Acrylate Thin Films

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