Quantum dots go on display

Bourzac, Katherine

doi:10.1038/493283a

Cited by 199 publications

(151 citation statements)

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“…Their toxicity has always been of concern and could limit the diversity of their applications, such as in solar cells, light-emitting diodes, flat-screen televisions, and biomarkers. 81 The bio-toxicity depends on multiple factors, 82 which can be mainly classified into two groups: (1) the inherent 50 properties of QDs, including QD size, charge, composition, concentration, and outer-layer coating bioactivity (capping material, functional groups); (2) environmental factors such as oxidation, photolysis, and mechanical effects. A number of studies show that appropriate surface modification, modulating 55 the surface charge, and controlling the QD dosage can effectively reduce QD cytotoxicity.…”

Section: Qd Toxicitymentioning

confidence: 99%

Ultra-small fluorescent inorganic nanoparticles for bioimaging

et al. 2014

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Section: Qd Toxicitymentioning

confidence: 99%

Ultra-small fluorescent inorganic nanoparticles for bioimaging

et al. 2014

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“…1,2 Among these properties, we can cite high molar absorptivity, 3,4 high uorescence quantum yield, 5,6 exceptional multiphoton absorption, [7][8][9][10][11] and strong electron-phonon coupling. 12,13 Because of these remarkable features, QDs are of great technological interest since they have been used in several applications, such as solar and photovoltaic cells, 14,15 luminescent biolabels, 16 inkjet printing light-emitting devices, 17 displays, 18 and RGB devices. 19,20 The production of high quality QDs with controllable physical and chemical properties is not trivial, and much effort has been devoted to develop useful synthetic approaches for producing high quality 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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“…Colloidal QDs exhibit narrow FWHM and high PLQY, which can significantly enhance the color gamut of LCD monitors from 70% to 110% NTSC by replacing or partially replacing the traditional rare earth phosphors in the LED based backlighting units (BLUs). [123] Generally, there are mainly three structures to incorporate QDs into BLUs: on-chip structure where QDs are encapsulated on the blue LED chip to replace the rare earth phosphors for white LED, on-edge structure where QDs are loaded in an vacuum glass tube and placed upon the blue LED light strips to achieve white light source and on-surface structure by adding a quantum dots enhancement film (QDEF) which is placed between the light guide plate and brightness enhancement film and converts blue light into WCG white light. Among them, on-chip structure provides a direct means to examine the feasibility of QDs for display application, although the materials always suffer from thermal degradation.…”

Section: On-chip Incorporationmentioning

confidence: 99%

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Chang

Bai

Zhong

2018

Advanced Optical Materials

190

127

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in bulk halide perovskites, long carrier diffusion length, and an absorption range covering the visible solar spectrum, collectively enable the high performance of photo electricity conversion. Compared to the bulk materials, perovskite nanocrystals or quantum dots (usually denoted as PNCs or PQDs) show obvious excitonic features with enhanced photoluminescence (PL) properties due to the well-known size-dependent quantum confinement effects. [14][15][16][17] The combination of color saturated emissions, super high quantum yield (QY), as well as easy processing inspired the intensive exploration of PNCs as light emitters, which is now under spotlights in the field of optical materials.The first perspective aim of PNCs is to alternate the state-of-the-art CdSe or InP quantum dots (QDs) as new generation luminescence materials. [18,19] As shown in Figure 1, these QD materials have been well demonstrated to be potential functional components for photonic and optoelectronic applications, and are currently on the way to industrialization. [20][21][22][23] Specifically, QDs can be employed as fluorescence labels, [24] laser gain media, [25] LED phosphors, [26] and down-shifting films for LCD backlights. [27,28] They can also be processed into thin film for optoelectronic devices including solar cells, [29] photodetectors, [30,31] transistors [32] and LEDs. [33] The PNCs outcompete these conventional QDs in terms of narrower full width at half maximum (FWHM) and low fabrication cost, but most importantly, the ease of in situ preparation. [34,35] Herein, this progress report highlight the developments of in situ fabricated PNCs.Colloidal semiconductor QDs are typically synthesized ex situ in flasks by hot injection method, stabilized by surface ligands. [36][37][38][39] To incorporate such solution based materials into applications usually requires purification, redispersion and surface engineering. For instance, ligand exchange is often employed to disperse QDs into aimed solvent, inducing defects that inevitably derogating the PLQYs. [40] Moreover, the organic ligands themselves also suffer from the risk of disabsorbing, reducing the stability of the QDs and thus the final devices. [41] Because halide perovskite are ionic compounds that can be well dissolved into polar solvents, PNCs can be fabricated through either ex situ routes in flask or in situ strategies on substrates. The in situ fabricated PNCs are adaptable to devices integration due to their scalable and low-cost manufacturing. In this regard, more and more efforts have been made in terms of the controlling synthesis, physical properties and device applications of PNC materials.After over 30 years of development, colloidal quantum dots have now become mature luminescent materials in photonic and optoelectronic operations and start to hit the market. The emerging perovskite nanocrystals are expected to promote large-scale commercialization due to their superior optical properties as well as low cost and easy fabrication. This progress report is focused on the...

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Quantum dots go on display

Cited by 199 publications

References 0 publications

Ultra-small fluorescent inorganic nanoparticles for bioimaging

Ultra-small fluorescent inorganic nanoparticles for bioimaging

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

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

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