Ternary I−III−VI Quantum Dots Luminescent in the Red to Near-Infrared

Allen, Peter M.; Bawendi, Moungi G.

doi:10.1021/ja8036349

Cited by 460 publications

(453 citation statements)

References 22 publications

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“…In addition, the absorption energy gap and photoluminescence in these materials are tunable over a wide range of the spectrum, from the near-infrared through the visible to the ultraviolet. [15][16][17][18] These flexible optical properties, combined with non-toxicity, indicate the great potential of CuInS 2…”

Section: -14mentioning

confidence: 99%

Energy band structure ofCuInS2and optical spectra ofCuInS2nanocrystals

2015

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Using first principles calculations we describe the energy band structure of bulk CuInS 2 . The energy band parameters for the multiband effective mass approximation that describes the band edges of this semiconductor are obtained by fitting them to the first principles spectra. Within the multiband effective mass approximation we develop a theoretical description for the structure of band edge levels and optical properties of the CuInS 2 nanocrystals. For the nanocrystals of spherical shape, the optical transitions are weakly allowed between the electron and hole ground states due to the tetragonal symmetry of the crystal lattice, resulting in a large Stokes shift of photoluminescence up to 300 meV in the smallest nanocrystals. This theory of the band edge optical transitions in CuInS 2 NCs can be applied to spherical NCs made of other chalcopyrite compounds.

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Section: -14mentioning

confidence: 99%

Energy band structure ofCuInS2and optical spectra ofCuInS2nanocrystals

2015

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“…Different types of core/shell QDs (CdSe/ZnS, CdTe/ZnS, and CdTe/ ZnSe), core/shell/shell QDs (CdTe/CdS/ZnS and CdSe/ CdTe/ZnSe), and environmentally friendly QDs (CuInSe, Ag 2 S, and Si) have been synthesized for various purposes. [19][20][21][22][23][24][25][26][27][28] In our previous study, we reported that CdTe/ZnSe core/shell QDs can be applied for in vitro imaging of chicken tissue and embryo. 29 The biological applications of QDs can be hampered by their inherently low solubility in water.…”

Section: Introductionmentioning

confidence: 99%

Using CdTe/ZnSe core/shell quantum dots to detect DNA and damage to DNA

Moulick

Milosavljević

Vlachova

et al. 2017

IJN

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CdTe/ZnSe core/shell quantum dot (QD), one of the strongest and most highly luminescent nanoparticles, was directly synthesized in an aqueous medium to study its individual interactions with important nucleobases (adenine, guanine, cytosine, and thymine) in detail. The results obtained from the optical analyses indicated that the interactions of the QDs with different nucleobases were different, which reflected in different fluorescent emission maxima and intensities. The difference in the interaction was found due to the different chemical behavior and different sizes of the formed nanoconjugates. An electrochemical study also confirmed that the purines and pyrimidines show different interactions with the core/shell QDs. Based on these phenomena, a novel QD-based method is developed to detect the presence of the DNA, damage to DNA, and mutation. The QDs were successfully applied very easily to detect any change in the sequence (mutation) of DNA. The QDs also showed their ability to detect DNAs directly from the extracts of human cancer (PC3) and normal (PNT1A) cells (detection limit of 500 pM of DNA), which indicates the possibilities to use this easy assay technique to confirm the presence of living organisms in extreme environments.

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“…Allen and Bawendi first reported CuInSe 2 -based QDs exhibiting bright PL emission, 57) and emission was in the red to nearinfrared region. The QD compositions were indium-rich CuIn 5 Se 8 and CuIn 2.3 Se 4 , which significantly deviated from stoichiometric CuInSe 2 .…”

Section: Cuinse 2 Qdsmentioning

confidence: 99%

Colloidal semiconductor quantum dots; syntheses, properties and applications

Omata

2015

J. Ceram. Soc. Japan

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The solution synthesis of colloidal semiconductor quantum dots (QDs), such as CdSe QDs, has developed tremendously in the last two decades. Such QDs exhibit excellent optical properties, such as size dependent optical gaps and efficient carrier multiplication, because of the quantum confinement effect. Colloidal QDs have potential in various optical and optoelectronic devices, such as light emitting devices, solar cells and wavelength converters for displays. The use of toxic cadmium materials in light emitting devices and wavelength converters is currently unavoidable for achieving full color visible emission. Less toxic alternatives are required. Safe facile procedures for synthesizing narrow gap arsenide QDs are also required for QD-solar cells, which exploit low threshold energies of carrier multiplication. This article reviews recent advances in the synthesis and properties of colloidal QDs. Their applications are reviewed in terms of cadmium-free QD-phosphors, and safe and facile syntheses of arsenide QDs for solar cells. Our group's research on the synthesis of the ternary chalcopyrite I-III-VI 2 semiconductors, ZnO and InAs QDs, and fabrication of electroluminescent devices using ZnO QDs is discussed.

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Ternary I−III−VI Quantum Dots Luminescent in the Red to Near-Infrared

Cited by 460 publications

References 22 publications

Energy band structure ofCuInS2and optical spectra ofCuInS2nanocrystals

Energy band structure ofCuInS2and optical spectra ofCuInS2nanocrystals

Using CdTe/ZnSe core/shell quantum dots to detect DNA and damage to DNA

Colloidal semiconductor quantum dots; syntheses, properties and applications

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