81‐1:
            Invited Paper:
            Quantum Dot Phosphors Containing None of Hazardous Element; ZnTe‐Based Alloy Quantum Dots

AbstractAlthough the main international research thrust on self-assembled epitaxial semiconductor quantum dots is currently being directed towards random alloy quantum dots, the suggestion is made that atomically ordered quantum dots which are grown by either epitaxy or endotaxy may in addition to their larger quantum confinement potentials possess superior long term structural stability. Such atomically ordered quantum dots should, therefore, be superior to random alloy quantum dots as far as prospective device applications are concerned. The basis for this suggestion is simple thermodynamic considerations. These considerations seem to explain our transmission electron microscopical observations of epitaxially grown atomically ordered In(Sb,As), (In,Ga)Sb, (Cd,Zn)Se, (Cd,Mn,Zn)Se quantum dots and Pb(Se,Te) quantum dot predecessor islands. Atomic ordering in (In,Ga)P quantum dot structures, as recently observed by other authors, does not seem to contradict our thermodynamic considerations. Endotaxially grown atomically ordered (In,Si,As) and (Sn,Si) quantum dots in Si matrices are briefly discussed as an even more unconventional approach to nanostructures with applications in electronics, photonics, information storage, and sensing.

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NiAg-graphene quantum dot-graphene hybrid with high oxidase-like catalytic activity for sensitive colorimetric detection of malathion

New Journal of Chemistry ◽

10.1039/d1nj00621e ◽

2021 ◽

Author(s):

Xu Dan ◽

Ruiyi Li ◽

Qinsheng Wang ◽

Yongqiang Yang ◽

Haiyan Zhu ◽

...

Keyword(s):

Quantum Dots ◽

Graphene Oxide ◽

Catalytic Activity ◽

Quantum Dot ◽

Colorimetric Detection ◽

Graphene Quantum Dots ◽

Functionalized Graphene ◽

Graphene Quantum Dot ◽

Nickel Silver

The paper reports the synthesis of nickel-silver-graphene quantum dot-graphene hybrid. Histidine-functionalized graphene quantum dots (His-GQDs) were bonded to graphene oxide (GO) and then combined with Ni2+ and Ag+ to form...

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Effect of Growth Temperature on the Characteristics of CsPbI3-Quantum Dots Doped Perovskite Film

Molecules ◽

10.3390/molecules26154439 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4439

Author(s):

Shui-Yang Lien ◽

Yu-Hao Chen ◽

Wen-Ray Chen ◽

Chuan-Hsi Liu ◽

Chien-Jung Huang

Keyword(s):

Thin Films ◽

Thermal Stability ◽

Quantum Dots ◽

Quantum Dot ◽

Growth Temperature ◽

Electron Mobility ◽

Surface Defects ◽

Different Temperatures ◽

Pb Doping ◽

Pristine Film

In this study, adding CsPbI3 quantum dots to organic perovskite methylamine lead triiodide (CH3NH3PbI3) to form a doped perovskite film filmed by different temperatures was found to effectively reduce the formation of unsaturated metal Pb. Doping a small amount of CsPbI3 quantum dots could enhance thermal stability and improve surface defects. The electron mobility of the doped film was 2.5 times higher than the pristine film. This was a major breakthrough for inorganic quantum dot doped organic perovskite thin films.

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Carbon quantum dot-sensitized hollow TiO2 spheres for high-performance visible light photocatalysis

New Journal of Chemistry ◽

10.1039/d1nj00501d ◽

2021 ◽

Author(s):

Xianfeng Zhang ◽

Zongqun Li ◽

Shaowen Xu ◽

Yaowen Ruan

Keyword(s):

Quantum Dots ◽

Quantum Dot ◽

Visible Light ◽

Photocatalytic Degradation ◽

High Performance ◽

Carbon Quantum Dots ◽

Visible Light Photocatalysis ◽

Carbon Quantum Dot ◽

Visible Light Photocatalytic

TiO2/CQD composites were synthesized through carbon quantum dots covalently attached to the surface of hollow TiO2 spheres for visible light photocatalytic degradation of organics.

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Quaternary Alloy Quantum Dots as Fluorescence Probes for Total Acidity Detection of Paper-Based Relics

Nanomaterials ◽

10.3390/nano11071726 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1726

Author(s):

Zhuorui Wang ◽

Cong Cheng ◽

Yongjuan Cheng ◽

Lizhen Zheng ◽

Daodao Hu

Keyword(s):

Quantum Dots ◽

Extraction Method ◽

Quaternary Alloy ◽

New Method ◽

Fluorescence Probes ◽

Total Acidity ◽

Weak Acids ◽

Paper Sample ◽

Composition And Structure ◽

Alloy Quantum Dots

Traditionally, the acidity of paper-based relics was determined by an extraction method and using a pH meter. This method could not obtain the total acidity of the paper-based relics because it only detected the concentration of free protons in the aqueous soaking solution. To overcome this defect, a new method for determining the total acidity of paper-based relics has been established by using quaternary alloy quantum dots. The quantum dots, CdZnSeS, modified by p-Aminothiophenol (pATP) were prepared, and their composition and structure were characterized. The fluorescence behavior of prepared quantum dots with acidity was investigated. The following results were obtained. The fluorescence of CdZnSeS-pATP quantum dots could decrease with increases in acidity because pATP dissociated from the surfaces of the quantum dots due to protons or undissociated weak acids. Based on this feature, a method for determining the acidity of paper-based relics was constructed, and this method was used to evaluate the acidity of actual paper-based relics. Obviously, for a given paper sample, since both free protons and bound protons can be determined by this method, the acidity measured by this method is more reasonable than that by pH meter.

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White-Light Emission from Zinc Chalcogenide Alloy Quantum Dots with Gradient Compositions

Journal of Luminescence ◽

10.1016/j.jlumin.2020.117876 ◽

2020 ◽

pp. 117876

Author(s):

Takahisa Omata ◽

Hiroshi Asano ◽

Satoshi Tsukuda ◽

Masao Kita

Keyword(s):

Quantum Dots ◽

White Light ◽

Light Emission ◽

White Light Emission ◽

Zinc Chalcogenide ◽

Alloy Quantum Dots

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Flexible and efficient perovskite quantum dot solar cells via hybrid interfacial architecture

Nature Communications ◽

10.1038/s41467-020-20749-1 ◽

2021 ◽

Vol 12 (1) ◽

Cited By ~ 1

Author(s):

Long Hu ◽

Qian Zhao ◽

Shujuan Huang ◽

Jianghui Zheng ◽

Xinwei Guan ◽

...

Keyword(s):

Thin Film ◽

Quantum Dots ◽

Solar Cells ◽

Quantum Dot ◽

High Performance ◽

Mechanical Stability ◽

Mechanical Adhesion ◽

Perovskite Quantum Dots ◽

Efficient Charge ◽

Photovoltaic Technologies

AbstractAll-inorganic CsPbI3 perovskite quantum dots have received substantial research interest for photovoltaic applications because of higher efficiency compared to solar cells using other quantum dots materials and the various exciting properties that perovskites have to offer. These quantum dot devices also exhibit good mechanical stability amongst various thin-film photovoltaic technologies. We demonstrate higher mechanical endurance of quantum dot films compared to bulk thin film and highlight the importance of further research on high-performance and flexible optoelectronic devices using nanoscale grains as an advantage. Specifically, we develop a hybrid interfacial architecture consisting of CsPbI3 quantum dot/PCBM heterojunction, enabling an energy cascade for efficient charge transfer and mechanical adhesion. The champion CsPbI3 quantum dot solar cell has an efficiency of 15.1% (stabilized power output of 14.61%), which is among the highest report to date. Building on this strategy, we further demonstrate a highest efficiency of 12.3% in flexible quantum dot photovoltaics.

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