InPZnS alloy quantum dots with tris(hexylthio)phosphine as a dual anionic precursor

Nanoscale ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 3014-3019 ◽  
Author(s):  
Soyeon An ◽  
Hyelim Cho ◽  
Heung Bae Jeon ◽  
Sang-Wook Kim
Keyword(s):  
Quantum Dots ◽  
Quantum Efficiency ◽  
Emission Wavelength ◽  
Alloy Quantum Dots ◽  
Maximum Quantum Efficiency

New anionic precursor, tris(hexylthio)phosphine(THTP), is introduced for use with InP-based QDs, as a result, the emission wavelength from 530 nm to 570 nm and a maximum quantum efficiency of 42% are obtained.

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

Nanomaterials ◽  
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.

Measuring temperature heterogeneities during solar-photothermal heating using quantum dot nanothermometry

The Analyst ◽  
2021 ◽  
Author(s):  
Stephanie K. Loeb ◽  
Haoran Wei ◽  
Jae-Hong Kim
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Fluorescence Emission ◽  
Emission Wavelength ◽  
Wavelength Shift ◽  
Cdse Quantum Dots ◽  
Photothermal Heating

The fluorescence emission wavelength shift of CdSe quantum dots due to heat-induced lattice dilatation is used to spatially resolve temperatures in solar photothermal systems.

Dense arrays of site-controlled quantum dots with tailored emission wavelength: Growth mechanisms and optical properties

2017 ◽  
Vol 111 (22) ◽  
pp. 221102 ◽  
Author(s):  
Alessandro Surrente ◽  
Marco Felici ◽  
Pascal Gallo ◽  
Alok Rudra ◽  
Benjamin Dwir ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Emission Wavelength ◽  
Growth Mechanisms ◽  
Dense Arrays

Controlling emission wavelength from InAs self-assembled quantum dots on InP (001) during MOCVD

2005 ◽  
Vol 26 (1-4) ◽  
pp. 81-85 ◽  
Author(s):  
Y. Sakuma ◽  
K. Takemoto ◽  
S. Hirose ◽  
T. Usuki ◽  
N. Yokoyama
Keyword(s):  
Quantum Dots ◽  
Emission Wavelength ◽  
Self Assembled

Interdiffused InGaAsP Quantum Dots Lasers on GaAs by Metal Organic Chemical Vapor Deposition

2005 ◽  
Vol 891 ◽  
Author(s):  
Ronald A. Arif ◽  
Nam-Heon Kim ◽  
Luke J. Mawst ◽  
Nelson Tansu
Keyword(s):  
Quantum Dots ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Emission Wavelength ◽  
Organic Chemical ◽  
Phosphorus Species ◽  
Metal Organic ◽  
Self Assembled ◽  
Organic Chemical Vapor Deposition

ABSTRACTSelf-assembled InGaAs quantum dots (QD) grown by metal organic chemical vapor deposition (MOCVD) have a natural peak emission wavelength around 1150-1200-nm due to its specific composition, shapes, and sizes. In this work, a new method to engineer the emission wavelength capability of MOCVD-grown InGaAs QD on GaAs to ∼1000-nm by utilizing interdiffused InGaAsP QD has been demonstrated. Incorporation of phosphorus species from the GaAsP barriers into the MOCVD-grown self-assembled InGaAs QD is achieved by interdiffusion process. Reasonably low threshold characteristics of ∼ 200-280 A/cm2 have been obtained for interdiffused InGaAsP QD lasers emitting at 1040-nm, which corresponds to blue-shift of ∼ 85-90-nm in comparison to that of unannealed InGaAs QD laser.

Size-independent peak external quantum efficiency (>2%) of InGaN red micro-light-emitting diodes with an emission wavelength over 600 nm

2021 ◽  
Vol 119 (8) ◽  
pp. 081102
Author(s):  
Panpan Li ◽  
Hongjian Li ◽  
Haojun Zhang ◽  
Cheyenne Lynsky ◽  
Mike Iza ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Emission Wavelength ◽  
Light Emitting

Facile Synthesis and Characterization of CdSe/ZnSe Core/Shell and ZnxCd1−xSe Alloy Quantum Dots via Non-organometallic Route

2018 ◽  
Vol 30 (1) ◽  
pp. 161-169 ◽  
Author(s):  
Oluwatobi Samuel Oluwafemi ◽  
Vuyelwa Ncapayi ◽  
Sundararajan Parani ◽  
Ncediwe Tsolekile
Keyword(s):  
Quantum Dots ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Facile Synthesis ◽  
Alloy Quantum Dots
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