Photoluminescence quenching and electron transfer in CuInS2/ZnS core/shell quantum dot and FePt nanoparticle blend films

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 30981-30988 ◽  
Author(s):  
Jie Hua ◽  
Haibo Cheng ◽  
Xi Yuan ◽  
Yan Zhang ◽  
Mei Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Steady State ◽  
Magnetic Nanoparticles ◽  
Quantum Dot ◽  
Core Shell ◽  
Photoluminescence Quenching ◽  
Time Resolved ◽  
Blend Films ◽  
Pl Quenching

The photoluminescence (PL) quenching of CuInS2/ZnS quantum dots (QDs) in blend films with FePt magnetic nanoparticles (MNs) was studied by steady-state and time-resolved PL spectroscopy.

Photoluminescence properties of transition metal-doped Zn–In–S/ZnS core/shell quantum dots in solid films

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44859-44864 ◽  
Author(s):  
Jiaming Li ◽  
Yang Liu ◽  
Jie Hua ◽  
Lianhua Tian ◽  
Jialong Zhao
Keyword(s):  
Quantum Dots ◽  
Steady State ◽  
Transition Metal ◽  
Metal Ion ◽  
Core Shell ◽  
Photoluminescence Properties ◽  
Time Resolved ◽  
Pl Spectra ◽  
Solid Films ◽  
Metal Doped

The photoluminescence (PL) properties of transition metal ion (Mn2+ or Cu+) doped Zn–In–S/ZnS core/shell quantum dots (QDs) in solution and solid films were investigated by using steady-state and time-resolved PL spectra.

scholarly journals Investigation on photoluminescence quenching of CdSe/ZnS quantum dots by organic charge transporting materials

2015 ◽  
Vol 33 (4) ◽  
pp. 709-713 ◽  
Author(s):  
Qu Yuqiu ◽  
Zhang Liuyang ◽  
An Limin ◽  
Wei Hong
Keyword(s):  
Quantum Dots ◽  
Oxidation Potential ◽  
Core Shell ◽  
Photoluminescence Intensity ◽  
Dynamic Quenching ◽  
Photoluminescence Quenching ◽  
Time Resolved ◽  
Quenching Efficiency ◽  
Hole Transporting ◽  
Time Resolved Photoluminescence

AbstractThe effect of different organic charge transporting materials on the photoluminescence of CdSe/ZnS core/shell quantum dots has been studied by means of steady-state and time-resolved photoluminescence spectroscopy. With an increase in concentration of the organic charge transporting material in the quantum dots solutions, the photoluminescence intensity of CdSe/ZnS quantum dots was quenched greatly and the fluorescence lifetime was shortened gradually. The quenching efficiency of CdSe/ZnS core/shell quantum dots decreased with increasing the oxidation potential of organic charge transporting materials. Based on the analysis, two pathways in the photoluminescence quenching process have been defined: static quenching and dynamic quenching. The dynamic quenching is correlated with hole transporting from quantum dots to the charge transporting materials.

Silicon quantum dot sensors for an explosive taggant, 2,3-dimethyl-2,3-dinitrobutane (DMNB)

2016 ◽  
Vol 52 (53) ◽  
pp. 8207-8210 ◽  
Author(s):  
Jin Soo Kim ◽  
Bomin Cho ◽  
Soo Gyeong Cho ◽  
Honglae Sohn
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Quantum Dot ◽  
Cadmium Selenide ◽  
Conduction Band ◽  
Band Edge ◽  
Conduction Band Edge ◽  
Cdse Qds ◽  
Silicon Quantum Dot ◽  
Pl Quenching

Conduction band edge dependent photoluminescence (PL) quenching by electron transfer was observed. PL from silicon quantum dots (Si QDs) was quenched by 2,3-dimethyl-2,3-dinitrobutane (DMNB), however PL from cadmium selenide (CdSe QDs) was not quenched by DMNB.

Degradation Studies of Colloidal Quantum Dot Light-Emitting Diodes

2011 ◽  
Vol 1286 ◽  
Author(s):  
Jie Liu ◽  
Chuang Xie ◽  
Yu Zhang ◽  
Wenjia Hu ◽  
Shawn Pickering ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Steady State ◽  
Quantum Dot ◽  
Thermal Instability ◽  
Light Emitting Diodes ◽  
Degradation Mechanism ◽  
Time Resolved ◽  
Light Emitting ◽  
Colloidal Quantum Dot ◽  
Time Resolved Photoluminescence

ABSTRACTThe degradation mechanism of CdSe/ZnS quantum dots (QDs) light-emitting diodes (LEDs) was investigated with steady-state and time-resolved photoluminescence measurements. Our study reveals that the degradation is associated with the decreasing quantum efficiency of the CdSe/ZnS QDs in the devices. Two mechanisms that cause the efficiency reduction were verified in the experiments: i.e., thermal instability and luminescence quenching.

Study on Photoluminescence Quenching of CdSe Core/Shell Quantum Dots with Organic Charge Transferring Material

2014 ◽  
Vol 981 ◽  
pp. 883-886
Author(s):  
Yu Qiu Qu ◽  
Liu Yang Zhang ◽  
Li Min An ◽  
Hong Wei ◽  
Gui Fan Li
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Fluorescence Lifetime ◽  
Spectral Methods ◽  
Shell Structure ◽  
Core Shell ◽  
Cdse Core ◽  
Photoluminescence Quenching ◽  
Molecular Concentration ◽  
Pl Quenching

The effect of organic charge transferring material (CTM) on fluorescence of CdSe/ZnS and CdSe/CdS/ZnS core/shell quantum dots (QDs) are investigated by spectral methods. With the increase of organic molecular concentration, CTM can greatly quench the fluorescence of QDs and shorten the fluorescence lifetime of QDs. In the process of interacting with CTM, the efficiency of fluorescence quenching for CdSe/ZnS is significantly higher than that for CdSe/CdS/ZnS. The results of experiment show that the shell structure of QDs plays the major role in photoluminescence (PL) quenching. The mechanism of PL quenching of QDs is also analyzed.

scholarly journals Magneto-Optical Characteristics of Streptavidin-Coated Fe3O4@Au Core-Shell Nanoparticles for Potential Applications on Biomedical Assays

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Chin-Wei Lin ◽  
Jian-Ming Chen ◽  
You-Jun Lin ◽  
Ling-Wei Chao ◽  
Sin-Yi Wei ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Faraday Effect ◽  
Au Nanoparticles ◽  
Optical Characteristics ◽  
Enzyme Linked Immunosorbent Assay ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Time Resolved ◽  
Biotechnology Research ◽  
Core Shell Nanoparticles

Abstract Recently, gold-coated magnetic nanoparticles have drawn the interest of researchers due to their unique magneto-plasmonic characteristics. Previous research has found that the magneto-optical Faraday effect of gold-coated magnetic nanoparticles can be effectively enhanced because of the surface plasmon resonance of the gold shell. Furthermore, gold-coated magnetic nanoparticles are ideal for biomedical applications because of their high stability and biocompatibility. In this work, we synthesized Fe3O4@Au core-shell nanoparticles and coated streptavidin (STA) on the surface. Streptavidin is a protein which can selectively bind to biotin with a strong affinity. STA is widely used in biotechnology research including enzyme-linked immunosorbent assay (ELISA), time-resolved immunofluorescence (TRFIA), biosensors, and targeted pharmaceuticals. The Faraday magneto-optical characteristics of the biofunctionalized Fe3O4@Au nanoparticles were measured and studied. We showed that the streptavidin-coated Fe3O4@Au nanoparticles still possessed the enhanced magneto-optical Faraday effect. As a result, the possibility of using biofunctionalized Fe3O4@Au nanoparticles for magneto-optical biomedical assays should be explored.

Balancing Electron Transfer and Surface Passivation in Gradient CdSe/ZnS Core–Shell Quantum Dots Attached to ZnO

2013 ◽  
Vol 4 (11) ◽  
pp. 1760-1765 ◽  
Author(s):  
Mohamed Abdellah ◽  
Karel Žídek ◽  
Kaibo Zheng ◽  
Pavel Chábera ◽  
Maria E. Messing ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Surface Passivation ◽  
Core Shell

One-pot synthesis of CdSe@CdS core@shell quantum dots and their photovoltaics application in quantum-dot-sensitized ZnO nanorods

2017 ◽  
Vol 332 ◽  
pp. 251-257 ◽  
Author(s):  
Chunyan Zhou ◽  
Qian Chen ◽  
Guofang Wang ◽  
Anxiang Guan ◽  
Jiehua Xu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Zno Nanorods ◽  
Core Shell ◽  
One Pot ◽  
One Pot Synthesis
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