Low-threshold near-infrared lasing at room temperature using low-toxicity Ag2Se quantum dots

Nanoscale ◽  
2020 ◽  
Vol 12 (42) ◽  
pp. 21879-21884
Author(s):  
Chen Liao ◽  
Luping Tang ◽  
Liye Wang ◽  
Yan Li ◽  
Jie Xu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Near Infrared ◽  
Low Toxicity ◽  
Low Threshold

Benefiting from the low (2-fold) degeneracy of the lowest quantized states of orthorhombic Ag2Se quantum dots, room-temperature near-infrared lasing with a low threshold (163 μJ cm−2) is achieved.

Vapour Sensitivity of InP Surface Quantum Dots

2014 ◽  
Vol 605 ◽  
pp. 177-180 ◽  
Author(s):  
Roberta de Angelis ◽  
Mauro Casalboni ◽  
Liliana D’Amico ◽  
Fabio de Matteis ◽  
Fariba Hatami ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Near Infrared ◽  
Surface Recombination ◽  
Surface States ◽  
Infrared Emission ◽  
Polar Solvents ◽  
Solvent Type ◽  
Near Infrared Emission ◽  
Inp Surface

We studied the effect of solvent vapours on the photoluminescent emission of self-assembled InP surface quantum dots (SQDs). Their room temperature near infrared emission undergoes a fully reversible intensity enhancement when the dots were exposed to vapours of polar solvents since polar molecules are likely to be adsorbed onto intrinsic surface states and thus reducing non radiative surface recombination. The shape and position of the emission band does not change. The observed effect is dependent on solvent type and concentration with linear law over a limited concentration range.

Electroluminescence of Hybrid Self-Organised Fibres Incorporating CdTe Quantum Dots

2012 ◽  
Vol 65 (9) ◽  
pp. 1257 ◽  
Author(s):  
Masanori Ando ◽  
Chie Hosokawa ◽  
Ping Yang ◽  
Norio Murase
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Room Temperature ◽  
Low Voltage ◽  
The Self ◽  
Cdte Quantum Dots ◽  
Electroluminescent Devices ◽  
Interdigitated Array Electrodes ◽  
Low Threshold ◽  
Interdigitated Array

We demonstrated electroluminescence from hybrid 1D glass fibres incorporating CdTe quantum dots with a thin SiO2 overlayer which contains CdS-like clusters. The self-organised fibres, prepared by refluxing precursor nanowires, exhibited red electroluminescence on Au interdigitated array electrodes at room temperature. Although fluctuation with time was observed in the electroluminescence, relatively low threshold electric field (2.6 × 106 V m–1) suggests that the CdTe quantum dots-based hybrid fibres are expected to be applied to low voltage driven electroluminescent devices.

Low-threshold amplification of spontaneous emission from AgInS2 quantum dots

2020 ◽  
Vol 8 (25) ◽  
pp. 8515-8520
Author(s):  
Qian Xiong ◽  
Jinlong Yang ◽  
Huaiyi Ding ◽  
Juan Du ◽  
Xiaosheng Tang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Room Temperature ◽  
Low Threshold

Amplification of spontaneous emission from AgInS2 quantum dots with low threshold is demonstrated at room temperature.

scholarly journals Carbon Quantum Dots for Biomedical Applications: Review and Analysis

2021 ◽  
Vol 8 ◽  
Author(s):  
Nayab Azam ◽  
Murtaza Najabat Ali ◽  
Tooba Javaid Khan
Keyword(s):  
Quantum Dots ◽  
Biomedical Applications ◽  
Near Infrared ◽  
Pharmaceutical Formulations ◽  
Carbon Quantum Dots ◽  
Excitation Wavelength ◽  
Physiochemical Properties ◽  
Electrochemical Biosensing ◽  
New Type ◽  
Low Toxicity

Carbon quantum dots (CQDs) are a new type of nano-carbons that are currently favored over semiconductor quantum dots (QDs) because of their solubility, low toxicity, eco-friendliness, and cheap and facile synthesis giving desired optical characteristics. Moreover, their physiochemical properties can be controlled by their synthetic route. CQDs can emit fluorescence in the range from the UV to the near-infrared (NIR) region, making them suitable for biomedical applications. Fluorescence in these nano-carbon atoms can be tuned by varying the excitation wavelength. As of now, CQDs have been used in various applications such as in bioimaging, biosensing, electrochemical biosensing, drug delivery, gene delivery, photodynamic therapy in the treatment of cancers, pharmaceutical formulations, and treating inflammation. This article highlights the current progress and advancement of CQDs with focus on their synthetic routes, chemical and optical properties, and biomedical applications along with new perceptions in this interesting and promising field.

Room-temperature doping of ytterbium into efficient near-infrared emission CsPbBr1.5Cl1.5 perovskite quantum dots

2020 ◽  
Vol 56 (43) ◽  
pp. 5811-5814 ◽  
Author(s):  
Shuangyi Zhao ◽  
Yubo Zhang ◽  
Zhigang Zang
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Room Temperature ◽  
Near Infrared ◽  
Infrared Emission ◽  
Perovskite Quantum Dots ◽  
Near Infrared Emission

Doping of Yb can facilitate the enhancement of NIR quantum yield in CsPbBr1.5Cl1.5 perovskite quantum dots.

Ultra-fast synthesis of water soluble MoO3−x quantum dots with controlled oxygen vacancies and their near infrared fluorescence sensing to detect H2O2

2020 ◽  
Vol 5 (11) ◽  
pp. 1538-1543
Author(s):  
Shichuan Zhong ◽  
Changchang Xing ◽  
An Cao ◽  
Tao Zhang ◽  
Xuejiao Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Detection Limit ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Near Infrared ◽  
Fluorescence Probe ◽  
Water Soluble ◽  
Fluorescence Sensing ◽  
Nir Fluorescence ◽  
Fast Synthesis

We report a facile method for the synthesis of water soluble MoO3−x QDs with controlled oxygen vacancies at room temperature within 5 seconds, the QDs could be used as a NIR fluorescence probe to detect H2O2 with a low detection limit (3 nM).

scholarly journals The room temperature phosphine-free synthesis of near-infrared emitting HgSe quantum dots

2014 ◽  
Vol 2 (12) ◽  
pp. 2107-2111 ◽  
Author(s):  
H. Mirzai ◽  
M. N. Nordin ◽  
R. J. Curry ◽  
J.-S. Bouillard ◽  
A. V. Zayats ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Near Infrared ◽  
High Quality

In this report, we describe a synthesis of high quality infrared emitting HgSe quantum dots using a variety of room temperature routes, resulting in particles of various morphologies.

scholarly journals Diagnosis of Prostate Cancer and Prostatitis Using near Infra-Red Fluorescent AgInSe/ZnS Quantum Dots

2021 ◽  
Vol 22 (22) ◽  
pp. 12514
Author(s):  
Vuyelwa Ncapayi ◽  
Neethu Ninan ◽  
Thabang C. Lebepe ◽  
Sundararajan Parani ◽  
Aswathy Ravindran Girija ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Quantum Dots ◽  
Cancer Cells ◽  
Near Infrared ◽  
Particle Diameter ◽  
Spherical Shape ◽  
Water Soluble ◽  
Prostate Cancer Cells ◽  
Intracellular Targeting ◽  
Low Toxicity

The link between the microbiome and cancer has led researchers to search for a potential probe for intracellular targeting of bacteria and cancer. Herein, we developed near infrared-emitting ternary AgInSe/ZnS quantum dots (QDs) for dual bacterial and cancer imaging. Briefly, water-soluble AgInSe/ZnS QDs were synthesized in a commercial kitchen pressure cooker. The as-synthesized QDs exhibited a spherical shape with a particle diameter of 4.5 ± 0.5 nm, and they were brightly fluorescent with a photoluminescence maximum at 705 nm. The QDs showed low toxicity against mouse mammary carcinoma (FM3A-Luc), mouse colon carcinoma (C26), malignant fibrous histiocytoma-like (KM-Luc/GFP) and prostate cancer cells, a greater number of accumulations in Staphylococcus aureus, and good cellular uptake in prostate cancer cells. This work is an excellent step towards using ternary QDs for diagnostic and guided therapy for prostate cancer.

scholarly journals Low threshold and room-temperature lasing of electrically pumped red-emitting InP/(Al0.20Ga0.80)0.51In0.49P quantum dots

2010 ◽  
Vol 210 ◽  
pp. 012009
Author(s):  
Marcus Eichfelder ◽  
Wolfgang-Michael Schulz ◽  
Matthias Reischle ◽  
Michael Wiesner ◽  
Robert Roßbach ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Electrically Pumped ◽  
Low Threshold

scholarly journals Precursor concentration and temperature controlled formation of polyvinyl alcohol-capped CdSe-quantum dots

2010 ◽  
Vol 1 ◽  
pp. 119-127 ◽  
Author(s):  
Chetan P Shah ◽  
Madhabchandra Rath ◽  
Manmohan Kumar ◽  
Parma N Bajaj
Keyword(s):  
Quantum Dots ◽  
Polyvinyl Alcohol ◽  
Room Temperature ◽  
Near Infrared ◽  
Deep Trap ◽  
Optical Absorption Spectroscopy ◽  
Band Edge Emission ◽  
Cdse Quantum Dots ◽  
Trap States ◽  
Transmission Electron

Polyvinyl alcohol-capped CdSe quantum dots, with a size within their quantum confinement limit, were prepared in aqueous solution at room temperature, by a simple and environmentally friendly chemical method. The size of the CdSe quantum dots was found to be dependent on the concentrations of the precursors of cadmium and selenium ions, as well as on the aging time and the reaction temperature; all of which could be used conveniently for tuning the size of the particles, as well as their optical properties. The synthesized quantum dots were characterized by optical absorption spectroscopy, fluorescence spectroscopy, X-ray diffraction, atomic force microscopy and transmission electron microscopy. The samples were fluorescent at room temperature; the green fluorescence was assigned to band edge emission, and the near-infrared fluorescence peaks at about 665 and 865 nm were assigned to shallow and deep trap states emissions, respectively. The quantum dots were fairly stable up to several days.

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