About Quantum Dots

Quantum dots (QDs) are novel semiconductor nanocrystals that emit light in varying wavelegths across the visible spectrum depending on their size, shape, and composition. These" tunable" optical properties are advantageous for solid state lighting, electronic devices, solar cells, laser diodes, medical imaging devices, and numerous other optoelectronic applications. Employing quantum dots as sources of light improves the performance and energy efficiency of high-resolution displays in devices such as smartphones and high-definition television screens.

Quantum dots can be manufactured in various forms. Core-type quantum dots are composed of a single material, typically a metallic chalcogenide such as cadmium telluride or lead sulfide. Core-shell quantum dots (CSQDs, or core-shell semiconducting nanocrystals, CSSNCs) consist of a core-type material encapsulated within a second semiconductor material with a higher band gap. These hybrid particles such as cadmium selenide-zinc sulfide exhibit an improved quantum yield over single material quantum dots. Alloyed quantum dots are also composed of multiple materials, but in a homogeneous mixture rather than distinct regions. The combination of two different semiconductors with different band gaps imparts new properties distinct properties to the particles that are distinct from the original materials.

American Elements manufactures core-type, core-shell, and alloyed quantum dots from both "traditional" materials like cadmium selenide and novel ones like graphene. Our tightly controlled production methods yield materials with uniform particle sizes, morphologies, and compositions, allowing us to tune the emission colors to match the specifications of our customers.

Our quantum dot products are available as dispersions in both aqueous or organic solvents and can be produced in doped, functionalized, or coated forms. American Elements maintains industrial scale production for all its nanoscale products and will execute non-disclosure or confidentiality agreements to protect customer know-how.

Recent Research & Development for Quantum Dots

Use of MPA-capped CdS quantum dots for sensitive detection and quantification of Co ions in aqueous solution., Mohamed, Naim Bel Haj, Ben Brahim Nassim, Mrad Randa, Haouari Mohamed, Ben Chaâbane Rafik, and Negrerie Michel , Anal Chim Acta, 2018 Oct 22, Volume 1028, p.50-58, (2018)

Short-term assessment of cadmium toxicity and uptake from different types of Cd-based Quantum Dots in the model plant Allium cepa L., Modlitbová, Pavlína, Pořízka Pavel, Novotný Karel, Drbohlavová Jana, Chamradová Ivana, Farka Zdeněk, Zlámalová-Gargošová Helena, Romih Tea, and Kaiser Jozef , Ecotoxicol Environ Saf, 2018 May 30, Volume 153, p.23-31, (2018)

Facile preparation of a TiO quantum dot/graphitic carbon nitride heterojunction with highly efficient photocatalytic activity., Wang, Xing, Jiang Subin, Huo Xuejian, Xia Rui, Muhire Elisée, and Gao Meizhen , Nanotechnology, 2018 May 18, Volume 29, Issue 20, p.205702, (2018)

Wet Chemically Synthesized Bismuth Oxyiodide (BiOI) Quantum Dots for Photocatalytic Degradation of Malachite Green., Yin, Bing, and Liu Chaohong , J Nanosci Nanotechnol, 2018 May 01, Volume 18, Issue 5, p.3571-3576, (2018)

A graphene quantum dots based electrochemiluminescence immunosensor for carcinoembryonic antigen detection using poly(5-formylindole)/reduced graphene oxide nanocomposite., Nie, Guangming, Wang Yang, Tang Yun, Zhao Dan, and Guo Qingfu , Biosens Bioelectron, 2018 Mar 15, Volume 101, p.123-128, (2018)

QPRTase modified N-doped carbon quantum dots: A fluorescent bioprobe for selective detection of neurotoxin quinolinic acid in human serum., Singh, Ranjana, Kashayap Sunayana, Singh Vimal, Kayastha Arvind M., Mishra Hirdyesh, Saxena Preeti Suman, Srivastava Anchal, and Singh Ranjan K. , Biosens Bioelectron, 2018 Mar 15, Volume 101, p.103-109, (2018)

Nanohybrid of Carbon Quantum Dots/Molybdenum Phosphide Nanoparticle for Efficient Electrochemical Hydrogen Evolution in Alkaline Medium., Zhang, Linjie, Yang Yanmei, Ziaee Muhammad Asad, Lu Kanglong, and Wang Ruihu , ACS Appl Mater Interfaces, 2018 Mar 09, (2018)

tracking of adipose tissue grafts with cadmium-telluride quantum dots., Deglmann, Claus J., Błażków-Schmalzbauer Katarzyna, Moorkamp Sarah, Wallmichrath Jens, Giunta Riccardo E., Rogach Andrey L., Wagner Ernst, Baumeister Ruediger G., and Ogris Manfred , Arch Plast Surg, 2018 Mar, Volume 45, Issue 2, p.111-117, (2018)

Direct determination of graphene quantum dots based on terbium-sensitized luminescence., Llorent-Martínez, Eulogio J., Molina-García Lucía, Durán Gema M., Ruiz-Medina Antonio, and Ríos Ángel , Spectrochim Acta A Mol Biomol Spectrosc, 2018 Jun 05, Volume 198, p.177-181, (2018)

Synthesis of Nitrogen- and Chlorine-Doped Graphene Quantum Dots for Cancer Cell Imaging., Nafiujjaman, Md, Joon Hwang, Kwak Kwang Soo, and Lee Yong-Kyu , J Nanosci Nanotechnol, 2018 Jun 01, Volume 18, Issue 6, p.3793-3799, (2018)

Using silicon-coated gold nanoparticles to enhance the fluorescence of CdTe quantum dot and improve the sensing ability of mercury (II)., Zhu, Jian, Chang Hui, Li Jian-Jun, Li Xin, and Zhao Jun-Wu , Spectrochim Acta A Mol Biomol Spectrosc, 2018 Jan 05, Volume 188, p.170-178, (2018)

In situ silica coating-directed synthesis of orthorhombic methylammonium lead bromide perovskite quantum dots with high stability., Yang, Mu, Peng Hong-Shang, Zeng Fan-Long, Teng Feng, Qu Zhen, Yang Di, Wang Yi-Quan, Chen Gen-Xiang, and Wang Da-Wei , J Colloid Interface Sci, 2018 Jan 01, Volume 509, p.32-38, (2018)

Graphene quantum dots-terbium ions as novel sensitive and selective time-resolved luminescent probes., Llorent-Martínez, Eulogio J., Durán Gema M., Ríos Ángel, and Ruiz-Medina Antonio , Anal Bioanal Chem, 2018 Jan, Volume 410, Issue 2, p.391-398, (2018)

A specific nanoprobe for cysteine based on nitrogen-rich fluorescent quantum dots combined with Cu2., Gu, Tingting, Zou Wu, Gong Fuchun, Xia Jiaoyun, Chen Can, and Chen Xuejiao , Biosens Bioelectron, 2018 Feb 15, Volume 100, p.79-84, (2018)