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

Sodium hexametaphosphate modulated fluorescence responsive biosensor based on self-assembly / disassembly mode of reduced-graphene quantum dots / chitosan system for alkaline phosphatase., Shi, Fanping, Li Jiao, Sun Jingjing, Huang Hui, Su Xingguang, and Wang Zonghua , Talanta, 2020 Jan 15, Volume 207, p.120341, (2020)

Highly luminescent Zn-Cu-In-S/ZnS core/gradient shell quantum dots prepared from indium sulfide by cation exchange for cell labeling and polymer composites., Yang, Lanlan, Antanovich Artsiom, Prudnikau Anatol, Taniya Olga S., Grzhegorzhevskii Kirill V., Zelenovskiy Pavel, Terpinskaya Tatiana, Tang Jianguo, and Artemyev Mikhail , Nanotechnology, 2019 Sep 27, Volume 30, Issue 39, p.395603, (2019)

Carbon Quantum Dots-Europium(III) Energy Transfer Architecture Embedded in Electrospun Nanofibrous Membranes for Fingerprint Security and Document Counterspy., Li, Rong Sheng, Liu Jia Hui, Yang Tong, Gao Peng Fei, Wang Jian, Liu Hui, Zhen Shu Jun, Li Yuan Fang, and Huang Cheng Zhi , Anal Chem, 2019 Sep 03, Volume 91, Issue 17, p.11185-11191, (2019)

Research Advances on Cytotoxicity of Cadmium-Containing Quantum Dots., Liang, Xue, and Tang Meng , J Nanosci Nanotechnol, 2019 Sep 01, Volume 19, Issue 9, p.5375-5387, (2019)

Manganese oxide-carbon quantum dots nano-composites for fluorescence/magnetic resonance (T1) dual mode bioimaging, long term cell tracking, and ROS scavenging., Das, Bodhisatwa, Girigoswami Agnishwar, Pal Pallabi, and Dhara Santanu , Mater Sci Eng C Mater Biol Appl, 2019 Sep, Volume 102, p.427-436, (2019)

The cytotoxicities in prokaryote and eukaryote varied for CdSe and CdSe/ZnS quantum dots and differed from cadmium ions., Hu, Liang, Zhong Hui, and He Zhiguo , Ecotoxicol Environ Saf, 2019 Oct 15, Volume 181, p.336-344, (2019)

Negatively charged molybdate mediated nitrogen-doped graphene quantum dots as a fluorescence turn on probe for phosphate ion in aqueous media and living cells., Wang, Yuhong, Weng Weiyang, Xu Hu, Luo Yong, Guo Dan, Li Dan, and Li Dawei , Anal Chim Acta, 2019 Nov 08, Volume 1080, p.196-205, (2019)

Rapid and green synthesis of cadmium telluride quantum dots with low toxicity based on a plant-mediated approach after microwave and ultrasonic assisted extraction: Synthesis, characterization, biological potentials and comparison study., Alvand, Zinab Moradi, Rajabi Hamid Reza, Mirzaei Ali, Masoumiasl Asad, and Sadatfaraji Hamed , Mater Sci Eng C Mater Biol Appl, 2019 May, Volume 98, p.535-544, (2019)

Highly selective circular dichroism sensor based on d-penicillamine/cysteamine‑cadmium sulfide quantum dots for copper (II) ion detection., Ngamdee, Kessarin, Chaiendoo Kanokwan, Saiyasombat Chatree, Busayaporn Wutthikrai, Ittisanronnachai Somlak, Promarak Vinich, and Ngeontae Wittaya , Spectrochim Acta A Mol Biomol Spectrosc, 2019 Mar 15, Volume 211, p.313-321, (2019)

Influence of doping ion, capping agent and pH on the fluorescence properties of zinc sulfide quantum dots: Sensing of Cu and Hg ions and their biocompatibility with cancer and fungal cells., Desai, Mittal L., Deshmukh Balaji, Lenka Nibedita, Haran Varun, Jha Sanjay, Basu Hirakendu, Singhal Rakesh Kumar, Sharma P K., Kailasa Suresh Kumar, and Kim Ki-Hyun , Spectrochim Acta A Mol Biomol Spectrosc, 2019 Mar 05, Volume 210, p.212-221, (2019)

Three-Dimensional Cadmium Telluride Quantum Dots-DNA Nanoreticulation as a Highly Efficient Electrochemiluminescent Emitter for Ultrasensitive Detection of MicroRNA from Cancer Cells., Sun, Man-Fei, Liu Jia-Li, Chai Ya-Qin, Zhang Jin, Tang Ying, and Yuan Ruo , Anal Chem, 2019 Jun 18, Volume 91, Issue 12, p.7765-7773, (2019)

Band to Band Tunneling at the Zinc Oxide (ZnO) and Lead Selenide (PbSe) Quantum Dot Contact; Interfacial Charge Transfer at a ZnO/PbSe/ZnO Probe Device., Kim, Minkyong, Han Chang-Yeol, Yang Heesun, and Park Byoungnam , Materials (Basel), 2019 Jul 17, Volume 12, Issue 14, (2019)

Atom Probe Tomographic Imaging of PbS Quantum Dot Formation on Neodymium Clusters in Silicate Glasses., Park, Won Ji, Kim Ju Eun, Lee Ho Jeong, Park Chan Gyung, and Heo Jong , Sci Rep, 2019 Jul 11, Volume 9, Issue 1, p.10029, (2019)

One-step synthesis of boron-doped graphene quantum dots for fluorescent sensors and biosensor., Ge, Shuyan, He Jingbo, Ma Chenxing, Liu Jiyang, Xi Fengna, and Dong Xiaoping , Talanta, 2019 Jul 01, Volume 199, p.581-589, (2019)