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

Single photon emission from top-down etched III-nitride quantum dots., Hou, Yaonan, Wang Yong, and Ai Qingkang , Nanotechnology, 2020 Mar 27, Volume 31, Issue 13, p.13LT01, (2020)

Plasmon-enhanced fluorescence in gold nanorod-quantum dot coupled systems., Trotsiuk, Liudmila, Muravitskaya Alina, Kulakovich Olga, Guzatov Dmitry, Ramanenka Andrey, Kelestemur Yusuf, Demir Hilmi V., and Gaponenko Sergey , Nanotechnology, 2020 Mar 06, Volume 31, Issue 10, p.105201, (2020)

A General Route to Prepare Low-Ruthenium-Content Bimetallic Electrocatalysts for pH-Universal Hydrogen Evolution Reaction by Using Carbon Quantum Dots., Liu, Yuan, Li Xue, Zhang Qinghua, Li Weidong, Xie Yu, Liu Hanyu, Shang Lu, Liu Zhongyi, Chen Zhimin, Gu Lin, et al. , Angew Chem Int Ed Engl, 2020 Jan 20, Volume 59, Issue 4, p.1718-1726, (2020)

Removal and recovery of chloride ions in concentrated leachate by Bi(III) containing oxides quantum dots/two-dimensional flakes., Huang, Shouqiang, Li Liang, Zhu Nanwen, Lou Ziyang, Liu Weiqiao, Cheng Jiehong, Wang Haoming, Luo Pengxuan, and Wang Hui , J Hazard Mater, 2020 Jan 15, Volume 382, p.121041, (2020)

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)

Spatial energy transfer with observation of bimolecular singlet oxygen emission using quantum dots as donors and zinc-phthalocyanine as acceptors., Monte, Adamo F. G., Azevedo Guilherme, and Reis Arnaldo F. , Luminescence, 2020 Jan 08, (2020)

Lysine-Functionalized Tungsten Disulfide Quantum Dots as Artificial Enzyme Mimics for Oxidative Stress Biomarker Sensing., Garg, Mayank, Vishwakarma Neelam, Sharma Amit L., Mizaikoff Boris, and Singh Suman , ACS Omega, 2020 Feb 04, Volume 5, Issue 4, p.1927-1937, (2020)

A novel nanobiosorbent of functionalized graphene quantum dots from rice husk with barium hydroxide for microwave enhanced removal of lead (II) and lanthanum (III)., Mahmoud, Mohamed E., Fekry Nesma A., and Abdelfattah Amir M. , Bioresour Technol, 2020 Feb, Volume 298, p.122514, (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)