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

An "on-off-on" fluorescent nanoprobe for recognition of chromium(VI) and ascorbic acid based on phosphorus/nitrogen dual-doped carbon quantum dot., Gong, Xiaojuan, Liu Yang, Yang Zhenhua, Shuang Shaomin, Zhang Zeyu, and Dong Chuan , Anal Chim Acta, 2017 May 22, Volume 968, p.85-96, (2017)

Nitrogen doped graphene quantum dots based long-persistent chemiluminescence system for ascorbic acid imaging., Chen, Hongjun, Wang Qin, Shen Qinpeng, Liu Xin, Li Wang, Nie Zhou, and Yao Shouzhuo , Biosens Bioelectron, 2017 May 15, Volume 91, p.878-884, (2017)

Nitrogen-doped graphene quantum dots-labeled epitope imprinted polymer with double templates via the metal chelation for specific recognition of cytochrome c., Yan, Yun-Jing, He Xi-Wen, Li Wen-You, and Zhang Yu-Kui , Biosens Bioelectron, 2017 May 15, Volume 91, p.253-261, (2017)

The off-stoichiometry effect on the optical properties of water-soluble copper indium zinc sulfide quantum dots., Xu, Yanqiao, Chen Ting, Hu Xiaobo, Jiang Wan, Wang Lianjun, Jiang Weihui, and Liu Jianmin , J Colloid Interface Sci, 2017 Jun 15, Volume 496, p.479-486, (2017)

Preparation and photovoltaic properties of CdS quantum dot-sensitized solar cell based on zinc tin mixed metal oxides., Cao, Jiupeng, Zhao Yifan, Zhu Yatong, Yang Xiaoyu, Shi Peng, Xiao Hongdi, Du Na, Hou Wanguo, Qi Genggeng, and Liu Jianqiang , J Colloid Interface Sci, 2017 Jul 15, Volume 498, p.223-228, (2017)

The Study of Metal Sulfide as Efficient Counter Electrodes on the Performances of CdS/CdSe/ZnS-co-sensitized Hierarchical TiO2 Sphere Quantum Dot Solar Cells., Buatong, Nattha, Tang I-Ming, and Pon-On Weeraphat , Nanoscale Res Lett, 2017 Dec, Volume 12, Issue 1, p.170, (2017)

Solvent-Free Mechanosynthesis of Composition-Tunable Cesium Lead Halide Perovskite Quantum Dots., Zhu, Zhi-Yuan, Yang Qi-Qi, Gao Lin-Feng, Zhang Lei, Shi An-Ye, Sun Chun-Lin, Wang Qiang, and Zhang Hao-Li , J Phys Chem Lett, 2017 Apr 06, Volume 8, Issue 7, p.1610-1614, (2017)