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

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)

Investigation of anti-solvent induced optical properties change of cesium lead bromide iodide mixed perovskite (CsPbBr3-xIx) quantum dots., Yuan, Lin, Patterson Robert, Wen Xiaoming, Zhang Zhilong, Conibeer Gavin, and Huang Shujuan , J Colloid Interface Sci, 2017 Oct 15, Volume 504, p.586-592, (2017)

Real-time fluorescence assay of alkaline phosphatase in living cells using boron-doped graphene quantum dots as fluorophores., Chen, Li, Yang Guancao, Wu Ping, and Cai Chenxin , Biosens Bioelectron, 2017 Oct 15, Volume 96, p.294-299, (2017)

New Antimony Selenide/Nickel Oxide Photocathode Boosts the Efficiency of Graphene Quantum-Dot Co-Sensitized Solar Cells., Kolay, Ankita, Kokal Ramesh K., Kalluri Ankarao, Macwan Isaac, Patra Prabir K., Ghosal Partha, and Deepa Melepurath , ACS Appl Mater Interfaces, 2017 Oct 11, Volume 9, Issue 40, p.34915-34926, (2017)

Formation and stability of manganese-doped ZnS quantum dot monolayers determined by QCM-D and streaming potential measurements., Oćwieja, Magdalena, Matras-Postołek Katarzyna, Maciejewska-Prończuk Julia, Morga Maria, Adamczyk Zbigniew, Sovinska Svitlana, Żaba Adam, Gajewska Marta, Król Tomasz, Cupiał Klaudia, et al. , J Colloid Interface Sci, 2017 Oct 01, Volume 503, p.186-197, (2017)

Polyoxometalate-Based Bottom-Up Fabrication of Graphene Quantum Dot/Manganese Vanadate Composites as Lithium Ion Battery Anodes., Ji, Yuanchun, Hu Jun, Biskupek Johannes, Kaiser Ute, Song Yu-Fei, and Streb Carsten , Chemistry, 2017 Nov 21, Volume 23, Issue 65, p.16637-16643, (2017)

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-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)

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)

Electrostatically driven resonance energy transfer in "cationic" biocompatible indium phosphide quantum dots., Devatha, Gayathri, Roy Soumendu, Rao Anish, Mallick Abhik, Basu Sudipta, and Pillai Pramod P. , Chem Sci, 2017 May 01, Volume 8, Issue 5, p.3879-3884, (2017)

Ultraviolet/ultrasound-activated persulfate for degradation of drug by zinc selenide quantum dots: Catalysis and microbiology study., Fakhri, Ali, Naji Mahsa, and Tahami Shiva , J Photochem Photobiol B, 2017 May, Volume 170, p.304-308, (2017)

Ruthenium nitrosyl functionalized graphene quantum dots as an efficient nanoplatform for NIR-light-controlled and mitochondria-targeted delivery of nitric oxide combined with photothermal therapy., Guo, Min, Xiang Hui-Jing, Wang Yi, Zhang Qian-Ling, An Lu, Yang Shi-Ping, Ma Yinchu, Wang Yucai, and Liu Jin-Gang , Chem Commun (Camb), 2017 Mar 18, Volume 53, Issue 22, p.3253-3256, (2017)

Synthesis and characterization of graphene quantum dots/CoNiAl-layered double-hydroxide nanocomposite: Application as a glucose sensor., Samuei, Sara, Fakkar Jila, Rezvani Zolfaghar, Shomali Ashkan, and Habibi Biuck , Anal Biochem, 2017 Mar 15, Volume 521, p.31-39, (2017)

A novel sandwiched electrochemiluminescence immunosensor for the detection of carcinoembryonic antigen based on carbon quantum dots and signal amplification., Li, Nian-Lu, Jia Li-Ping, Ma Rong-Na, Jia Wen-Li, Lu Yi-Yang, Shi Sha-Shan, and Wang Huai-Sheng , Biosens Bioelectron, 2017 Mar 15, Volume 89, Issue Pt 1, p.453-460, (2017)