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)

Mercury Telluride Quantum Dot Based Phototransistor Enabling High Sensitivity Room Temperature Photodetection at 2000 Nanometers., Chen, Mengyu, Lu Haipeng, Abdelazim Nema M., Zhu Ye, Wang Zhen, Ren Wei, Kershaw Stephen V., Rogach Andrey L., and Zhao Ni , ACS Nano, 2017 May 19, (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)

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)

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)

Electrically-Pumped Wavelength-Tunable GaAs Quantum Dots Interfaced with Rubidium Atoms., Huang, Huiying, Trotta Rinaldo, Huo Yongheng, Lettner Thomas, Wildmann Johannes S., Martín-Sánchez Javier, Huber Daniel, Reindl Marcus, Zhang Jiaxiang, Zallo Eugenio, et al. , ACS Photonics, 2017 Mar 15, Volume 4, Issue 4, p.868-872, (2017)

Versatility of a localized surface plasmon resonance-based gold nanoparticle-alloyed quantum dot nanobiosensor for immunofluorescence detection of viruses., Takemura, Kenshin, Adegoke Oluwasesan, Takahashi Naoto, Kato Tatsuya, Li Tian-Cheng, Kitamoto Noritoshi, Tanaka Tomoyuki, Suzuki Tetsuro, and Park Enoch Y. , Biosens Bioelectron, 2017 Mar 15, Volume 89, Issue Pt 2, p.998-1005, (2017)

Magneto-controlled aptasensor for simultaneous electrochemical detection of dual mycotoxins in maize using metal sulfide quantum dots coated silica as labels., Wang, Chengquan, Qian Jing, An Keqi, Huang Xingyi, Zhao Lufang, Liu Qian, Hao Nan, and Wang Kun , Biosens Bioelectron, 2017 Mar 15, Volume 89, Issue Pt 2, p.802-809, (2017)