Due to their unique optical and electronic properties, colloidal quantum dots have attracted a large number of scholars to conduct in-depth research on them. Alfa Chemistry is dedicated to the development and synthesis of uniformly sized quantum dots with controllable size and shape. We have carried out a large number of exploratory experiments in the laboratory, and can achieve precise control of the three-dimensional structure of colloidal quantum dots using techniques such as photolithography and inkjet printing.
Our Quantum Dot Printing Platform
Alfa Chemistry's colloidal quantum dot printing technologies include, but are not limited to:
The lithography techniques we use for colloidal quantum dots are largely the same as conventional lithography techniques for making semiconductor chips. The only difference is that the quantum dots need to be mixed with the photoresist solution before casting onto the substrate, because both quantum dots and photoresist are well dispersed in organic solvents.
Fig.1 Photolithography of QDs. Schematic illustrations of photolithography of QDs (a) using photoresist-QDs mixtures and (b) using a lift-off process.
- Inkjet printing
Inkjet printing technology is the process of patterning by ejecting droplets onto a target substrate. Since colloidal quantum dots are easily dispersed in the solution phase, it is feasible to use quantum dot solutions as inks for inkjet printing. Alfa Chemistry is able to precisely control the composition of the quantum dot solvent system, while optimizing various parameters that affect speed (such as ink composition, nozzle size and bias voltage), and finally complete the printing process.
Fig.2 Inkjet printing of QDs. Schematic illustration of inkjet printing of QDs.
- Nanoimprinting & transfer printing
Nanoimprint lithography creates patterns by mechanical deformation of the desired ink or film under heat or UV exposure. We coat colloidal quantum dots on substrates, press them with rigid/soft patterned molds with high pressure and/or high temperature, and finally obtain uniform quantum dot patterns. In our transfer printing technology, quantum dots are first soaked or cast onto a pre-patterned stamp and then transferred to a donor substrate.
Fig.3 Schematic illustration of solvent-free transfer printing.
Alfa Chemistry's colloidal quantum dot printing platform is able to provide customers with custom patterning services for multiple types of quantum dots on various substrates. Our advanced printing technology is the most direct reason for you to choose us!
- Yang J, et al. Polymer-Assisted High-Resolution Printing Techniques for Colloidal Quantum Dots. Macromolecular Research. 2021, 29(6):391-401.
- Kim T H, et al. Full-colour quantum dot displays fabricated by transfer printing. Nature Photonics. 2011, 5(3):176-182.
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