GS Alliance Co., Ltd. (Green Science Alliance Co.,

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GS Alliance Co., Ltd. (Green Science Alliance Co., Ltd., a chemical company that develops / manufactures and sells advanced materials in the environmental and energy fields, Fuji Color Corp. Group, headquarters: Kawanishi City, Hyogo Prefecture, President: Ryohei Mori Dr. Engineering) mixed the perovskite quantum dots manufactured and sold in-house with the polyethylene resin to make a master batch composite, and furthermore, made it into a quantum dot sheet with a film molding machine. This quantum dot sheet may be applicable to quantum dot display and so on.

Quantum dots have problems such as weakness to gas, water vapor, light, heat, etc. Current quantum dot sheets had to be sealed with barrier film etc. after applying liquid quantum dots by printing method etc. However, this method will simplify the production of quantum dot sheets. In addition, it was the world's first time to make such a quantum dot sheet by forming a composite material by kneading quantum dots in resin.

Quantum Dot is a state-of-the-art material with nanoscale ultrafine structure that has optical properties that follow the laws of quantum chemistry and quantum mechanics. The size of the quantum dot is usually a very small structure called a diameter of 0.5 - 9 nm, and it is said that the number of molecules per molecule is 10 - 1,000, and it is said to be an artificial atom. Since it is possible to adjust the band gap according to the size of nanocrystals, it has characteristic light emission characteristics depending on particle size. Therefore, the emission wavelength can be adjusted by changing the size of the particle size, and the half width of the spectrum is narrow compared to the solid phosphor. It has high quantum efficiency and can absorb a wide range of wavelengths.

The coloration of quantum dots is bright, vivid light can emit light with a wide range of wavelengths, and it has high efficiency, long life, and high attenuation coefficient, so it is expected to be applied in various applications as described below .

1. Solar cell
2. Display
3. Bio-imaging, biomarker, medical imaging device (cancer cell imaging, protein analysis, cell tracking etc.)
4. Quantum computer
5. Security tag, security ink, anti-counterfeiting
6. Quantum dot laser
7. Transistor
8. Photonic crystal
9. LED
10. High density solid memory
11. Thermoelectric material
12. Artificial photosynthesis

GS Alliance Co., Ltd. has already begun to sell and sell several types of quantum dots, and this time we have created a complex that mixes perovskite quantum dots with resin and emits light, and if we apply this technology it will also compound other quantum dots It is possible. Also, I made it for the purpose of quantum dot display, but this means that we could demonstrate the possibility of molding this quantum dot master batch complex into various kinds.
The quantum yield of the quantum dot sheet produced this time is 4 - 5%, the quantum yield of the quantum dot master batch complex of the same composition is 35 - 40% (the quantum yield of the organic solvent dispersion of the original perovskite quantum dot is 80 - 90%), so we need to investigate the cause of the decrease and consider improvement of the quantum yield.
From now on, we will also consider other quantum dot resin masterbatch composites and quantum dot resin composite molded products considering uses other than displays.


■ Company Profile Company
name: GS Alliance Co., Ltd. (Fuji Shikiso Co., Ltd. group)
Representative: Ryohei Mori (Doctor of Engineering) President / Representative Director
Location: Kohaka, Kawanishi, Hyogo Prefecture 666-0015
Business description: Environment, Energy Research and development and manufacture and sale of advanced materials for the field
URL: https://www.gsalliance.co.jp/

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