Quantum dots are nanoscale particles possessing unique optical properties that obey the law of quantum chemistry and quantum mechanics. Normally, they have a diameter of 2 to 10 nm and consist of around 10 to 50 atoms and molecules. Because the size of the colloidal nanoscale particles can be used to adjust the band gap, the crystals have characteristic emission properties that depend on particle size. Quantum dots feature a tunable emission wavelength and narrow spectral half width, as well as high quantum efficiency. 

At the same time, they are able to absorb a wide range of wavelengths. The concepts of energy level, band gap, conduction band, and valence band correspond to the same concepts in ordinary bulk-sized semiconductors, with one major difference. In the bulk state, the particle size of semiconductor crystals is significantly larger than the exciton Bohr radius, and the excitons reach their natural limit. However, as semiconductor crystals become small, they approach the exciton Bohr radius of matter. The electron energy levels cease to be continuous and become divergent, meaning that a small separation between energy levels is generated. This state of separated energy levels is called quantum confinement. The semiconductor material ceases to be a bulk material, and enters a state known as a quantum dot, with major effects on absorption and light emission in the semiconductor material. 

While general quantum dots are semiconductors containing cadmium, the use of such heavy metals is regulated in many applications. Accordingly, work is underway to develop cadmium-free quantum dots that retain the luminance and stability of conventional quantum dots. Our company is making active efforts toward the development of both cadmium-free quantum dots and cadmium-containing quantum dots as we enhance our lineup through the synthesis of varied quantum dots. The commercialization of quantum dot technology is accompanied by issues in mass production; actual application is currently progressing only in markets where commercialization is viable with small amounts of materials, such as bio-imaging. However, we are proceeding with a method that synthesizes relatively large amounts at low cost, and aim to offer the technology at prices that place a low burden on the customer in mass production and large-volume orders.。