Quantum Dot Now?
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.
In the same way as bulk semiconductor materials, electrons in quantum dots tend to move from end to end of band gaps. In quantum dots, however, the size of the band gap can be controlled simply by changing the quantum particle size. As the emission wavelength of a dot depends on the band gap, the emission wavelength of the dot can be tuned very precisely. In general, quantum dots are dispersible in solutions (water and a variety of organic solvents), enabling the use of low-cost printing and coating technologies.
In addition to displaying bright and vivid colors, quantum dots are able to emit light in a broad spectrum of wavelengths while exhibiting high efficiency, long life, and a high attenuation coefficient. As a result, active research and development is underway to utilize quantum dots in a wide range of applications, including biological imaging, lighting, displays, solar cells, security tags, quantum dot lasers, photonic materials, transistors, thermoelectric materials, and quantum computers.
What's QUANTUM BLUE?
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.。
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Quantum Dot Solar Cells
Quantum Dot Displays
Quantum Dot Solid-State Lighting
Quantum Dot Micro-LEDs
Quantum Dot Lasers
Quantum Dot Photonic Crystals
Quantum Dot Transistors
Quantum Dot Thermoelectric Conversion
Quantum Dots and Photocatalysts
Quantum Dots and Artificial Photosynthesis
Quantum Dot Agricultural Films
Quantum Dot Security Ink and Anti-Counterfeit Ink
Quantum Dot Automotive Headlights
Quantum Dot Endoscope Illuminants
Fluorescent Wheels for
Quantum Dot Projectors