What is Quantum dots?

At all exhibitions in which IQDEMY holding participates, the maximum views of visitors are focused on products on which images with quantum dots are printed. Large manufacturers of electronics and other spheres are actively using these truly unusual particles. What is behind this name, associated with something very high-tech?

Such associations arise for a reason

A quantum dot (QD) is a semiconductor nanocrystal of extremely small dimensions, so small that its electrons behave like an electron of an atom. The size of it is 2 - 10 nm, depending on this, the CT can shine in different colors. It's amazing that quantum dots have been known to the world of scientists for a long time already, the Russian-American physicist Alexei Yekimov produced them in 1981 and noticed extraordinary properties, but it was possible to produce them on a large scale and find real application only in our time.


Why quantum dots are shining?

Glow (luminescence), as a physical process - a stream of photons (an elementary particle, a quantum of electromagnetic radiation). Depending on the wavelength (or the size of the energy) of the photon, our eye perceives it as a light of a certain color.

In simple terms, a quantum dot can be considered as a ball, in its center there is a core, which can consist of various elements (for example, zinc, cadmium, silver, indium), this core is enveloped by orbits that are at different distances from it. Electrons fly in these orbits.

As we know, the nucleus constantly attracts electrons and they themselves cannot move away from it. But by applying light to a quantum dot with a certain frequency, we can give the electron energy, so that it can move away from the nucleus to a distant orbit. Moving to a distant orbit, he leaves behind a "hole". However, it cannot be in a distant orbit for a long time, an especial bond (an exciton) arises between the electron and the hole. At some point, the electron returns to its place (recombination) and the energy of the exciton is emitted in the form of a photon.

Why QD are shining in different colors?

As we said earlier, the color of the QD depends on its size, just as the distance on which the orbits from the nucleus and their density are located depends on the size. The smaller the point, the more difficult it is for the electron to jump from orbit to orbit, it needs a different amount of energy, accordingly it emits photons with different wavelengths. By synthesizing points of different sizes, we can clearly adjust the color with which it will glow. The efficiency of the luminescence of a quantum dot is called the quantum yield, this is the ratio of the amount of the received and radiated energy of QD.



The IQDEMY laboratory today can offer to customers quantum dots with a quantum yield of up to 99.6%, which is very high, but these points are very expensive, therefore, points with an efficiency of up to 95% go to the mass market, depending on the color. The lower wavelength - the smaller quantum yield. It's physics, and it's impossible to change it. That is, red QDs have a maximum quantum yield, blue - minimum. Green, yellow and orange - medium.


Scopes of aplication of Quantum Dots

Production of ink for marking and encoding of securities, money, brand products.
Production of ink for marking and encoding of securities, money, brand products.
Production of non-destructive anatomical control systems, diagnosis of cancers, severe virus.
Production of non-destructive anatomical control systems, diagnosis of cancers, severe virus.
1. Production of crystals for LED displays of televisions, mobile phones, etc. 2. Production of transistors for computer systems. 3. Production of components for semiconductor lasers.
1. Production of crystals for LED displays of televisions, mobile phones, etc. 2. Production of transistors for computer systems. 3. Production of components for semiconductor lasers.
Production of light-converting coatings for yield and speed of fruit plants ripening in greenhouses increase.
Production of light-converting coatings for yield and speed of fruit plants ripening in greenhouses increase.
Production of printing compounds to increase solar batteries efficiency in consumer and aerospace industries.
Production of printing compounds to increase solar batteries efficiency in consumer and aerospace industries.
Production of oil additives (tracers) to find the optimal location for oil and gas field development.
Production of oil additives (tracers) to find the optimal location for oil and gas field development.
Production of sensors for radioactive ions, explosives and biological poisons identification.
Production of sensors for radioactive ions, explosives and biological poisons identification.
If you have an idea how to apply quantum dots, contact us!
If you have an idea how to apply quantum dots, contact us!

CONTACT INFORMATION

IQDEMY QUANTUM TECHNOLOGY SA

3960, Techno-Pole 4, Sierre, Switzerland

+41 79 198 20 82

quantum@iqdemy.pro

Monday-Friday, 9 a.m. – 6 p.m. (CET)