Getting quantum dot energized

Quantum dots are useful because when you add energy to their electrons, the electrons act they’re in one big atom.- and (as any physicist could tell you) When you add electrons in any atom, what you get is light. This occurs hen an electron moves to a higher energy level and then falls back again to it’s normal energy level. The same is true for quantum dots – zap them they will glow. One way to add energy to quantum dots is to shine an ultraviolet light on them

It turns that the smaller the quantum dot, larger the gap between energy levels. Which means more energy is packed into photons – which means more energy is packed into the photon that’s emitted when an electron falls from a higher energy level to it’s normal energy level.A small quantum dot emits higher energy photons – with a shorter wavelength than a large Q-dot can.
Think of this light in terms of color: a quantum dot of a particular size- a relatively larger size, to be exact- emits red light, which is the longest wave length of visible light: smaller quantum dots produce different colors. If you keep going smaller and smaller, you’ll eventually get to a tiny quantum dots that produce blue light.- the shortest wavelength of visible light. If you come up with really large quantum dots you might get them to emit infrared light: incredibly teensy quantum dots might emit ultra violet light, outside the visible spectrum.

So where do you get quantum dots (No you cant find them in one stop shops store at least not yet) It turns out that it is possible to grow a large number of quantum dots in a chemical reactions. But the methods used range from simple wet –chemical setups. (In which you precipitate zinc sulphide crystals) to complicate methods such as chemical-vapor deposition.(Which is also used to grow carbon Nanotubes). You can control the size of the particular batch of quantum dots- ensuring that they all emit the same wavelength of light- by controlling the length of time you allow the reaction to run. But what do you do with them once you have got them?