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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
Quantum dots are tiny man-made crystals. They are so small that you canât see them with a typical microscope. In fact, theyâre 10,000 times narrower than a human hair. Thatâs incredibly small but donât let their size fool you. Quantum dots are actually very powerful devices and itâs their size that gives them a unique ability: to convert light into nearly any color in the visible spectrum with very high efficiency. Each quantum dot is actually a tiny semiconductor -- which means it can convert incoming energy. The electronic characteristics of quantum dots are determined by their size and shape. This means we can control the color of light given off by a quantum dot just by changing its size.