What are "Quantum Dots"?
By using an external light (e.g. Ultraviolet) on nano-crystals (e.g. made from semiconductor materials such as zinc sulphide, cadmium selenide, indium phosphide or lead sulphide), the nano-crystal will absorb the light. And then, as a result of the crystal being stimulated by the absorbed light, it will re-emit the light, usually of a certain colour, depending on the size of the quantum dot.
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