A closer look
Turns out, you can trap an electron so hard it just screams in neon colors. Quantum dots are semiconductor crystals so absurdly tiny that they forcefully restrict where their internal electrons can physically move—a phenomenon known as quantum confinement. When you hit them with UV light, the electrons get excited and jump to a higher energy state. Because of the intense spatial confinement, the exact amount of energy they release when falling back down is determined solely by the physical diameter of the dot. A larger crystal spits out a lazy red photon, while a smaller, tighter crystal violently ejects a high-energy blue photon, making them the ultimate tunable glowing dye.
