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Quantum dot - Wikipedia

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Quantum dots (QDs) or semiconductor nanocrystals are semiconductor particles a few nanometres in size with optical and electronic properties that differ from those of larger particles via quantum mechanical effects. They are a central topic in nanotechnology and materials science. When a quantum dot is illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conduction band. The excited electron can drop back into the valence band releasing its energy as light. This light emission (photoluminescence) is illustrated in the figure on the right. The color of that light depends on the energy difference between the discrete energy levels of the quantum dot in the conduction band and the valence band. In other words, a quantum dot can be defined as a structure on a semiconductor which is capable of confining electrons i

Quantum dot - Wikipedia Jump to content From Wikipedia, the free encyclopedia Nano-scale semiconductor particles Colloidal quantum dots irradiated with a UV light. Differently sized quantum dots emit different colors of light due to quantum confinement . Part of a series of articles on Nanomaterials Carbon nanotubes Synthesis Chemistry Mechanical properties Optical properties Applications Timeline Fullerenes Buckminsterfullerene C70 fullerene Chemistry Health impact Carbon allotropes Other nanoparticles Carbon quantum dots Carbon nanotube quantum dots Silicon quantum dots Cadmium-free quantum

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