Write any three applications of quantum dot.
Answers
The Properties of Quantum Dots
Quantum dots were discovered by the Russian Physicist Alexey I. Ekimov in 1981. The tiny nanoparticles have diameters which range from 2 nanometers to 10 nanometers. The particles differ in color depending on their size. Quantum dots can be classified into different types based on their composition and structure, which includes core type, core shell and alloyed quantum dots.Quantum dots emit light when excited, with smaller dots emitting higher energy light. Manufacturers can accurately control the size of a quantum dot and as a result they are able ‘tune’ the wavelength of the emitted light to a specific color.
They find applications in several areas such as solar cells, transistors, LEDs, medical imaging and quantum computing, thanks to their unique electronic properties.
Optical Applications
Quantum dots can emit any color of light from the same material by changing the dot size. They have bright, pure colors along that can emit a rainbow of colors coupled with their high efficiencies, longer lifetimes and high extinction coefficient. The high extinction coefficient of a quantum dot makes it perfect for optical uses. Quantum dots of very high quality can be ideal for applications in optical encoding and multiplexing due to their narrow emission spectra and wide excitation profiles. Examples of optical applications of quantum dots include light emitting diodes (LEDs), solid state lighting, displays and photovoltaics.
Light Emitting Diodes
Quantum dot light emitting diodes (QD-LED) and ‘QD-White LED’ are very useful when producing the displays for electronic devices because they emit light in highly specific Gaussian distributions. QD-LED displays can render colors very accurately and use much less power than traditional displays.
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