What are quantum dots and why are they important? Quantum dots are nanometer-sized, inorganic crystals that create light when stimulated with photons or electrons.
LED, or light emitting diodes, are recognized for their properties of providing low power, color rich, long lived lighting sources, however they might already be out of date, as recently a new type of LED has been designed, by using the quantum-dot technology. It seems that the new quantum-dot LED, or QDLED, is far better than its cousin, thus providing increased clarity and richer colors, and cheaper means to construct them.
A quantum dot represents a nanoscale semiconductor structure, which is used to confine electrons in three dimensions, thus it can be constructed from a cadmium selenide core which incorporates a zinc sulphide shell, in which electrons are excited to high energies, as they travel towards the ‘holes’ between the core and the shell, exciting the quantum dot that converts the energy received from the electron into light.
Quantum dot technology and the Quantum Light product platform, developed by the MIT-incubated nanotechnology company QD Vision Inc., is already being designed into new products by consumer electronics, flat panel display, electronic signage and solid-state lighting manufacturers. It promises to out perform liquid crystal displays (LCDs), plasma displays, LEDs and organic LEDs (OLEDs), across the key performance categories of brightness, color purity, power conservation, and design flexibility.
Color: QD Vision has engineered quantum-dot-based nanocrystal solutions to emit light tuned to frequencies across the visible and infrared spectrum. Because quantum dot materials emit pure, finely tuned colors, the Quantum Light product platform provides better color saturation and color rendering than other technologies, without power consumption trade-offs. It is the only materials technology that can be designed to emit any color of light across the entire visible spectrum.
• Power: The Quantum Light platform can directly emit light and color, using less power than other solutions and making it an attractive option for clean-tech applications. In contrast, LCDs utilize white backlights that are filtered to achieve the desired colors, and consume up to ten times the power of quantum dot-based displays.
• Design: QD Vision’s quantum dot inks can be applied to virtually any substrate using a wide range of well-known printing and coating techniques. The Quantum LightTM product platform therefore opens up new possibilities in the design and manufacture of consumer and industrial products, including the potential for displays, lighting fixtures, and signage with very large areas, thin and contoured forms, or transparent backgrounds.