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QD Vision Develops 'first' 30 Nm FWHM Quantum Dots

The firm's CdSe-CdS emitters are suited to applications such as electronic displays and solid-state lighting
QD Vision has announced the commercial availability of what it says is the industry’s first green quantum dots (QD) at 30 nm Full-Width Half-Maximum (FWHM).

QD Vision claims its new 30 nm green QDs and enable display manufacturers to benefit from increased performance when developing high-brightness, full-gamut colour displays.  

The firm's  LCD products, where blue LED’s are used together with red and green QDs emit spectrally narrow red, green and blue colours to obtain full-gamut colour at a good efficiency.

By controlling the FWHM of the QD emission through manufacturing processes, QD Vision says its green and red QDs deliver the necessary colour saturation to achieve 100 percent overlap of any major colour gamut standard. These new 30 nm FWHM 'Color IQ' optics will further improve the colour performance in LCD applications, such as TVs, monitors and all-in-one computers.

“QD Vision continues to keep quantum dots on the leading edge of display technology," says John Ritter, Executive Vice President of Product Development, QD Vision. “Our solutions offer the best down-conversion material on the market today, and we continue to develop even narrower FWHM products to produce the most saturated colours at the highest efficiencies for our customers, both now and in the future."

QDs are semiconductor nanocrystals that possess unique light emitting optical properties. The emission wavelength spectrum of QD light can be tuned to create almost any colour of the visible spectrum as defined by the CIE 1931 colour space.

FWHM, is a simple and well-defined specification used to measure the narrowness (spectral purity) of the emission from light emitting materials, such as QDs. In short, a narrower QD emission produces a wider colour gamut, resulting in higher colour fidelity and improved backlight performance.

When used in an LCD product, the backlight emission passes through a colour filter. Some colour filters allow light leakage from one colour channel to another, resulting in de-saturated colours.

Unlike conventional phosphors with much broader light emission (e.g. FWHM ~ 60-100 nm), QDs have a narrower emission spectra, which helps to reduce the crosstalk between the colour channels and improve system efficiency. Also unlike phosphors, the individual emission spectrum of QDs can be fine-tuned to match the peak wavelength of a given colour filter to achieve the maximum gamut possible.

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