[nanoPost] New LED colors and application flexibility with quantum dots

Company USA

Quantum Dots for Application Flexibility, Color Tunability, Improved Color Rendering

The company has developed proprietary quantum dot technologies that can be used to create improved LED devices. Quantum dots are narrowband emitters that are tunable throughout the visible portion of the spectrum. In addition, quantum dots are broadband absorbers that can be used with multiple types of underlying short wavelength (UV, violet, blue) light sources. These properties make them ideal for lighting applications.

The company's quantum dots LED innovations enable improved color targeting, quality and consistency with a high degree of flexibility for processing methods. The company's patented technologies can produce nearly any color distinguishable by the human eye, including warm and cool shades of white light, saturated colors, greens, pinks, purples, and pastels. These quantum dots can be applied to LEDs, molded into fluorescent components and light guides, or printed onto any substrate.

The company's proprietary quantum dot nanophosphor technology is available for licensing and product development across a variety of growing markets. Applications include specialty colors and white light for keypad lighting, display backlights, mobile phone flash lamps, branded colors, signage and architectural lighting, automotive lighting, flat panel liquid crystal displays (LCD), projection displays, projectors, mood lighting, and general illumination markets.

How Quantum Dots Can Solve Lighting Problems

Quantum dots are nanoscale semiconductor particles composed of periodic element groups of II-VI, III-V, or IV-VI that can be tuned to brightly fluoresce at virtually any wavelength in the visible and infrared portions of the spectrum when illuminated by a shorter wavelength source. Quantum yields are in excess of 80% and the emission spectrum is bell shaped with a full-width-half-max (FWHM) of 35nm or 70nm depending on the quantum dot composition.

Although quantum dots have narrow band emission, they are broadband absorbers and can be excited with any light source having a wavelength shorter than the quantum dot emission. For example, "red" emitting quantum dots can be excited with orange, yellow, green, blue, violet, and UV sources, while "green" emitting quantum dots can be excited with blue, violet, and UV sources.

The company has developed patent protected technologies that allow us to disperse our quantum dots into a number of polymeric materials including standard LED thermal curing encapsulant materials (silicones and epoxies), injection moldable polymers, printable matrix materials, and semiconductor conjugated polymers. Our quantum dot composites can be applied to LEDs, molded into fluorescent components and light guides, or printed onto any substrate.

Proprietary Applications of Quantum Dots in LEDs/ Displays
Specialty Color LEDs

The company has developed color targeting nanophosphor technology comprising quantum dots dispersed in thermal curable silicone and epoxies with emission wavelengths ranging from 520nm to 620nm. LEDs made from these products can reach precise specialty colors not possible to achieve with conventional phosphor technology and are ideally suited for corporate branded colors, signage, channel, architectural and seasonal lighting.

The company's LED quantum dot materials can be combined and applied onto "blue emitting" 460-470nm InGaN LEDs, 405-410nm violet LEDs, 390nm UV LEDs, UV emitting black lights and mercury vapor lamps to achieve nearly any color coordinate within the chromaticity diagram.

The company's nanophosphors are very efficient and have been shown to convert greater than 70% of the light generated by the underlying LED to the desired colors. In fact, green LEDs made with 520 and 540nm emitting quantum dots on blue and violet LEDs have efficiencies that exceed commercial green emitting LED chips alone.

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