Nano Bugle

A window into applied science supported by INL

Significant improvements in LED development

Photograph obtained from treehugger.com

Photograph obtained from http://www.treehugger.com

The U.S. patent No. 7399429 registered by the Evident Technologies promises to be a breakthrough in the field of semiconductor materials. This patent relates to the synthesis of semiconductor nanocrystals from III-V materials.

This patent demonstrates the pioneering nature of the company developing novel and proprietary semiconductor nanocrystals, also called quantum dots, assuring a favourable position in the consumer market for such technologies, which already consumed nanocrystal materials developed by Evident Technologies for the development of electronic products.

LEDs are more energy efficient than incandescent lights, but they have a limited range of colours. Although there are techniques that allow changing the colour, the colour range is limited. According to the company, conducting Evident Technologies LED based on quantum dot technology removes these restrictions and allows the LEDs to emit any colour, including high quality white light.

Recently, Evident Technologies has signed an agreement with Holiday Creations that will allow the marketing of a new type of LED based on quantum dot technology. They expect to create new colours and design possibilities for decorative LEDs.

In this field the company QD Vision has announced significant improvements in brightness, efficiency and lifetime in achieving thresholds quantum light emitting dot based devices (QLEDs).

With QLEDs developed by the company, external quantum efficiencies greater than 7% have been achieved and also 25,000 nits of brightness, which is the highest value for a quantum dot LED (25,000 nits). They also said to have reached Luminance efficiency of 3-4 cd/A in levels of high brightness values of 1000 to 10,000 nits, with a lifetime of hundreds to thousands of hours at 100 nits.

QD Vision has reported that their red QLEDs have achieved external quantum efficiencies greater than 7% and brightness the highest achieved for quantum dot LED (25,000 nits). They also have reached Luminance efficiency of 3-4 cd/A in levels of high brightness values of 1000 to 10,000 nits, with a lifetime of hundreds to thousands of hours at 100 nits.

Achieving EQEs greater than 3% means a great progress in development of Cadmium-free QLEDs too.

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February 16, 2009 - Posted by | Nanoelectronics

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