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QD Vision breaks QLED efficiency barriers

16th May 2013
The firm's CdSe-CdS emitters are suited to applications such as electronic displays and solid-state lighting
QD Vision, a manufacturer of 'Color IQ' optical components for LCD applications, says it has made a breakthrough in next generation quantum dot light emitting devices (QLEDs), which are currently in the advanced development stage.

QLEDs are a quantum dot-based light emitting technology, which in the future will be used in applications such as electronic displays and solid-state lighting.

Semiconductor nanocrystal technology that emits light very precisely. So when it’s used in LCD screens like TVs, you see a more dynamic range of colours and the true, natural palette encoded in the picture. QD Vision says Color IQ adds up to 50 percent more colour into the TV picture

The firm's QLEDS are composed of an inverted organic-inorganic hybrid device structure and colloidal CdSe-CdS (core-shell) quantum-dot emitters. The strong electronic coupling of quantum dots to an adjacent layer of ZnO nanocrystals (which form the electron transport layer) facilitates charge transfer, which is responsible for both injecting electrons and maintaining an optimal charge balance for the quantum dot emitters.

QD Vision’s latest QLED performance results have been published in the 21st April 2013 issue o fNature Photonics. In the article, QD Vision reports achieving 18 percent External Quantum Efficiency which puts QLEDs near the fundamental efficiency limit of the technology.

The firm claims these results are double the efficiency of previously reported QLED devices.

QD Vision says its current and luminous power efficiency are better than the best evaporated OLED result of the same colour coordinate, and significantly better than what solution-processed OLEDs have thus far achieved.

“This paper clearly demonstrates the fundamental efficiency advantage that QLEDs have over any other emissive display technology. Achieving this milestone is a great breakthrough and the result of years of hard work and dedication to achieving what others may have thought impossible,” says QD Vision co-founder Seth Coe-Sullivan.

While at an earlier stage of development and commercialisation than QD Vision’s Color IQ products, QLED performance is already suitable for use in certain products that require precision colour solutions in an ultra-slim form factor. These include monochrome visible and infrared displays, and lighting devices for machine and night vision applications.

Further details of this work have been published in the paper, "High-efficiency quantum-dot light-emitting devices with enhanced charge injection," by Benjamin S. Mashfordet al in Nature Photonics (2013), 407-412. DOI:10.1038/nphoton.2013.70

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