news digest ♦ LEDs balance for the quantum dot emitters.
QD Vision’s latest QLED performance results have been published in the 21st April 2013 issue o fNaturePhotonics. 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
Rubicon to showcase optical- grade sapphire products
The provider of sapphire substrates and products to the LED, semiconductor, and optical markets will exhibit its products at the Laser World of Photonics in Munich, Germany 21st Laser World of Photonics Show
Rubicon Technology will show off its line of optical products for use in defence and aerospace, instrumentation and analytical processing, sensors and detectors, semiconductor process equipment, and medical and laser applications at the 21st Laser World of Photonics International Trade Fair.
LUXEON 3535 2D LED module Sapphire can be used as a component in electro-optic 82
www.compoundsemiconductor.net June 2013
products used to detect or measure the presence or features of light in a number of optical applications. Rubicon provides a wide range of sapphire products that can be integrated into existing opto-electronic applications including sapphire cores, ingots, windows and blanks.
“As opto-electronic technology and applications evolve, the demand for optical-grade, high-quality sapphire has grown,” says Raja M. Parvez, President and CEO, Rubicon Technology. “Based on sapphire’s unique strength and hardness, chemical inertness, and transparency in the visible and IR spectrum, there’s growing interest in using sapphire in products that are used to detect or measure light. Sapphire becomes very desirable in extreme environments such as military and industrial applications where material durability is just as important as optical clarity.”
Until now, existing methods used to produce optical- grade sapphire windows haven’t met demands for thickness and size in certain military and other applications. The company recently developed a new horizontal growth process to produce monolithic sapphire sheets large enough for use in next generation optical windows for military and industrial applications.
Rubicon will have a number of optical sapphire products of different sizes and orientations on display in Hall B2, Stand #163 at Laser World of Photonics, including sapphire cores, ingots, windows, domes and blanks. Rubicon will also be displaying large diameter wafers ranging in size from 4, 6 and 8 inches.
Philips halves LED count in retrofit lamps
Lumileds’ latest innovation in mid-power III-nitride LEDs achieves up to 140 lm/W efficacy
Philips Lumileds has launched the LUXEON 3535 2D, which combines two LED chips in one package.
The device enables reduction in LED count and cost of designing retrofit lamps, consumer downlights and diffuse industrial lamps.
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