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Light Sources News
Nichia Claims Brighter White LEDs
Feb 11, 2002 — TOKYO, Feb. 11 -- Nichia Corp. said it has developed surface-mount white LEDs with a luminous intensity fifty percent higher than current parts. The increased brightness results from a more efficient conversion of electricity to emitted white light, making the part useable in backlighting of full-color LCD screens in battery-powered mobile devices, the company said. "Color displays have always been a big improvement over black and white," said Noboru Tazaki, managing director and general...
Florida Groups Develop Energy-Efficient UV LEDs
Dec 1, 2001 — The universities of Florida, South Florida and Central Florida are collaborating with Uniroyal Optoelectronics, a subsidiary of Uniroyal Technology Corp., to develop UV (350 to 400 nm) AlGaInN-based LEDs, which may be the foundation for efficient...
LEDs Learn from Solar Cells
Nov 1, 2001 — A silicon LED with a conversion efficiency 100 times better than current devices promises to enable the integration of LEDs with microchips. The development could eliminate the need for wires for intra- and interchip communication and the electronic...
Laser Light Enables 3-D Doping
KONSTANZ, Germany -- KONSTANZ, Germany -- Laser diodes, light-emitting diodes and photovoltaic cells all have one thing in common: They consist of semiconductor chips, which necessarily contain electronic bandgaps. Light can be used to dope structures at the nanoscale...
Blue LEDs Open Door to Microdisplays
MANHATTAN, Kan. -- MANHATTAN, Kan. -- Physicists at Kansas State University have created a microdisplay based on InGaN/GaN quantum wells that is integrated on a semiconductor chip and is only 0.5 mm square. The group hopes it will pave the way for bright,...
Keeping Up with the LEDs
May 1, 2001 — Light-emitting diodes (LEDs) appear to be everywhere these days. They are used in internal and external automotive lighting applications, traffic lights and some information display systems. But these LEDs are really quasimonochromatic light sources...
What Color Is My LED?
May 1, 2001 — Just about everyone is familiar with light-emitting diodes (LEDs) from their use as indicator lights and numeric displays on consumer electronic devices. Beyond that, low light output and lack of color options have limited the application of LED...
Low-Cost, High-Brightness LEDs Developed
Jan 1, 2001 — Researchers at OSA GmbH of Berlin have developed LEDs that are up to five times brighter than conventional devices and that will cost half as much as other high-brightness LEDs. The company, a subsidiary of SLI Inc. of Canton, Mass., expects to...
LEDs Developed at NASA Found to Have Healing Properties
Dec 20, 2000 — MILWAUKEE, Dec. 20 -- LEDs originally developed for commercial plant growth by NASA have been found to help with slow-healing wounds, such as diabetic skin ulcers, serious burns and severe oral sores caused by chemotherapy and radiation, according...
Microdisc LEDs Boast Higher Efficiencies
Dec 1, 2000 — Physicists at Kansas State University in Manhattan have developed LEDs with a novel architecture that display emission efficiencies greater than conventional devices. The interconnected microdisc LEDs, which the team describes in the Nov. 13 issue...
AXT Receives First Big Order for Green and Cyan LEDs
Sep 19, 2000 — FREMONT, Calif., Sept. 19 -- American Xtal Technology (AXT) Inc. has received a multimillion-dollar contract to provide green and cyan LEDs over a six-month period to an undisclosed customer. AXT designs, develops, manufactures and markets...
Dopant Level Improves Organic LEDs
Aug 1, 2000 — A team from Ludwig Maximilian Universität in Munich, Institut Ackermannweg in Mainz and Universität Potsdam, all in Germany, has announced the results of a study of organic LEDs that may boost the efficiency and output of the devices....
LEDs Shrink Displays
Aug 1, 2000 — Microvision Inc. of Bothell, Wash., has completed the initial tests of its miniature retinal-scanning display. The device, which uses micromirrors to focus the output of three edge-emitting LEDs into the wearer’s eye, will be distributed in a...
LEDs Offer Fast Data Transmission
TAMPERE, Finland -- TAMPERE, Finland -- With properties somewhere between a standard LED and a laser diode, resonant-cavity LEDs produce intense light from quantum wells. Compared with conventional LEDs, the resonant-cavity variety produces a brighter, more directional...
Thorough Testing Produces Fiber Lighting System
Jul 1, 2000 — A fiber optic distributed lighting system can illuminate exterior door handles, puddle lamps and running boards in vehicles, eliminating the need for incandescent lamps or light-emitting diodes in these high-moisture, -shock and -vibration areas....
LEDs Benefit from Interface Engineering
Jun 1, 2000 — A research group from the UK, Germany and Singapore describes the production of efficient polymer LEDs by molecular-scale interface engineering in the March 30 issue of Nature.A series of green-emitting devices displayed an external forward...
Epichem Produces Mid-IR Laser Diodes and LEDs
Apr 1, 2000 — Wirral, UK-based Epichem Ltd. has announced that it has fabricated mid-IR LEDs and laser diodes with its Admiral Consortium partners Aixtron AG, RWTH Aachen, Université Montpellier II and the IP-Czech Academy of Science. The Sb-based devices...
Nitres Reports High-Efficiency LEDs
Apr 1, 2000 — Researchers from Nitres Inc. of Westlake Village, Calif., have announced that they have developed an InGaN-based LED with a quantum efficiency of 20 percent. The near-UV/violet diode displays 405-nm emission, and has an output of 12 mW at 20 mA and...
Cree Gets Microvision Funding for Laser, LED Development
Mar 22, 2000 — DURHAM, N.C., Mar. 22 -- Cree Inc. has received a commitment from Bothell, Wash.-based Microvision Inc. for an additional $10 million in funding for further development of light-emitting diodes and continuous-wave blue and green laser devices...
Cree Research Receives LED Orders from Asia
Jan 4, 2000 — DURHAM, N.C., Jan. 4 -- Cree Research Inc. has received $14 million in orders for light-emitting diode devices from customers in several Asian countries. The high-brightness LEDs are to be employed in applications targeting displays, cellular...
Cree Wins LED Orders;Calls Infringement Claim Groundless
Dec 13, 1999 — DURHAM, N.C., Dec. 13 -- Cree Research Inc. has received $22 million in new orders for light-emitting diode devices. The company reported that the new orders were placed primarily by Taiwanese customers. Cree also announced that Sumitomo Corp.,...
Optoelectronic Devices Go Organic
CAMBRIDGE, UK -- CAMBRIDGE, UK -- Light-emitting diodes made from organic polymers were first developed at Cavendish Laboratory a decade ago. Now researchers at Cavendish have taken this technology a step further. The light that is emitted from these devices is...
Organic LEDs May Improve Microdisplays
Aug 1, 1999 — Organic light-emitting diodes (LED) offer several key advantages over conventional LEDs. Their high efficiency and resolution make them well-suited for integration on silicon integrated circuits and high-performance microdisplay systems. Fed Corp....
Dye Improves Efficiency of Organic LEDs
Jan 1, 1999 — A team of researchers from Princeton University in New Jersey has improved the efficiency of electroluminescent organic light-emitting diodes (LEDs) by introducing a fluorescent dye. Fluorescence emissions occur when electrons become excited,...
Researchers Use Ion Implantation to Make LEDs
Aug 1, 1998 — Implant Sciences Corp., based in Wakefield, Mass., has pioneered the use of ion implantation in the manufacture of gallium nitride blue light-emitting diodes (LEDs). To embed ions into a material, scientists use a linear accelerator to create a beam...
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