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Light Sources News
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 beam with higher spectral purity and modulation speed, making it suitable for use in plastic optical fiber short-haul communications. Tampere University’s 650-nm resonant-cavity LED could be useful for high-speed, short-haul data...
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...
LEDs Put Railroad Lighting on More Efficient Track
Jul 1, 1998 — Using light-emitting diodes (LEDs) to replace colored tungsten filament bulbs for their signals could help railway companies cut costs and reduce risks for maintenance crews. LED signals developed by Costas Tsakonas (left) and George Bearfield...
Blue Lasers Meet Tough Commercial Requirements
May 1, 1998 — Light-emitting diodes (LEDs) and laser diodes with wavelengths below the red ( Gallium nitride and other III-V nitride-based semiconductors have a direct band gap that is suitable for blue light-emitting devices. The band gap energy of aluminum...
Silicon Glows With Iron 'Islands'
Sep 1, 1997 — GUILDFORD, UK -- Integrated optical devices are the ultimate application for a 1.54-µm light-emitting diode (LED) structure built in a conventional silicon diode junction. While compound semiconductor LEDs based on gallium arsenide abound, an...
Researchers Predict Multicolor LED World
Jun 1, 1997 — ROCHESTER, N.Y. -- Dreams of ultrathin displays for computer and television screens could become a reality, thanks to a plastic light-emitting diode that emits light in several colors.LEDs are everywhere; clock radios, microwave timers, dashboard...
Zinc Oxide Holds Promise as LED Material
Jun 1, 1997 — In the quest to produce efficient and lasting blue light-emitting diodes, one material has been largely overlooked -- zinc oxide.Although ZnO has a room-temperature band gap of 3.37 eV and high exciton binding energy, scientists have focused more on...
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August 2024
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