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Light Sources News
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 should cut costs and reduce risks for railway companies. Engineering firm Signal House has developed LED signals that can meet the visibility requirements for this task and that are also expected to last 120 times longer than their traditional...
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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April 2024
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