Blue LEDs light disks, bulbs, displays

Whether for night- and general lighting, or in traffic lights (both road and railway) and even full-color TV displays as in Japan, applying blue light-emitting diodes is now a realistic endeavor. Other applications consider the esthetics and economy: they are a cost-effective solution in automotives and sign boards. Entwined with this basic optical application is an area of red-hot activity: white-light LEDs, formed by combining blue LEDs in the same package with various phosphors and/or plastics to undercut the overall cost (especially maintenance) of traditional halogen, incandescent and fluorescent bulbs and lamps.