Phosphors for LEDs

With the recent advent of efficient blue LEDs the opportunity to produce white emitting LEDs is now present. As a result, Phosphors for LEDs have entered exciting times.

White LEDs are made by coating blue LEDs with a phosphor. A proportion of the blue light emitted is absorbed by the phosphor and converted to another colour. Light is therefore emitted across the whole of the visible spectrum. Typically one or two phosphors are used to convert the blue to white. Either a single broad yellow phosphor or a combination of green and red will produce the desired effect.