How do people make colored LEDs?

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Re: Colored LEDs?

The color of the light from an LED is determined by the bandgap of the semiconductor used. However, the light from the semiconductor is monochromatic.

http://www.trainweb.org/girr/tips/tips7/white_led_tips.html

"White light contains all colors and cannot be directly created by a single LED. The most common form of "white" LED really isn't white. Its a Gallium Nitride blue LED coated with a phosphor that, when excited by the blue LED light, emits a broad range spectrum that in addition to the blue emission, makes a fairly white light."
 

    eecs4ever

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