The material composition of the semiconducting element of an LED determines its color and not coloring of the package (outer body). In market they are available in two types 1) Colored variants 2) Transparent variants. A little variation in the composition determines the color of the emitted light rays.
The two main types of materials used in LEDs are:
1) Aluminum gallium indium phosphide (AlGaInP, sometimes rearranged as AlInGaP) alloys for use in red, orange and yellow LEDs.
2) Indium gallium nitride (InGaN) alloys used in green, blue and white LEDs.
Simple LED colors:
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