How do LED lights change color?
by 
ChillyPhilly10
ANSWERS: 3
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A single light-emitting diode (LED) is only capable of emitting a single wavelength of light. Like all diodes an LED conducts current in one direction but not the other. It acts as either a short circuit (emitting light) or an open circuit (doing nothing), depending on whether the voltage is positive or negative. A so-called bipolar LED puts a green LED and a red LED together, but in opposite orientations. When voltage is positive it emits green. When voltage is negative it emits red. (Maybe the other way around.) To change colors, you reverse the voltage. Bonus: There's a 3rd color possible with this arrangement, due to a trick involving the human eye. If the LED rapidly alternates between red & green (feeding it a bipolar square wave) your visual system will perceive it as yellow, much as it would a mixture of red and green light.
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The color of a LED (blinking or not) is set by the process used to manufacture it. Once made, color cannot be changed. If it's a multi LED, which is actually 3 LEDs in one package, you should have said so.
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To make it really simple,the wavelengths of light is responsible for its color.We get different color of LEDs or same LED change color by variation of voltage across it's terminals.If you need more explanation,get back to me through the comment section.
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