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When were LEDs first used?

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First demonstrated in 1962 and appearing in a commercial product in 1968, LEDs were limited to small applications until 1985, when more powerful LEDs were produced. Their major limitation was that only red and green microchips were possible. However, in 1993, researchers at several universities in the United States and Japan developed an LED that produced blue light that, in conjunction with the red and green chips, could produce white light; this made the LED a major player in illumination technology.

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