LED'S are made of compound semiconductor and not by elemental semiconductor.?

The elemental semiconductors band gap is such that the wavelength of light emitted lies in infrared region third cannot be used for LED. Light produced by compound semiconductors in his invisible Region and thus used for LEDs.
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the elemental semiconductors is such that the wavelength of light emitted lies in infrared region and hence is not visible while in compound semiconductors the wavelength of light lies in visible region and hence compound semiconductors are used for leds and not elemental semiconductors
 
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Why do we use compound semiconductor for LED
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