Elementary semiconductors are not used to make visible LED because

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They have low conductivity

They have low boiling point

They have band gap such that emissions are in IR region

They have low melting point

answer is D.

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Detailed Solution

In elemental conductor, the band gap is such that the emissions are in infrared region and not in visible region. Because the energy released by combination of holes and electrons in elemental semiconductors does not lie in the visible spectrum, elemental semiconductor cannot be used to make visible LED's .

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