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What material did Atalla research for LEDs?

Silicon
Gallium arsenide phosphide
Germanium
Silicon carbide

Answer

Gallium arsenide phosphide was the material researched by Atalla for LEDs. This compound semiconductor material is composed of gallium, arsenic, and phosphorus atoms. It has a direct bandgap, which means that electrons can easily recombine with holes, releasing energy in the form of light. This property makes gallium arsenide phosphide an ideal material for LEDs, which are devices that emit light when an electric current passes through them.