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becoz Si and Ge are indirect bandgap semiconductors. for lasing action direct bandgap semiconductors are required of the type In Ga As P

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βˆ™ 11y ago
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βˆ™ 5mo ago

Silicon and germanium are indirect bandgap materials, which means they are not efficient in emitting light when an electric current passes through them. Laser diodes require direct bandgap materials such as gallium arsenide or indium phosphide, which are more efficient in converting electrical energy into light.

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Q: Why we can't use silicon and germanium in laser diode?
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