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MHT CET Medical202624 April 2026Evening ShiftPhysicsSemiconductorsActual

To emit red or green light, LED is manufactured using

Options

  1. Aaluminum gallium arsenide.
  2. Bzinc selenide.
  3. Cgallium arsenic phosphide.
  4. Daluminum gallium phosphide

Correct answer

C. gallium arsenic phosphide.

Step-by-step solution

Light Emitting Diodes (LEDs) require semiconductors with a specific band gap to emit visible light (typically between 1.8 eV and 3.0 eV ). The compound semiconductor Gallium Arsenic Phosphide ( GaAs_ 1-x P_x ) is widely used for manufacturing LEDs of various colours. The emission wavelength depends on the band gap, which can be tuned by varying the composition ratio of Arsenic to Phosphorus ( x ). For instance, GaAs_ 0.6 P_ 0.4 has a band gap of approximately 1.9 eV and is used to emit red light. By increasing the

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