The LED is usually made of………………………… a. C and Si b. GeSi c. GaAs d. None os these

Break Down the Problem

1. Identify the options provided for the materials used in the construction of LEDs.
2. Recall the common materials known for making LEDs.

Relevant Concepts

• LEDs (Light Emitting Diodes) are commonly made from semiconductor materials. The properties of the materials determine the wavelength (color) of the light emitted.

Analysis and Detail

1. C and Si: Carbon (C) is not typically used in LED manufacturing, while Silicon (Si) is mainly used in electronic devices but not primarily in emitting light.
2. GeSi: Germanium-Silicon (GeSi) is also not a common material for LEDs, though Germanium has semiconductor properties.
3. GaAs: Gallium Arsenide (GaAs) is well-known for its use in high-efficiency LEDs, especially in infrared light-emitting applications.

Verify and Summarize

Upon analyzing the given options, GaAs is the well-established material for making light-emitting diodes, particularly for efficient performance in specific applications.

Final Answer

c. GaAs