Physics - Semiconductors Question with Solution | TestHub
To emit red or green light, LED is manufactured using
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Answer:
Solution:
Light Emitting Diodes (LEDs) require semiconductors with a specific band gap to emit visible light (typically between and ).
The compound semiconductor Gallium Arsenic Phosphide () 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 ().
For instance, has a band gap of approximately and is used to emit red light. By increasing the phosphorus content, the band gap increases, allowing the LED to emit higher-energy visible light, such as green.
Therefore, Gallium Arsenic Phosphide is used to manufacture LEDs that emit red or green light.
Answer: gallium arsenic phosphide.
