Question
Download Solution PDFWhich of the following elements is NOT suitable for the fabrication of a light emitting diode structure?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Germanium.
Key Points
- Silicon and germanium are not suitable because those junctions produce heat and no appreciable IR or visible light.
- Hence Germanium is NOT suitable for the fabrication of a light-emitting diode structure.
Additional Information
- The LED (light-emitting diode) is a PN junction device that emits light when a current passes through it in the forward direction, i.e. when LED is forward biased, it emits light.
- In an LED, this energy lies in the visible region of electromagnetic radiation, and the photon released is perceived as light.
- The compound semiconductor Gallium Arsenide – Phosphide is used for making LEDs of different colours.
- Gallium Arsenide is used for making infrared LED.
- Gallium phosphide, Indium gallium nitride, and Gallium arsenide are used for the fabrication of a light-emitting diode.
- LEDs are generally fabricated with Direct Band Gap (DBG) semiconductors like GaAs, GaAsP, and GaP.
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