Zener and Light Emitting Diodes: Principles and Applications in Electronic

This comprehensive lecture, prepared by Dr. G.S. Virdi, Ex Chief Scientist in microelectronics, provides an in-depth exploration of two critical special purpose diodes: the Zener Diode and the Light Emitting Diode (LED).


Key Learning Outcomes for Engineering Students:
Zener Diode (Voltage Stabilization)

Fundamental Definition: Understand the Zener diode as a heavily-doped semiconductor device.




Operating Principle: Grasp its operation under reverse bias where a large reverse current flows at a critical reverse voltage.



Voltage Regulation: Learn how the Zener diode acts as an essential voltage regulator or stabilizer.



Breakdown Region: Analyze the characteristics and necessity of operating the Zener diode in the breakdown region to maintain a constant output voltage, and how external circuitry limits the current.




Materials: Review the base materials used in semiconductor technology, such as Silicon and Germanium.

Light Emitting Diode (LED)

LED Mechanics: Learn that the LED is a semiconductor device that emits light when current passes through it.


Electrons and Holes: Discover how light is produced when electrons and holes recombine within the semiconductor material.


Structure: Examine the fundamental structure and the different layers involved in an LED.

This presentation is ideal for students seeking to understand the function, characteristic curves, and practical application of these crucial electronic components in circuit design.

1. Special Purpose Diodes
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Special Purpose Diodes
Zener Diode
Light Emitting Diode
Schottky Diode
Varactor Diode
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3. Special Purpose Diodes
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Zener Diode
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ZENER DIODE
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5. ZENER DIODE
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ZENER DIODE
High Doping
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7. Depletion Layer : Thick
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ZENER DIODE
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8. ZENER DIODE
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9. ZENER DIODE
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ZENER DIODE-Example
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ZENER DIODE-Example
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12. ZENER DIODE
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ZENER DIODE-Example
Water Tank
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14. ZENER DIODE
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15. ZENER DIODE
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17. ZENER DIODE
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ZENER DIODE
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20. ZENER DIODE
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21. ZENER DIODE
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Thought of the Day
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23. Special Purpose Diodes
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Symbol of LED

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Thought of the Day
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45. ZENER DIODE
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Thank you