What is the Difference Between Rectifier Diode and LED?

The main difference between a rectifier diode and an LED (Light Emitting Diode) lies in their ability to emit light and their applications. Here are the key differences between the two:

1. Light Emission: LEDs emit light when conducting, whereas rectifier diodes do not emit light. This is because LEDs are specifically designed and fabricated to release energy in the form of photons (light particles) when electrons and holes in the P-N junction neutralize each other.
2. Applications: LEDs are often used as light sources due to their energy efficiency, durability, and smaller size. They are commonly found in various lighting applications, such as environmentally friendly LED light sources. On the other hand, rectifier diodes are used in rectifying applications, converting alternating current into direct current.
3. Materials: The materials used in rectifier diodes and LEDs have different properties. Rectifier diodes are made of semiconductor materials like silicon or germanium, while LEDs are made of special materials like gallium arsenide or gallium phosphide, which have electrons that emit light when energized.
4. On-State Voltage: The on-state voltage for rectifier diodes is typically 0.7V for silicon diodes and 0.3V for germanium diodes. In contrast, LEDs have a higher on-state voltage, usually ranging between 1.2V and 2.0V.
5. Reverse Breakdown Voltage: Rectifier diodes have a higher reverse breakdown voltage, which allows current to conduct in reverse bias, while LEDs have a lower reverse breakdown voltage.

Comparative Table: Rectifier Diode vs LED

In summary, a rectifier diode is designed to convert AC to DC and has a larger junction area, while an LED is designed to emit light when current passes through it and has a smaller junction area. The differences in design and materials between the two result in the distinct functions of each component.