Definition of LED

We have it in our phones, cars, and even our homes. When something electronic turns on, there’s a strong probability an LED is to blame. They’re available in a wide range of sizes, shapes, and colors, but they all have one thing in common: they’re the bacon of electronics. They’re commonly advertised as being able to improve any job, and they’re frequently used in unusual places. Nick Holonyak, who was working for General Electric, came up with the idea for a light-emitting diode in 1962. LEDs are a specific form of diode with electrical characteristics comparable to PN junction diodes. As a result, the LED permits current to flow in one direction while blocking current flow in the othering Diode (LED Lights)

The “Light Emitting Diode,” or LED, as it is more widely known, is essentially a specialized diode with electrical characteristics similar to those of a PN junction diode. This indicates that an LED will pass current in one direction but will not allow current to flow in the opposite direction.

Light-emitting diodes (LEDs) are manufactured from a thin layer of rather heavily doped semiconductor material when forward biassed. Depending on the semiconductor material used and the doping level, they produce a colored light at a specific spectral wavelength.

When an electric current runs through a Light Emitting Diode (LED), it emits light. Light is produced when holes form p-type semiconductors recombine with electrons from n-type semiconductors. The wavelength of the light emitted is determined by the semiconductor material’s bandgap. Wider bandgaps are found in harder materials with stronger molecular connections. Ultra-wide bandgap semiconductors are aluminum nitride semiconductors.

The following are the most significant advantages of LEDs in electronic displays:

• The LEDs are smaller and can be layered together in a high-density matrix to generate numeric and alphanumeric displays.
• The LED’s light output intensity is determined by the current flowing through it. Their light intensity can be smoothly adjusted.
• Some LEDs emit light in various colors, including red, yellow, green, and amber.
• The LED’s on and off period, also known as switching time, is less than one millisecond. As a result, the LEDs are utilized in dynamic operations.
• Because they are made using the same technology, LEDs are incredibly cost-effective and provide a high level of reliability.
• The LEDs can be used in various temperatures, such as 0° to 70°. It’s also extremely resilient, with the ability to tolerate shock and change.
• Although LEDs have great efficiency, they only require moderate power to operate. For full brightness, a voltage of 1.2V and a current of 20mA are usually required. As a result, it is employed in locations with little power.

Working of Light Emitting Diode 

The quantum theory governs the operation of the LED. According to quantum theory, as an electron’s energy decreases from a higher to a lower level, it emits energy in the form of photons. The photon’s energy equals the difference between the higher and lower levels. The LED is wired in a forward biassed configuration, allowing current to flow in the desired direction. The migration of electrons in the opposite direction causes electricity to flow. The electrons travel from the conduction band to the valence band and emit electromagnetic energy in the form of photons resulting from recombination. Photons have the same energy as the gap between the valence and conduction bands.

Applications of LED and its uses

Many Light Emitting Diode(LED) applications in normal daily life. The following are some of the applications:

• LED has a wide range of uses, some of which are listed here.
• LED bulbs are utilized in both homes and businesses.
• Motorcycles and automobiles employ light-emitting diodes.
• These are used to display messages on mobile phones.
• LEDs are utilized at traffic light signals.

Conclusion

The article provides an overview of the working principle and application of light-emitting diode circuits. Reading this article has provided you with some basic and operational knowledge of the light-emitting diode. Light Emitting Diodes, or simply LEDs, are one of the most widely used forms of semiconductor diodes accessible today and are commonly seen in televisions and color displays.