Sunday, 15 April 2018

What Is Full Form Of LED?? And About LED

What Is Full Form Of LED?? And About LED

Here This Article Present Full Form Of LED And All About LED Light And Application Of LED Light!!! 

In a Forward-Biased Diode, free electrons cross the junction and fall into holes.

When they recombine, these free Electrons Radiate Energy as they fall from a higher energy level to a lower one.

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In a Rectifier Diode, the energy is dissipated as heat, but in an LED, the energy is radiated as light

By using elements like gallium, arsenic and phosphorous, a manufacturer can produce LEDs that radiate red, green, yellow, orange, and Infrared Radiation (invisible).

LEDs that produce visible radiation are used in instrument displays, calculators, digital watches, etc.

The infrared (IR) LED finds applications in Burglar-Alarm systems and other areas requiring invisible radiation. Generally, the infrared emitting LEDs are connected with phosphor so that, by the excitation of phosphor, visible light can be produced.

The advantages of using LEDs in electronic displays are.

1). LEDs are very small and can be considered as point sources of light.

They can, therefore, be stacked in a high density matnx to serve as a numeric and Alphanumeric Display

2) The light output from an LED is a function of Current flowing through it. An LED can. therefore, be controlled smoothly by varying the current.

This is particularly useful for operating LED displays under different ambient lighting conditions.

3). LEDs are Highly Efficient emitters of EM radiation. LEDs light output of different colours, i e. red, yellow, amber, and green are commonly available.

4) LEDs are very fast devices, having a turn-on/off time of less than 1 ms.

5) The low Supply Voltage and current requirements of leds make them compatible with TTL ics.

6. LEDs are manufactured with the same type of technology as that used for Transistors and ICs and, therefore, they are economical and have a high degree of reliability

7) LEDs are rugged and can, therefore, withstand shocks and vibrations.They can be operated over a wide range of temperature say, 0-70degree C.

The disadvantage of LEDs compared to LCDs is their High Power requirement.

Also, LEDs are not suited for large area displays, primarily because of their high cost.

Question Related to This Article  :

What is the possible range of current limiting resistor essential for lightening the LED in certain applications after pressing the push-button?
Ans:  220- 330 Ω

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