LED

LED:

LED technology has now been developed to the point where there are many different types of LED .

The different types of LED find applications in different areas, each being particularly suitable for a specific area .

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Consequently , it has many new areas of LED development opened in recent years , causing a considerable degree of development and production of LED ‘s is one of the fastest growing sectors in the electronic parts industry.

LED technology is widely used in the electronics equipment. Not only that, but LED technology in the years except that developed as an indicator electronics, the technology used in the display and lighting.

The rapid development has asked the question what LED technology can be used for the next.

In fact, more than 30 billion LEDs produced annually and this number is increasing. With the development of new types of LED to white and blue light produce more likely to find applications. Production of the diodes is likely to increase further.

LED’s are used in a variety of applications. One of their first applications as small indicator lights. They are also used in the alphanumeric display, even in this particular application they are replaced by other forms of display. Recent advances in light-emitting diodes are used in place of incandescent lamps for illumination. In these and many other applications. LEDs are widely used and are expected to remain so for years to come.

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LED Operation:

The LED is a specialized form of PN junction having a node connection. Semiconductor material for the compound must be a compound semiconductor. Most commonly used semiconductor materials such as silicon and germanium are simple elements and junction made from these materials emit no light. Instead, compound semiconductors such as gallium arsenide, indium phosphide and gallium phosphide compound semiconductors made of these materials, and intersections emit light.

The compound semiconductors are classified according to the valence band to take their nationals. For gallium arsenide, gallium arsenic a valence of three and a valency of five, and this is what called a III-V semiconductor, and there are a number of other semiconductors which fit category. It is also possible to semiconductors is formed from the group III-V materials.

Diode Function:

The diode emits light when it is biased forwards. When a voltage across the junction is used they are forward biased current as in the case of making each PN junction. Holes from the p-type region and electrons from the n-type field performs the connection and recombine as a normal diode to flow in the current state. When this occurs, energy is released, some of which are in the form of photons.

How it Works?

It turned out that most of the light is produced from the area near the intersection of P-type region. As a result of the design of the diodes made in such a way that this area is so close to be ensured at the surface of the device that the minimum amount of light absorbed by the structure.

In order to light the compound is to be optimized can be seen and the right materials are selected to produce. Pure gallium arsenide infrared energy release read that part of the spectrum. In order to bring the emission of light in the visible red end of the spectrum is added aluminum semiconductor aluminum gallium arsenide (AlGaAs) provide. Phosphorus may also be added to give a red light. used for other colors other materials. For example, Galium phoshide clears and aluminum indium gallium phosphide is used for yellow and orange light. Most LEDs are semiconductors based.

untitledCircuit Design:

A circuit of a LED, behaves very much like a different diode . When used in this manner, a current-limiting resistor , there must be placed in the circuit . This must be calculated to deliver the required power. For many devices need a current of about 20 mA. Although it is often possible to run at a lower current. If there is less power is released, the device will obviously be dimmer. In the calculation of the amount of current drawn by the voltage across the LED itself can be taken into account . The voltage across a forward-biased LED on the condition slightly more than one volt, although the precise voltage depends on the diode , and in particular the color. Often, a red with a forward voltage of less than 2 volts.

Point of Consideration:

Great care should be dispensed to a reverse bias voltage is applied to the diode . Usually, they only have a reverse breakdown of a few volts . If breakdown occurs, the LED will be destroyed. To prevent this , an ordinary silicon diode across the LED can be placed applied in the reverse direction to prevent a reverse bias .

Although LEDs continuously widely used as indicator lamps is small, the number of applications will find increasing as technology improves . New high brightness diodes are available now. They are also used as a means of lighting. An application in which they had previously not possible to perform due to the low light output . New colors are introduced. Blue and white LEDs , previously difficult to produce are now available.

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Posted by on Jul 16 2016. Filed under Latest Updates, Home Appliance, ELECTRICAL & ELECTRONICS, Lighting Solutions. You can follow any responses to this entry through the RSS 2.0. You can leave a response or trackback to this entry

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