Electric Potential Difference Across The Led Leads example essay topic

Q: What is LED (Light Emitting Diode)? A: LED (Light Emitting Diode) is the most commonly used backlight for Cellular phones. The LED backlight offers some benefits over the EL backlight. To start, the LED backlight does not require an inverter, just a DC source of +3 VDC~+5 VDC. Secondly, depending on the backlight configuration, the brightness can very bright, and thirdly, the life of the LED exceeds 50 K hours. web FAQS. asp#17 Abbreviation of light emitting diode, an electronic device that lights up when electricity is passed through it. LEDs are usually red.

They are good for displaying images because they can be relatively small, and they do not burn out. web light therapy. htm small indicator light most often used to show the power is on or the device is being used. LEDs are found on your computer case, monitor, printer, modem, CD-ROM drive, and hard drive. What is Inside an LED? LED's are special diodes that emit light when connected in a circuit.

They are frequently used as 'pilot' lights in electronic appliances to indicate whether the circuit is closed or not. A a clear (or often colored) epoxy case enclosed the heart of an LED, the semi-conductor chip. LED leads side lead on flat side of bulb = negative The two wires extending below the LED epoxy enclosure, or the 'bulb' indicate how the LED should be connected into a circuit. The negative side of an LED lead is indicated in two ways: 1) by the flat side of the bulb, and 2) by the shorter of the two wires extending from the LED.

The negative lead should be connected to the negative terminal of a battery. LED's operate at relative low voltages between about 1 and 4 volts, and draw currents between about 10 and 40 milliamperes. Voltages and currents substantially above these values can melt a LED chip. The most important part of a light emitting diode (LED) is the semi-conductor chip located in the center of the bulb as shown at the right.

The chip has two regions separated by a junction. The p region is dominated by positive electric charges, and the n region is dominated by negative electric charges. The junction acts as a barrier to the flow of electrons between the p and the n regions. Only when sufficient voltage is applied to the semi-conductor chip, can the current flow, and the electrons cross the junction into the p region. In the absence of a large enough electric potential difference (voltage) across the LED leads, the junction presents an electric potential barrier to the flow of electrons. What Causes the LED to Emit Light and What Determines the Color of the Light?

When sufficient voltage is applied to the chip across the leads of the LED, electrons can move easily in only one direction across the junction between the p and n regions. In the p region there are many more positive than negative charges. In the n region the electrons are more numerous than the positive electric charges. When a voltage is applied and the current starts to flow, electrons in the n region have sufficient energy to move across the junction into the p region. Once in the p region the electrons are immediately attracted to the positive charges due to the mutual Coulomb forces of attraction between opposite electric charges. When an electron moves sufficiently close to a positive charge in the p region, the two charges 're-combine'.

Each time an electron recombines with a positive charge, electric potential energy is converted into electromagnetic energy. For each recombination of a negative and a positive charge, a quantum of electromagnetic energy is emitted in the form of a photon of light with a frequency characteristic of the semi-conductor material (usually a combination of the chemical elements gallium, arsenic and phosphorus). Only photons in a very narrow frequency range can be emitted by any material. LED's that emit different colors are made of different semi-conductor materials, and require different energies to light them. web emitting diodes, commonly called LEDs, are real unsung heroes in the electronics world. They do dozens of different jobs and are found in all kinds of devices. Among other things, they form the numbers on digital clocks, transmit information from remote controls, light up watches and tell you when your appliances are turned on.

Collected together, they can form images on a jumbo television screen or illuminate a traffic light. Basically, LEDs are just tiny light bulbs that fit easily into an electrical circuit. But unlike ordinary incandescent bulbs, they don't have a filament that will burn out, and they don't get especially hot. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor. web Emitting Diode (LED) Therapy. htm led light therapy web light therapy. htm.