Tuesday, 23 June 2015

LED or light emitting diode


LED is a light emitting diode (Light Emitting Diode, LED) for short, also known as light-emitting diodes, the semiconductor component is generally used as the indicator, a display panel, which not only can efficiently direct contact Mitutoyo photovoltaic electrical energy into light energy, while the operating voltage is low (some only a little over volts).

And have the most up to tens of thousands of hours to 100,000 hours of life, but have not as conventional bulbs fragile, and the advantages of energy saving.

It is a semiconductor diode that can put energy into light energy; often abbreviated is an LED. Like ordinary diode emitting diode is a PN junction composed, also with unidirectional conductivity. When coupled to the light emitting diode forward voltage, injected into the holes from the P region and the N zone area by the N electrons injected into the P region, near the PN junction within a few microns were empty and Electronics and P region of the N region Point complex, resulting in the spontaneous emission of fluorescence. Energy states of electrons and holes which are different in different semiconductor materials. When an electron and hole recombination energy released somewhat different, more energy released, the shorter the wavelength of light is emitted. Commonly used hair red, green or yellow light diode.