Light Emitting Diode

In light emitting diode physics the recombination of electrons and electron holes in a semiconductor produce light or infrared radiation a process called electroluminescence the wavelength of the light produced depends on the energy band gap of the semiconductors used.

Light emitting diode. Multi colour light emitting diode. The light emitting diode or led as it is more commonly called is basically just a specialised type of diode as they have very similar electrical characteristics to a pn junction diode. A light emitting diode led is an optical semiconductor device that emits light. They form 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.

It consists of a pn junction diode and when voltage is applied to the led electrons and holes recombine in the pn junction and release energy in the form of light photons. In 1962 nick holonyak has come up with an idea of light emitting diode and he was working for the general electric company. Since these materials have a high index of refraction design features of the devices such as special optical coatings. Electrons in the semiconductor recombine with electron holes releasing energy in the form of photons the color of the light corresponding to the energy of the photons is determined by the energy required for electrons to cross the band gap of the semiconductor.

Light emitting diodes emit either visible light or invisible infrared light when forward biased. The light emitting diode is a two lead semiconductor light source. The leds which emit invisible infrared light are used for remote controls. There are large numbers of leds available in the market with varying shapes and sizes different colours and different light output intensities.

The led is a special type of diode and they have similar electrical characteristics of a pn junction diode. Gallium arsenide phosphide red colored led with the diameter of 5 mm is the most commonly used led and it is very cheap to produce. This means that an led will pass current in its forward direction but block the flow of current in the reverse direction. Warna warna cahaya yang dipancarkan oleh led tergantung pada jenis bahan semikonduktor yang dipergunakannya.

Pengertian led light emitting diode dan cara kerjanya light emitting diode atau sering disingkat dengan led adalah komponen elektronika yang dapat memancarkan cahaya monokromatik ketika diberikan tegangan maju. Light emitting diodes commonly called leds are real unsung heroes in the electronics world they do many different jobs in all kinds of devices. The light is not particularly bright but in most leds it is monochromatic occurring at a single wavelength. Light emitting diodes with.

A light emitting diode led is a semiconductor light source that emits light when current flows through it. Basics of led light emitting diode as mentioned in the introduction an led is a semiconductor light source.