![active low cathode led active low cathode led](https://www.robotgear.com.au/Cache/Files/ProductImageOriginals/4164_LED_RGB_Clear_Common_Cathode_6.jpg)
Red or yellow light is produced by using Gallium-Arsenide-Phosphorus (GaAsP) as a semiconductor. Infrared light is produced by using Gallium Arsenide (GaAs) as a semiconductor. Hence, light emitted by the device depends on the type of semiconductor material used. The farther these orbitals are apart from each other, the greater the intensity of the emitted light.ĭifferent wavelengths involved in the process determine the different colors produced from the LEDs. In response to the P-type of doping, electrons in LEDs move by falling from the higher orbitals to the lower ones releasing energy in the form of photons i.e. In LEDs, the above phenomena is well exploited.Conversely, if the electrons are made to fall from the higher to the lower orbitals, logically energy should be released in the process.
![active low cathode led active low cathode led](https://www.autobotic.com.my/image/autobotic/image/cache/data/all_product_images/product-8882/4008-2-700x700.jpg)
We know that to make an electron shoot from lower orbital to higher orbital its energy level is required to be lifted.From the above explanation, it’s clear that the intensity of light emitted from a source (LED in this case) will depend on the energy level of the emitted photons which in turn will depend on the energy released by the electrons jumping in between the atomic orbits of the semiconductor material.Due to the virtue of the semiconductor property, current will never travel in opposite directions in the respective cases. Thus in the influence of an electric current in N-type of material, the electrons are able to travel from anode (positive) to the cathode (negative) and vice versa in the P-type of material. In both ways the material is rendered more conductive. These impurities in the form of additional atoms are able either to provide free electrons (N-type) into the system or suck out some of the already existing electrons from the atoms (P-Type) creating “holes” in the atomic orbits.By adding an impurity, which is known as doping, extra atoms are introduced, effectively disturbing the balance of the material.Without free electrons, conduction of electricity becomes impossible here. In its original state, the atoms of this material are strongly bonded. The material used in LEDs is basically aluminum-gallium-arsenide (AlGaAs).This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. It is a p–n junction diode that emits light when activated. See what our Students have to say about usĪ light-emitting diode is a two-lead semiconductor light source. The two terminals (anode and cathode) of a LED when connected to a voltage source in the correct polarity, may produce lights of different colors, as per the semiconductor substance used inside it. It’s quite comparable to the normal general purpose diode, with the only big difference being its capability to emit light in different colors. The magnificent, beautiful, dazzling colors involved with LEDs may be quite picturesque, but do you really know how these effects are actually created in them or rather how do LED light bulbs work?Īs is evident from its name, LED (Light Emitting Diode) is basically a small light emitting device that comes under “active” semiconductor electronic components. Specifically, LEDs are very small in size and consume very little power. Today their popularity and applications are increasing rapidly due to some remarkable properties they have. From your cell phone to the large advertising display boards, the wide range of applications of these magical light bulbs can be witnessed almost everywhere. A Light Emitting Diode (LED) is one of the latest inventions and is extensively used these days.