Long LEDs have entered into our daily lives. Because of their many advantages, they increasingly supplant other light sources such as light bulbs, energy saving light bulbs or halogen lamps. While they are very different from all previously used light sources. But how do LEDs actually work?
The letter LED stand for light emitting diodes (semiconductor) and are based on the production of light from crystals.
The ability of semiconductor compounds to give light when a voltage is applied, 1907 by the English Explorer Henry Joseph Round was discovered. First no greater importance was attached to this finding, however, so it should last until the development of the first (red) LED by Nick Holonyak, who is considered the inventor of the light-emitting diodes, until the year 1962. From the 1970s onwards LEDs were available then in green, Orange and yellow, 20 years in blue. 1995 was developed the first white LED, which is since 2000 in various devices.
The Principle Behind The LED Technology
LEDs consist of a semiconductor crystal with two interchanges, an anode (+) and cathode (-).For a good electrical conductivity, are foreign atoms with electron surplus brought in a layer of Crystal foreign atoms with electron deficiency, in the other, the n-layer. The atoms with electron deficiency comes from the boron group consists/Borgruppe. If you for example to the elements gallium or aluminium. You are combined with elements of nitrogen-phosphorus group, which have an excess of electrons.
How BB´S Works
The top of the Crystal is connected to the anode through a thin wire. Current in the direction of the river flows through the LED “p” Hiking the freely moving, conductive surplus electrons directly from “n” to the region of lack of. There, they fill the gaps of the acceptors and recombine with the positively charged atoms. This released energy is emitted as light. This light escapes the following through the p-type layer, where the light intensity increases proportional to the current. Depending on, how much is the difference of energy levels between electron donors and-Nehmern, the light for us has a specific color.
Light-Emitting Diodes-The Technology Makes The Added Value
Because this process almost all of the energy in the form of light emitted, no heat is produced as it is of other lamps. This increases their life span. At the same time, the energy consumption is reduced thanks to the optimal power use. So, you can save up to 90% of energy costs with modern LEDs.