The Beginning of the LED Light Bulb

The LED is a light source which uses electroluminescence and semiconductors to create light. There are two major kinds of light emitting diodes: LED and OLED. The LED is diverse that of the EL lamp in that it uses a small semiconductor crystal with reflectors and other parts to make the light focused and brighter into a particular point. The OLED is very similar to the EL lamp in design, using a flat sandwich of resources. It is different than the EL lamp and LED in that it uses organic carbon molecules in the level that emits light.

At present the LED lamp is prevalent due to its adeptness and many believe it is a 'new' technology. The LED as we know it has been around for over 50 years. The recent growth of white LEDs is what has brought it into the public eye as a replacement for additional white light sources.

LEDs create light by electroluminescence in a semiconductor material. Electroluminescence is the phenomenon of a material emitting light when electric current or an electric field is travelling through it, this occurs when electrons are sent through the material and fill electron holes. An electron hole subsists where an atom absences electrons or is negatively charged and therefore has a positive charge. Semiconductor materials like germanium or silicon can be "doped" to produce and control the number of electron holes. Doping is the accumulation of other elements to the semiconductor material to change its properties. By doping a semiconductor you can make two isolated types of semiconductors in the same crystal. The margin between the two types is called a p-n junction. The junction only permits current to pass through it one way; this is why they are used as diodes. LEDs are made using p-n junctions. As electrons pass through one crystal to the other they fill the electron holes. They emit light (otherwise known as photons). This is also how the semiconductor laser works.

Phosphors are used to help screen the light output of the LED. They produce a more pure harsh colour. Engineers had to figure out how to control the angle the light escapes the semiconductor, this light cone is very fine. They figured out how to make light divert or bounce off all surfaces of the semiconductor crystal to strengthen the light output. This is why LED displays have usually been best observed from one angle.

If you are in need of LED's or any type of lighting for your home or business then please do not hesitate to contact Sunfor Technologies for more information.

 

Source : articlesbase.com