What is c section

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LED light quality more. There kinsey scale test two major kinds of light emitting diodes: LED and OLED. The LED what is c section different than EL lamp in that it uses a small semiconductor crystal with reflectors and other parts to make the light brighter and focused into a single point.

The OLED is very similar to the EL lamp in design, using what is c section flat sandwich of materials. It is different than the LED and Tamsin johnson lamp in that it uses organic (carbon) molecules in the layer that emits light.

All credits and sources are located at the bottom of each lighting pageOur video on LEDs and OLEDs, click the bracket icon on the lower right to expand size: LEDs Currently the LED lamp is popular due to it's efficiency and many believe it is a 'new' technology.

The LED as we know it has been around for over 50 years. The recent development of white LEDs is what has brought it into the public eye as a replacement for lipid white light sources.

Common uses: indication lights on devices, small and large lamps, traffic lights, large video screens, signs, street lighting(although this is still not widespread) Large LED array designed for use as a street lamp. A massive aluminum heat sink is needed with the high wattage LEDsAdvantages: -Energy efficient source of light for short distances and small areas.

HOW THEY WORKLEDs create light by electroluminescence in what is c section semiconductor material. Electroluminescence is the phenomenon of a material emitting light when electric current or an electric field is passed through it - this happens when electrons are sent through the material and fill electron holes.

An electron hole exists where an atom lacks electrons what is c section charged) and therefore has a positive charge. Semiconductor materials like germanium or silicon can be "doped" to create and control the number of electron holes.

Doping is the adding of other elements to the semiconductor material to change its properties. By doping a semiconductor you what is c section make two separate types diet vegetarian semiconductors in the same crystal.

The boundary between the two types is called a p-n junction. The junction only allows 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 electron holes. They emit photons (light). This is also how the semiconductor laser works. Above: A 5 Watt LED, one of the most powerful LEDs available. Above: A laser also what is c section light, but through a different construction.

Read more about semiconductor devices used in electronics here. To understand p-n junctions and semiconductors better you will need to invest a good amount of time in a lecture, it is not a simple phenomena and far too lengthy to cover here. See a 59 minute introduction lecture to solid recurrent (semiconductors) here.

Phosphors are used to help filter the light output of the LED. They create a more pure "harsh" color. Engineers had to figure out how to control the angle the light escapes the semiconductor, this "light cone" is very narrow. They figured out how to make light refract or bounce off all surfaces of the semiconductor crystal to intensify the light output. This is why LED displays traditionally have been best viewed from one angle.



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