Circuit White LED Lamp

Circuit White LED Lamp

LED (light emitting diode) is now widely used, among other things, traffic signal lights and indicator lights of the vehicle. Efisasi value (lumens per watt) LED growing makes this light source is used extensively in the field of lighting.

Embryo of LED lights for lighting LEDs inseparable from the emergence of the first time on the market in the 1960s. Red LED is an LED type which first appeared on the market, followed by the type of LED is yellow and orange.

The presence of LEDs in the market is the emergence of a new type of lighting with low electricity consumption compared with conventional light and very little heat generated. After a long LED accepted by society and then came the idea to make a lamp using white LEDs.

Layout White LED Lamp

The desire to make LEDs that produce white light must be supported by the discovery of a blue LED. The reason for this is because white light produced by LEDs can produce light by combining red, green, and blue of each LED. To meet these needs, we perform research on materials that are capable of producing LED blue.

The development of research in the field of material science has helped the discovery of a blue LED. Evident in 1993, Shuji Nakamura at Nichia Chemical Industries shows the invention of blue LED using gallium nitride material (GaN). These findings led the creation of white light LED lamps as well as the manufacture of LEDs for lighting in the indoor and outdoor.

The process of combining light from blue LEDs, red, and green to produce LEDs that emit white light when it began to rarely used. The majority of current white LED light generated by the structure of InGaN-GaN (indium gallium nitride, gallium nitride).

InGaN active layer of sediment covered by a yellowish phosphor which is usually made of cerium crystal of yttrium aluminum didop by garnet (Ce3 +: YAG). When the LED chip emits blue light, then when it also emerged the spectrum at a wavelength of about 580 nanometers is yellow produced by the Ce3 +: YAG. Since yellow light stimulates the red and green receptor cells in the human eye, then the mixture of blue and yellow produce light that looks white. Mechanical manufacture of white LEDs in this way has been developed by Nichia since 1996 to produce white light LEDs.

Current methods used to produce white light LEDs is not based or involve the whole of phosphorus, but by basing on the growth of zinc selenida (ZnSe) on a ZnSe substrate (in homoepitaksial). Architectural be homoepitaksial ZnSe like that can produce blue light from its active area and emits a yellow light from the substrate. This technique produces yellowish-white light similar to incandescent light produced.