LED lighting economic hot, perhaps in order to break or summary, the lighting is divided into three eras:
A filament light bulb era (incandescent lamp)
Second, the gas bulb era (fluorescent)
Third, the semiconductor light-emitting era (led 1w )
Among these are the oldest incandescent and mainstream LED, the most important investigation. Regardless of the era is how the development of the lighting industry's production processes are surprisingly similar, nothing more than China as downstream in the industry. The core technologies are basically all other countries and regions as Europe, America and Japan.
1, the LED light-emitting principle, the electron passes through a layer of semiconductor material, the excitation of the semiconductor material that converts electrical energy into light. However, single-layer semiconductor light-emitting ability is very weak, so you want a lot of single layer materials together, and pressed into similar Lapis composite, which is the "wafer".
Therefore, the High Power LED 50W luminous efficiency depends on the same thickness, can be pressed into the layer. Single-layer material is thinner, more layers can be superimposed, the luminous efficiency is higher. The general thickness of each is only 2-20 microns, which also determines the production of epitaxial wafers is the most difficult part of the LED production process.
2, cutting - LED core: the equivalent of drawn filaments from tungsten materials, different yes, after cutting the wafer is a box-shaped.
Wafer special structure, want the intact and cut the core of the starting light, very difficult. Not only require a vacuum environment, but also the professional cutter. The world's only two manufacturers of this cutter.
3, the core into the LED chip: the chip in the LED As the lamp holder in light bulbs, the power supply part. "Chip" is a very important equipment to achieve the desired effect led power 50w because the LED current is very high.
4 package LED chips into light: the led power 10w chip package as the luminous body, as to the filament lamp holder with lamp shade made bulb. Lampshade shape basis may require different packaging technology determines the service life of the luminous body.
Lighting applications: Just like the use of incandescent light bulbs the same, according to the different functions and needs to be assembled into a variety of LED products.
led 10w for the first three steps of the wafer, cut and chip the upstream package in the fourth step is the middle reaches, the fifth step of the application is downstream. These problems we need to use more energy to break through.