What raw material does LED light source use?
In general, the growth of GaN requires very high temperatures to break the bond of NH3's N-H. On the other hand, it is also shown by dynamics simulations that NH3 and MO Gas react to produce no volatile by-products.LED epitaxial wafer process is as follows:Substrate structure design buffer layer growth N type GaN layer growth multi quantum well luminescence layer growth P type GaN layer growth annealing detection (photoluminescence, X ray) epitaxial sliceEpitaxial wafers - design, processing, mask - lithography - ion etching - N electrodes (coating, annealing, etching) - P electrodes (coating, annealing, etching) - dicing - chip classification, grading
In the past ten years, in order to develop blue high brightness LED, researchers from all over the world have devoted themselves to it. The commercialization of products such as blue and green light emitting diodes, two stage tubes, LED and laser two stage tube LD applications all illustrate the potential of III - V elements. In the current commercial LED materials and technology extension, red and green light emitting diodes are mainly epitaxy growth method of liquid phase epitaxy, and yellow, orange light emitting diode is still in vapor phase epitaxial growth method to grow P GaAs GaAsP materials.
LED (Light, Emitting, Diode) light emitting diode (LED) is a solid semiconductor device that converts electric energy into visible light. It can directly convert electricity into light. The heart of LED is a semiconductor wafer, one end of which is attached to a bracket, one end is negative, and the other is connected to the positive electrode of the power to encapsulate the entire wafer with epoxy resin. Semiconductor wafers consist of two parts, one is P type semiconductor, in which the hole dominates, and the other end is N type semiconductor, which is mainly electronic here. But when the two semiconductors are connected, they form a "P-N" junction". When the current passes through the wire acting on the chip, the electrons are pushed into the P region. In the P region, electrons combine with the hole and then emit energy in the form of photons, which is the principle of LED luminescence. The wavelength of light, that is, the color of light, is determined by the material that forms the P-N junction. The utility model relates to a display screen for displaying text, graphics, pictures, animation, prices, video, video signals and other information by controlling the display way of a semiconductor led. It has many advantages, such as easy to control, low voltage DC drive, rich color combination, long service life and so on. It is widely used in city projects and large screen display systems. LED can be used as a display, under computer control, to display video and pictures of varying colors. LED is a semiconductor that transforms electrical energy into visible light.
