Generally there are three kinds of materials available in the market can be used as a substrate: sapphire (Al2O3), silicon (Si), silicon carbide (Sic). Which is the most used sapphire substrate material Shandong days Yue energy and new materials, with the production technology is mature, better device quality, good stability, high mechanical strength, easy handling and cleaning and so on. But it also has many disadvantages can be overcome: first, the lattice mismatch and thermal mismatch stress will result in a large number of defects in the epitaxial layer, also causing difficulties for subsequent processing devices; the second, sapphire is an insulator, the resistivity is large, vertical structure of the device can not be made; the third, usually only on the N-type epitaxial layer produced on the surface and the P-type electrode, resulting in the effective light emitting area is reduced, lowering the material utilization; fourth, the hardness of sapphire is very high, only inferior to the diamond, it is difficult to carry out thinning and cutting; fifth, sapphire thermal performance is not very good, so the use of semiconductor lighting devices, a lot of heat will be conducted on larger high-power devices, thermal performance A very important consideration. In order to solve the above problems, improve thermal and electrical conductivity properties of LED devices, more and more companies began to use in optoelectronic devices in silicon carbide or silicon substrates. Crystal Materials Co., Ltd. Shandong days Yue, domestic companies in such substrate material on the development and processing have made no small progress. Popular terms, the semiconductor layer and the semiconductor laser, LED light emitting section, the growth of crystals is formed on the substrate. Depending on the substrate used in the LED light emission wavelength and selectively used. If a blue LED and white LED, a GaN-based LED chip of semiconductor material, using sapphire, SiC and Si or the like as a substrate, if it is a red LED such as the use of LED chip AlInGaP-based material, such as GaAs is used as the substrate. A reason for LED emission wavelength is used in order to select a different substrate with the LED light emitting part - of the semiconductor crystal lattice constant as close to the lattice constant of the low-cost substrate materials. This gap between the lattice constant (lattice mismatch) will be reduced, the possibility of disturbing light emission of crystalline defects in the semiconductor layer will be reduced. But also to reduce the unit price of LED chips. Further, the current density and optical output denser blue-violet semiconductor laser element, the use of expensive GaN substrate. GaN substrates are also used part of the blue LED. In recent years, in order to increase the light extraction Shandong days after Yue saving materials from the LED chip, the semiconductor crystal layer formed on the substrate, the substrate to be posted on the other substrate technology has been in practical use. When pasted onto another board set up a light reflective layer interface Shandong days Yue, the semiconductor crystal layer. A reflective layer having a light emitting layer toward the substrate side of the reflective light, it is extracted to the surface side of the LED effect. In addition to the red LED has been used, but recently the blue LED, GaN-based semiconductor LED chip also expanded adoption. GaN-based semiconductor material using an LED as well as not to post the substrate, so that it remains in a state of peeling method. These methods are more effective on the larger dimensions of the LED chip. There is a large-sized chip in the chip occurs off-chip when the light exit optical path becomes long, resulting in a problem of light attenuation occurs in the process. This problem can be solved by posting board. Shandong days Yue energy and new materials, Shandong days Yue, energy-saving materials provided by Jinan Spark Technology Development Company Limited. Jinan Spark Technology Development Co., Ltd. (www.sicc.cc) (http://www.sicc.cc) strong, credible, in Jinan, Shandong chemical equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shandong days into the glorious mountain and you work for a better future! You can also access (www.sicc.cc/supply_details_42194585.html), for more information about the company.