How to Improve White SMD Package Yields Can Effectively Reduce Production Costs

LED Engineering roundup with the package form of pluralistic development, more and more enterprises SMD LED package , competition is relatively intense. The raw materials used by the various companies in the industry are more or less the same, the difference is not gold wire , chip , glue, phosphor , such as stents, the prices are relatively transparent. Then, in the fierce competition in the market in order to earn a little small profit margins, key depends on "internal strength" shades of white light package engineers enterprises , the selection of raw materials and with particularly important.
About raw materials, the same batch of LED chips, and some corporate yield can only do 80% (20% of the BIN foreign goods), some companies are able to do 90% yield, the difference is very large, the yield of determines the level of increase or decrease of the final cost of the consignment. Many factors affect the yield, such as the viscosity of the silica gel and the particle size of the phosphor uniformity, etc. has a different effect, the viscosity is too low, the glue with the larger particles of the phosphor in the production process consistency is difficult to be controlled, prone to a lot of the BIN the outer product will increase the waste of raw materials to raise the overall cost of production. If the calculation of the total production costs (needed for the production of all raw materials costs and staff salaries, electricity and other costs), down this consignment production result is definitely a big loss. SMD3528 package, for example, if the yield is increased by 5%, the number of the yield and then do 1KK large cargo will increase to 50,000 lights in line with customer requirements, the market price of 50,000 lights total about 7000-10000 yuan or so. That is, if the yield in the production process has not been effectively improved, a loss of this value, thereby increasing the cost of production.
Improve white SMD yield in phosphor selection is very important, you need to select the phosphors suitable for SMD package dedicated , so with a the SMD package special glue to be able to make a perfect product. Imported phosphor prices and domestic phosphor price difference of nearly 1,000 yuan / 100 grams. Domestic phosphor cheap, but production and production yield is not high, from the price point of view of the surface to be able to reduce costs, in fact, ultimately increase the total cost of production, the above example illustrates this problem. Imported phosphor production technology is more mature and stable, is gaining the favor of the majority of white SMD manufacturers, such as Hongdae introduced H102, H132 (H102 is the upgraded version of the original old models of 00902, H132 is the original old models of 432 upgrade version), these two phosphor particle size 13um, particle size in the middle with moderate viscosity glue (such as: Shin-Etsu, 1018), coupled with strict control on made ​​to improve the yield change very easy. If this calculated, to improve the yield of the phosphor Although a little expensive, but the cost of the entire process over to count, may still be imported phosphor lower cost, better for companies to create more profit margins.
Phosphor for phosphor for white engineers are misread. Not the larger particles phosphor the higher light efficiency, large phosphor particles requires a wavelength corresponding to large size blue chip excited to be able to play the best results. Larger phosphor particles suitable for high-power aspects of the package , because the high power LED corporate general monthly production capacity is not very high, the overall effect looks very different. SMD on different enterprises are generally put into operation on KK-class production, can only improve the yield increase its shipping rates to maximize profits.